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Abstract

The main reason of a cavitational destruction is the mechanical action of cavitation pulses onto the material’s surface. The course

of cavitation destruction process is very complex and depends on the physicochemical and structural features of a material. A resistance

to cavitation destruction of the material increases with the increase of its mechanical strength, fatigue resistance as well as hardness.

Nevertheless, the effect of structural features on the material’s cavitational resistance has been not fully clarified. In the present paper,

the cavitation destruction of ZnAl4 as cast alloy was investigated on three laboratory stands: vibration, jet-impact and flow stands.

The destruction mechanism of ZnAl4 as cast alloy subjected to cavitational erosion using various laboratory stands is shown in the present

paper.

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Authors and Affiliations

R. Jasionowski
D. Zasada
W. Polkowski
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Abstract

This paper presents selected applications of the miniaturized hydraulic components offered by specialized manufacturers and some results of the authors' own research on microflows, including results of hydraulic microfeeder vibration measurements performed by the touchless method using a laser vibrometer. The latter was chosen in order to eliminate measuring instrument influence on the investigated microhydraulic object. Special attention was focused on acoustic problems: noise sources and methods of noise reduction.

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Authors and Affiliations

Wacław Kollek
Zygmunt Kudźma
Janusz Rutański
Michał Stosiak
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Abstract

Ultrasonic emulsifying processes of immiscible liquids can be used to obtain stable emulsions. The authors used an ultrasonic sandwich head with an energy concentrator to obtain a suitable value of the energy density necessary for the emerge of ultrasonic cavitation. Two piezoelectric ring (Dext = 50 mm) transducers of Pz-26 type produced by FERROPERM were used to design the ultrasonic sandwich head. The frequency of the ultrasonic wave was 18.4 kHz and the excitation time of the ultrasonic transducer exiting 5 minutes. Visible bubbles during the generation of ultrasonic waves appeared in the mixture after exceeding the cavitation threshold. The authors determined also the cavitation threshold by measuring the electrical voltage conducted to the transducers. To receive long-lasting emulsion, the electrical voltage attained 300 Vpeak. The dispersion dependence on the emulsifying time was determined. The emulsion of linseed oil and water was stable through some months without surfactants.
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Authors and Affiliations

Andrzej Skumiel
Arkadiusz Józefczak
Krzysztof Heller
Tomasz Hornowski
Katarzyna Wielgusz
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Abstract

Condition monitoring in a centrifugal pump is a significant field of study in industry. The acoustic method offers a robust approach to detect cavitations in different pumps. As a result, an acoustic-based technique is used in this experiment to predict cavitation. By using an acoustic technique, detailed information on outcomes can be obtained for cavitation detection under a variety of conditions. In addition, various features are used in this work to analyze signals in the time domain using the acoustic technique. A signal in the frequency domain is also investigated using the fast Fourier method. This method has shown to be an effective tool for predicting future events. In addition, this experimental investigation attempts to establish a good correlation between noise characteristics and cavitation detection in a pump by using an acoustic approach. Likewise, it aims to find a good method for estimating cavitation levels in a pump based on comparing and evaluating different systems.
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Authors and Affiliations

Ahmed Ramadhan Al-Obaidi
1
ORCID: ORCID

  1. Faculty of Engineering, Department of Mechanical Engineering, Mustansiriyah University, Baghdad, Iraq
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Abstract

The focus of research works on cavitation has changed since the 1960s; the behaviour of a single bubble is no more the area of interest for most scientists. Its place was taken by the cavitating flow considered as a whole. Many numerical models of cavitating flows came into being within the space of the last fifty years. They can be divided into two groups: multifluid and homogeneous (i.e., single-fluid) models. The group of homogenous models contains two subgroups: models based on transport equation and pressure based models. Several works tried to order particular approaches and presented short reviews of selected studies. However, these classifications are too rough to be treated as sufficiently accurate. The aim of this paper is to present the development paths of numerical investigations of cavitating flows with the use of homogeneous approach in order of publication year and with relatively detailed description. Each of the presented model is accompanied by examples of the application area. This review focuses not only on the list of the most significant existing models to predict sheet and cloud cavitation, but also on presenting their advantages and disadvantages. Moreover, it shows the reasons which inspired present authors to look for new ways of more accurate numerical predictions and dimensions of cavitation. The article includes also the division of source terms of presented models based on the transport equation with the use of standardized symbols.

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Authors and Affiliations

Agnieszka Niedźwiedzka
Günter H. Schnerr
Wojciech Sobieski
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Abstract

Analysis of a crystallographic texture (a preferred orientation) effect on cavitation wear resistance of the as-cast CuZn10 alloy, has been conducted in the present paper. The experiment was conducted on the CuZn10 alloy samples with <101>//ND or <111>//ND preferred orientations (where the ND denotes direction that is perpendicular to the exposed surface). The cavitation resistance examinations have been carried out on three different laboratory stands (namely, vibration, jet-impact and flow stands) that are characterized by a various intensity and a way of cavitation’s excitement. Obtained results point towards a higher cavitation resistance of the CuZn10 alloy with the <111> // ND preferred orientation.
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Authors and Affiliations

W. Polkowski
R. Jasionowski
D. Zasada
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Abstract

The highly dynamic and unsteady characteristics of the cavitating flow cause many negative effects such as erosion, noise and vibration. Also, in the real application, it is inevitable to neglect the dissolved air in the water, although it is usually neglected in the previous works to reduce the complexity. The novelty of the present work is analysing the impact of dissolved air on the average/unsteady characteristics of Venturi flow by conducting sets of experimental tests. For this purpose, two different amounts of dissolved air at five pressure levels (i.e. five different sets of cavitation numbers) were considered in the study of cavitating flow inside a Venturi nozzle. The fast Fourier transform analysis of pressure fluctuations proved that the shedding frequency reduces almost by 50% to 66%, depending on the case, with adding the amount of dissolved air. However, the reduction of 14% to 25% is achieved by the vibration transducers. On the other hand, the cavity enlarges as well as bubbly flow is observed in the test chamber at a higher level of dissolved air. Furthermore, it is observed that the re-entrant jet, as the main reason for the cavity detachment, is more effective for the detachment process in cases with a lower level of dissolved air, where the re-entrant jet front penetrates more toward the leading edge.
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Authors and Affiliations

Emad Hasani Malekshah
1
Włodzimierz Wróblewski
1
Krzysztof Bochon
1
Mirosław Majkut
1
Krzysztof Rusin
1

  1. Silesian University of Technology, Department of Power Engineering and Turbomachinery, Konarskiego 18, 44-100 Gliwice, Poland
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Abstract

The pump performance and occurrence of cavitation directly depends on different operating conditions. To cover a wide range of operation conditions for detecting cavitation in this work, investigations on the effect of various suction valve openings on cavitation in the pump were carried out. In order to analyse various levels of cavitation in different operation conditions, the effect of the decrease in the inlet suction pressure of the centrifugal pump by controlling the inlet suction valve opening was investigated using this experimental setup. Hence, the acoustic and pressure signals under different inlet valve openings and different flow rates, namely, 103, 200, 302 l/min were collected for this purpose. A detailed analysis of the results obtained from the acoustic signal was carried out to predict cavitation in the pump under different operating conditions. Also, the acoustic signal was investigated in time domain through the use of the same statistical features. The FFT technique was used to analyse the acoustic signal in the frequency domain. In addition, in this work an attempt was made to find a relationship between the cavitation and noise characteristics using the acoustic technique for identifying cavitation within a pump.

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Authors and Affiliations

Ahmed Ramadhan Al-Obaidi
ORCID: ORCID
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Abstract

Cavitation is an essential problem that occurs in all kinds of pumps. This cavitation contributes highly towards the deterioration in the performance of the pump. In industrial applications, it is very vital to detect and decrease the effect of the cavitation in pumps. Using different techniques to analysis and diagnose cavitation leads to increase in the reliability of cavitation detection. The use of various techniques such as vibration and acoustic analyses can provide a more robust detection of cavitation within the pump. In this work therefore, focus is put on detecting and diagnosing the cavitation phenomenon within a centrifugal pump using vibration and acoustic techniques. The results obtained from vibration and acoustic signals in time and frequency domains were analysed in order to achieve better understanding regarding detection of cavitation within a pump. The effect of different operating conditions related to the cavitation was investigated in this work using different statistical features in time domain analysis (TDA). Moreover, Fast Fourier Transform (FFT) technique for frequency domain analysis (FDA) was also applied. Furthermore, the comparison and evaluation system among different techniques to find an adequate technique incorporating for accuracy and to increase the reliability of detection and diagnosing different levels of cavitation within a centrifugal pump were also investigated.

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Authors and Affiliations

Ahmed Ramadhan Al-Obaidi
ORCID: ORCID
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Abstract

Fouling is inevitable on the surfaces of industrial equipment, especially on heat-exchanging surfaces in contact with fluids, which causes water pollution and destroys the ecological environment. In this paper, a novel fouling-removal methodology for plate structure based on cavitation by multi-frequency ultrasonic guided waves is proposed, which can remove fouling on stainless steel plates. A numerical simulation method has been developed to study the acoustic pressure distribution on a steel plate. According to the simulation results, the distribution of sound pressure on the plate under triple-frequency excitation is denser and more prone to cavitation than in single-frequency cases and dual-frequency cases, which improves fouling removal rate. The stainless steel plate is immersed in water for the descaling experiment, and the results show that the fouling removal rates of three water-loaded stainless steel plates under different single-frequency excitation seem unsatisfactory. However, the multi-frequency excitation improves the descaling performance and the removal rate of fouling reaches 80%. This new method can be applied to the surface descaling of large equipment plates, which is of great significance for purifying water quality and protecting the ecological environment.
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Authors and Affiliations

Mingkun Huang
1
Shuo Jin
Gaoqian Nie
1
Xiaopeng Wang
1
Quanpeng Zhang
1
Yang An
1 2
Zhigang Qu
1 2
Wuliang Yin
3

  1. College of Electronic Information and Automation, Tianjin University of Science and Technology, Tianjin, China
  2. Advanced Structural Integrity International Joint Research Centre, Tianjin University of Science and Technology, Tianjin, China
  3. School of Electrical and Electronic Engineering, University of Manchester, Manchester, United Kingdom
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Abstract

Hydrodynamic disintegration of the activated sludge and foam results in organic matter transfer from the solid phase to the liquid phase. Hydrodynamic disintegration caused an increase of COD value in activated sludge and foam of 220 mgdm3 and 609 mgdm3 - respectively, besides the degree of disintegration increases to 38% and 47%- respectively- alter 30 minutes of disintegration. Hydrodynamic cavitation affects positively the degree of disintegration and rate of biogas production. Also addition of a part of digested sludge containing adapted microorganisms resulted in acceleration of the anaerobic process. Addition of disintegrated foam (20% and 40% of volume) to the fermentation processes resulted in an improvement in biogas production by about 173% and 195% respectively - in comparison to activated sludge without disintegration (raw sludge) and 142% and 161 % respectively - in comparison to activated sludge with a part of digested sludge (80% raw sludge + 20% digested sludge).
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Authors and Affiliations

Alicja Machnicka
Klaudiusz Grubel
Jan Suschka
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Abstract

Full-floating ring bearings are state of the art at high speed turbomachinery shafts like in turbochargers. Their main feature is an additional ring between shaft and housing leading to two fluid films in serial arrangement. Analogously, a thrust bearing with an additional separating disk between journal collar and housing can be designed. The disk is allowed to rotate freely only driven by drag torques, while it is radially supported by a short bearing against the journal. This paper addresses this kind of thrust bearing and its implementation into a transient rotor dynamic simulation by solving the Reynolds PDE online during time integration. Special attention is given to the coupling between the different fluid films of this bearing type. Finally, the differences between a coupled and an uncoupled solution are discussed.
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Bibliography

  1. M.C. Shaw and T.J. Nussdorfer, “An analysis of the full-floating journal bearing,” NACA, Tech. Rep. RM-E7A28a, 1947.
  2. C. Kettleborough, “Frictional experiments on lightly-loaded fully floating journal bearings,” Aust. J. Appl. Sci., vol. 5, pp. 211–220, 1954.
  3. J. Dworski, “High-speed rotor suspension formed by fully floating hydrodynamic radial and thrust bearings,” J. Eng. Gas Turbines Power, vol. 86, no. 2, pp. 149–160, 1964.
  4. M. Harada and J. Tsukazaki, “The steady-state characteristics of a hydrostatic thrust bearing with a floating disk,” J. Tribol., vol. 111, no. 2, pp. 352–357, Apr 1989, doi: 10.1115/1.3261921.
  5. M. Fischer, A. Mueller, B. Rembold, and B. Ammann, “Numerical investigation of the flow in a hydrodynamic thrust bearing with floating disk,” J. Eng. Gas Turbines Power, vol. 135, 2013, doi: 10.1115/1.4007775.
  6. S. Dousti and P. Allaire, “A thermohydrodynamic approach for single-film and double-film floating disk fixed thrust bearings verified with experiment,” Tribol. Int., vol. 140, p. 105858, Dec 2019.
  7. H. Engel, “Berechung der Strömung, der Drücke und Temperaturen in Radial-Axialbund-Gleitlagern mit Hilfe eines Finite-Elemente-Programms,” Ph.D. thesis, Universität Stuttgart, 1992.
  8. T. Hagemann, H. Blumenthal, C. Kraft, and H. Schwarze, “A study on energetic and hydraulic interaction of combined journal and thrust bearings,” in Proceedings of ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, no. GT2015‒43460, 2015, pp. 1–11.
  9. G.H. Jang, S.H. Lee, and H.W. Kim, “Finite ele- ment analysis of the coupled journal and thrust bearing in a computer hard disk drive,” J. Tribol., vol. 128, pp. 335–340, 2006, doi: 10.1115/1.2162918.
  10. G. Xiang, Y. Han, R. Chen, J. Wang, X. Ni, and K. Xiao, “A hydrodynamic lubrication model and comparative analysis for coupled microgroove journal-thrust bearings lubricated with water,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol., vol. 234, no. 11, pp. 1755–1770, Nov 2019.
  11. J.-C. Luneno, “Coupled vibrations in horizontal and vertical rotor-bearings systems,” Ph.D. thesis, Luleå University of Technology, 2010.
  12. C. Ziese, C. Daniel, E. Woschke, and H. Mostertz, “Hochlaufsimulation eines semi-floating gelagerten ATL-Rotors mit schwimmender Axiallagerscheibe,” in 14. Magdeburger Maschinen- bautage (24.–25.09.2019), Sep. 2019, pp. 105–112.
  13. H.G. Elrod, “A cavitation algorithm,” J. Tribol., vol. 103, no. 3, pp. 350–354, 1981.
  14. S. Nitzschke, E. Woschke, D. Schmicker, and J. Strackeljan, “Regularised cavitation algorithm for use in transient rotordynamic analysis,” Int. J. Mech. Sci., vol. 113, pp. 175–183, 2016.
  15. S. Nitzschke, “Instationäres Verhalten schwimmbuchsengelagerter Rotoren unter Berücksichtigung masseerhaltender Kavitation,” Ph.D. thesis, Otto-von-Guericke Universität Magdeburg, 2016.
  16. C. Daniel, “Simulation von gleit-und wälzgelagerten Systemen auf Basis eines Mehrkörpersystems für rotordynamische Anwendungen,” Ph.D. thesis, Otto-von-Guericke Universität Magdeburg, 2013.
  17. C. Ziese, E. Woschke, and S. Nitzschke, “Tragdruckund Schmierstoffverteilung von Axialgleitlagern unter Berücksichtigung von masseerhaltender Kavitation und Zentrifugalkraft,” in Magdeburger Maschinenbautage, 2017, pp. 312–323.
  18. A. Kumar and J.F. Booker, “A finite element cavitation algorithm,” J. Tribol., vol. 113, no. 2, pp. 279–284, 1991.
  19. “MAN turbochargers TCA series floating disk thrust bearing,” https://turbocharger.man-es.com/docs/default-source/ shopwaredocuments/tca-turbochargerf451d068cde04720bdc9b 8e95b7c0f8e.pdf, accessed: 2020‒10‒09.
  20. “KBB turbochargers ST27 series f loating disk thrust bearing,” https://kbb-turbo.com/turbocharger-product-series/ st27-series, accessed: 2020-10-09.
  21. C. Irmscher, S. Nitzschke, and E. Woschke, “Transient thermohydrodynamic analysis of a laval rotor supported by journal bearings with respect to calculation times,” in SIRM 2019 – 13th International Conference on Dynamics of Rotating Machines, 2019, pp. Paper–ID SIRM2019–25.
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Authors and Affiliations

Steffen Nitzschke
1
Christian Ziese
1
Elmar Woschke
1
ORCID: ORCID

  1. Institute of Mechanics, Otto-von-Guericke University, 39106 Magdeburg, Germany
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Abstract

This paper proposes a new, simple and an efficient method for methanol formation under the cavitation influence of hydrogen-peroxide using a dynamic cavitation reactor. The process involves the reaction of the generated hydroxyl radical with propanebutane gas (C3–C4) to form propyl and butyl radicals which decompose into methyl radicals and alkenes, followed by the subsequent yield of methanol (via the interaction of methyl-radical with hydroxyl radical). Technological process parameters employed in this investigation are quite achievable for industrial production.
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Authors and Affiliations

A. Tselischev
M. Loriya
A. Ijagbuji
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Abstract

The paper deals with susceptibility of nodular cast iron with ferritic -pearlitic matrix on cavitation erosion . Cavitation tests were carried out with the use of a cavitation erosion vibratory apparatus employing a vibration exciter operated at frequency of 20 kHz. The study allowed to determine the sequence of subsequent stages in which microstr ucture of cast iron in superficial regions is subject to degradation. The first features to be damaged are graphite precipitates. The ferritic matrix of the alloy turned out to be definitely less resistant to cavitation erosion compared to the pearlitic matrix component.

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Authors and Affiliations

A. Trytek
M. Tupaj
M. Mróz
A.W. Orłowicz
M. Radoń
M. Jacek
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Abstract

Ultrasonic processing in the cavitation mode is used to produce the composite materials based on the metal matrix and reinforcing particles of micro- and nano-sizes. In such a case, the deagglomeration of aggregates and the uniform distribution of particles are the expected effects. Although the particles can not only fragment in the acoustic field, they also can coagulate, coarsen and precipitate. In this paper, a theoretical study of processes of deagglomeration and coagulation of particles in the liquid metal under ultrasonic treatment is made. The influence of various parameters of ultrasound and dispersion medium on the dynamics of particles in the acoustic field is considered on the basis of the proposed mathematical model. The criterion of leading process (coagulation or deagglomeration) has been proposed. The calculated results are compared with the experimental ones known from the scientific literature.

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Authors and Affiliations

Olga Kudryashova
Alexander Vorozhtsov
Pavel Danilov
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Abstract

Polyester coatings are among the most commonly used types of powder paints and present a wide range of applications. Apart from its decorative values, polyester coating successfully prevents the substrate from environmental deterioration. This work investigates the cavitation erosion (CE) resistance of three commercial polyester coatings electrostatic spray onto AW-6060 aluminium alloy substrate. Effect of coatings repainting (single- and double-layer deposits) and effect of surface finish (matt, silk gloss and structural) on resistance to cavitation were comparatively studied. The following research methods were used: CE testing using ASTM G32 procedure, 3D profilometry evaluation, light optical microscopy, scanning electron microscopy (SEM), optical profilometry and FTIR spectroscopy. Electrostatic spray coatings present higher CE resistance than aluminium alloy. The matt finish double-layer (M2) and single-layer silk gloss finish (S1) are the most resistant to CE. The structural paint showed the lowest resistance to cavitation wear which derives from the rougher surface finish. The CE mechanism of polyester coatings relies on the material brittle-ductile behaviour, cracks formation, lateral net-cracking growth and removal of chunk coating material and craters’ growth. Repainting does not harm the properties of the coatings. Therefore, it can be utilised to regenerate or smother the polyester coating finish along with improvement of their CE resistance.
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Bibliography

  1.  A. Kausar, “Review of fundamentals and applications of polyester nanocomposites filled with carbonaceous nanofillers,” J. Plast. Film Sheeting, vol. 35, no. 1, pp. 22–44, Jan. 2019, doi: 10.1177/8756087918783827.
  2.  A. Krzyzak, E. Kosicka, and R. Szczepaniak, “Research into the Effect of Grain and the Content of Alundum on Tribological Properties and Selected Mechanical Properties of Polymer Composites,” Materials, vol. 13, no. 24, Art. no. 5735, Jan. 2020, doi: 10.3390/ma13245735.
  3.  A. Kausar, “High performance epoxy/polyester-based nanocomposite coatings for multipurpose applications: A review,” J. Plast. Film Sheeting, vol. 36, no. 4, pp. 391–408, Oct. 2020, doi: 10.1177/8756087920910481.
  4.  M. Winnicki, T. Piwowarczyk, and A. Małachowska, “General description of cold sprayed coatings formation and of their properties,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 66, no. 3, pp. 301–310, Jun. 2018.
  5.  L. Łatka, L. Pawłowski, M. Winnicki, P. Sokołowski, A. Małachowska, and S. Kozerski, “Review of Functionally Graded Thermal Sprayed Coatings,” Appl. Sci., vol. 10, no. 15, Art. no. 5153, Jan. 2020, doi: 10.3390/app10155153.
  6.  R. Kosydar et al., “Boron nitride/titanium nitride laminar lubricating coating deposited by pulsed laser ablation on polymer surface,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 56, no. 3, pp. 217–221, 2008.
  7.  T. Burakowski and T. Wierzchon, Surface Engineering of Metals: Principles, Equipment, Technologies. Boca Raton, Fla: CRC Press, 1998.
  8.  T. Hejwowski, Nowoczesne powłoki nakładane cieplnie odporne na zużycie ścierne i erozyjne (Modern wear and erosion resitant thermally deposited coatings). Lublin, Poland: Politechnika Lubelska (Lublin University of Technology), 2013. [Online]. Available: http://bc.pollub. pl/dlibra/docmetadata?id=4059.
  9.  Z.W. Wicks. Jr, F.N. Jones, S.P. Pappas, and D.A. Wicks, Organic Coatings: Science and Technology. John Wiley & Sons, 2007.
  10.  S. Biggs, C.A. Lukey, G.M. Spinks, and S.-T. Yau, “An atomic force microscopy study of weathering of polyester/melamine paint surfaces,” Prog. Org. Coat., vol. 42, no. 1, pp. 49–58, Jun. 2001, doi: 10.1016/S0300-9440(01)00147-3.
  11.  M. Oleksy et al., “Kompozycje modyfikowanych farb proszkowych. Cz. 1. Hybrydowe kompozycje poliestrowych farb proszkowych,” Polimery, vol. 63, no. 11– 12, pp. 762‒771, 2018, doi: 10.14314/polimery.2018.11.4.
  12.  M. Fernández-Álvarez, F. Velasco, and A. Bautista, “Effect on wear resistance of nanoparticles addition to a powder polyester coating through ball milling,” J. Coat. Technol. Res., vol. 15, no. 4, pp. 771–779, Jul. 2018, doi: 10.1007/s11998-018-0106-z.
  13.  M. Zouari, M. Kharrat, and M. Dammak, “Wear and friction analysis of polyester coatings with solid lubricant,” Surf. Coat. Technol., vol. 204, no. 16, pp. 2593–2599, May 2010, doi: 10.1016/j.surfcoat.2010.02.001.
  14.  I. Stojanović, V. Šimunović, V. Alar, and F. Kapor, “Experimental Evaluation of Polyester and Epoxy–Polyester Powder Coatings in Aggressive Media,” Coatings, vol. 8, no. 3, Art. no. 98, Mar. 2018, doi: 10.3390/coatings8030098.
  15.  K.V.S.N. Raju and D.K. Chattopadhyay, “Polyester coatings for corrosion protection,” in High-Performance Organic Coatings, A.S. Khanna, Ed. Woodhead Publishing, 2008, pp. 165–200. doi: 10.1533/9781845694739.2.165.
  16.  M. Szala and E. Kot, “Influence of repainting on the mechanical properties, surface topography and microstructure of polyester powder coatings,” Adv. Sci. Technol. Res. J., vol. 11, no. 2, pp. 159–165, Jun. 2017, doi: 10.12913/22998624/69680.
  17.  M. Walczak, D. Pieniak, and M. Zwierzchowski, “The tribological characteristics of SiC particle reinforced aluminium composites,” Arch. Civ. Mech. Eng., vol. 15, no. 1, pp. 116–123, Jan. 2015, doi: 10.1016/j.acme.2014.05.003.
  18.  M. Szala, L. Łatka, M.Walczak, and M.Winnicki, “Comparative Study on the Cavitation Erosion and Sliding Wear of Cold-Sprayed Al/ Al2O3 and Cu/Al2O3 Coatings, and Stainless Steel, Aluminium Alloy, Copper and Brass,” Metals, vol. 10, no. 7, Art. no. 7, Jul. 2020, doi: 10.3390/met10070856.
  19.  V. Caccese, K.H. Light, and K.A. Berube, “Cavitation erosion resistance of various material systems,” Ships Offshore Struct., vol. 1, no. 4, pp. 309–322, Apr. 2006, doi: 10.1533/saos.2006.0136.
  20.  T. Deplancke, O. Lame, J.-Y. Cavaille, M. Fivel, M. Riondet, and J.-P. Franc, “Outstanding cavitation erosion resistance of Ultra High Molecular Weight Polyethylene (UHMWPE) coatings,” Wear, vol. 328–329, pp. 301–308, Apr. 2015, doi: 10.1016/j.wear.2015.01.077.
  21.  N. Qiu, L. Wang, S. Wu, and D.S. Likhachev, “Research on cavitation erosion and wear resistance performance of coatings,” Eng. Fail. Anal., vol. 55, pp. 208–223, Sep. 2015, doi: 10.1016/j.engfailanal.2015.06.003.
  22.  S. Chi, J. Park, and M. Shon, “Study on cavitation erosion resistance and surface topologies of various coating materials used in shipbuilding industry,” J. Ind. Eng. Chem., vol. 26, pp. 384–389, Jun. 2015, doi: 10.1016/j.jiec.2014.12.013.
  23.  G.L. García et al., “Cavitation resistance of epoxybased multilayer coatings: Surface damage and crack growth kinetics during the incubation stage,” Wear, vol. 316, no. 1–2, pp. 124–132, Aug. 2014, doi: 10.1016/j.wear.2014.04.007.
  24.  M. Hibi, K. Inaba, K. Takahashi, K. Kishimoto, and K. Hayabusa, “Effect of Tensile Stress on Cavitation Erosion and Damage of Polymer,” J. Phys. Conf. Ser., vol. 656, no. 1, p. 012049, Nov. 2015, doi: 10.1088/1742-6596/656/1/012049.
  25.  G. Taillon, S. Saito, K. Miyagawa, and C. Kawakita, “Cavitation erosion resistance of high-strength fiber reinforced composite material,” IOP Conf. Ser. Earth Environ. Sci., vol. 240, no. 6, p. 062056, Mar. 2019, doi: 10.1088/1755-1315/240/6/062056.
  26.  N. Sheppard, “The Historical Development of Experimental Techniques in Vibrational Spectroscopy,” in Handbook of Vibrational Spectroscopy, American Cancer Society, 2006. doi: 10.1002/0470027320.s0101.
  27.  R.M. Silverstein et al., Spectrometric Identification of Organic Compounds, 8th Edition, 8th edition. Wiley, 2014.
  28.  W. Macek et al., “Profile and Areal Surface Parameters for Fatigue Fracture Characterisation,” Materials, vol. 13, no. 17, Art. no. 3691, 2020, doi: 10.3390/ma13173691.
  29.  “ISO 4287:1997. Geometrical Product Specifications (GPS) – Surface texture: Profile method – Terms, definitions and surface texture parameters,” International Organization for Standardization, Geneva, Switzerland, Norma, 1997.
  30.  A. Skoczylas, “Influence of Centrifugal Shot Peening Parameters on the Impact Force and Surface Roughness of EN-AW2024 Aluminum Alloy Elements,” Adv. Sci. Technol. Res. J., vol. 15, no. 1, pp. 71–78, Mar. 2021, doi: 10.12913/22998624/130511.
  31.  “ASTM G32-10: Standard Test Method for Cavitation Erosion Using Vibratory Apparatus,” ASTM International: West Conshohocken, Philadelphia, PA, USA, 2010.
  32.  M. Szala, M. Walczak, L. Łatka, K. Gancarczyk, and D. Özkan, “Cavitation Erosion and Sliding Wear of MCrAlY and NiCrMo Coatings Deposited by HVOF Thermal Spraying,” Adv. Mater. Sci., vol. 20, no. 2, pp. 26–38, Jun. 2020, doi: 10.2478/adms-2020-0008.
  33.  J. Steller, A. Krella, J. Koronowicz, and W. Janicki, “Towards quantitative assessment of material resistance to cavitation erosion,” Wear, vol. 258, no. 1, pp. 604–613, Jan. 2005, doi: 10.1016/j.wear.2004.02.015.
  34.  J. Steller, “International Cavitation Erosion Test and quantitative assessment of material resistance to cavitation,” Wear, vol. 233–235, pp. 51–64, Dec. 1999, doi: 10.1016/S0043-1648(99)00195-7.
  35.  B. Dybowski, M. Szala, T. J. Hejwowski, and A. Kiełbus, “Microstructural phenomena occurring during early stages of cavitation erosion of Al-Si aluminium casting alloys,” Solid State Phenom., vol. 227, pp. 255–258, 2015, doi: 10.4028/www.scientific.net/SSP.227.255.
  36.  J. Zhao, Z. Jiang, J. Zhu, J. Zhang, and Y. Li, “Investigation on Ultrasonic Cavitation Erosion Behaviors of Al and Al-5Ti Alloys in the DistilledWater,” Metals, vol. 10, no. 12, Art. no. 1631, Dec. 2020, doi: 10.3390/met10121631.
  37.  J. Lin, Z. Wang, J. Cheng, M. Kang, X. Fu, and S. Hong, “Effect of Initial Surface Roughness on Cavitation Erosion Resistance of Arc- Sprayed Fe-Based Amorphous/Nanocrystalline Coatings,” Coatings, vol. 7, no. 11, Art. no. 2000, Nov. 2017, doi: 10.3390/coatings7110200.
  38.  M. Szala, L. Łatka, M. Awtoniuk, M. Winnicki, and M. Michalak, “Neural Modelling of APS Thermal Spray Process Parameters for Optimizing the Hardness, Porosity and Cavitation Erosion Resistance of Al2O3‒13 wt% TiO2 Coatings,” Processes, vol. 8, no. 12, Art. no. 1544, Dec. 2020, doi: 10.3390/pr8121544.
  39.  J.C. Lindon, Encyclopedia of Spectroscopy and Spectrometry – 3rd Edition. 2010. [Online]. Available: https://www.elsevier.com/books/ encyclopedia-of-spectro scopy-and-spectrometry/lindon/978-0-12-803224-4 (Accessed: Feb. 24, 2021).
  40.  J.I. Haleem, “A Review of: Handbook of Near-Infrared Analysis,” Instrum. Sci. Technol., vol. 22, no. 3, pp. 283–285, Aug. 1994, doi: 10.1080/10739149408000456.
  41. Infrared Spectroscopy: Fundamentals and Applications. John Wiley & Sons, Ltd, 2004, doi: 10.1002/0470011149.ch3.
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Authors and Affiliations

Mirosław Szala
1
ORCID: ORCID
Aleksander Świetlicki
2
Weronika Sofińska-Chmiel
3

  1. Department of Materials Engineering, Faculty of Mechanical Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
  2. Students Research Group of Materials Technology, Department of Materials Engineering, Lublin University of Technology, ul. Nadbystrzycka 36, 20-618 Lublin, Poland
  3. Analytical Laboratory, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, pl. Maria Curie-Sklodowska 3, 20-031 Lublin, Poland
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Abstract

Topics of this article concern the study of the fundamental nature of the sonoluminescence phenomenon occurring in liquids. At the Institute of Electrical Power Engineering at Opole University of Technology the interest in that phenomenon known as secondary phenomenon of cavitation caused by ultrasound became the genesis of a research project concerning acoustic cavitation in mineral insulation oils in which a number of additional experiments performed in the laboratory aimed to determine the influence of a number of acoustic parameters on the process of the studied phenomenona. The main purpose of scientific research subject undertaken was to determine the relationship between the generation of partial discharges in high-voltage power transformer insulation systems, the issue of gas bubbles in transformer oils and the generated acoustic emission signals. It should be noted that currently in the standard approach, the phenomenon of generation of acoustic waves accompanying the occurrence of partial discharges is generally treated as a secondary phenomenon, but it can also be a source of many other related phenomena. Based on our review of the literature data on those referred subjects taken, it must be noted, that this problem has not been clearly resolved, and the description of the relationship between these phenomena is still an open question. This study doesn’t prove all in line with the objective of the study, but can be an inspiration for new research project in the future in this topic. Solution of this problem could be a step forward in the diagnostics of insulation systems for electrical Power devices based on non-invasive acoustic emission method.

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Authors and Affiliations

Marek Szmechta
Dariusz Zmarzły
Tomasz Boczar
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Abstract

A common problem encountered in hydraulic valves is a progressing deterioration of tightness of their water flow cutting-off seats. The seats are provided usually with a copper-alloy insert joined mechanically with cast-iron valve housing. The problem of unreliability of such joints can be solved by providing surface of the seat with a coating, deposited with the use of HVOF method and resistant to abrasive and cavitation wear. The tests were carried out for a sealing-draining seat insert made of CuZn39Pb2Al brass used to date and a specimen taken from the cast-iron valve housing which was the substrate for a plasma-sprayed coating of powder containing 86.1% Cr, 7.2% Ni, and 6.7% C. The coating, 345 ± 15 μm thick, was characterized with good quality of bonding with cast-iron substrate and high compactness of the material. The cavitation wear test on materials used in the study were carried out with the use of Vibra-Cell ultrasonic liquid processor (Sonics) equipped with a piezoelectric probe operating at the frequency of 20 kHz. Based on profilograms taken along a line crossing centers of cavitation craters, measurements of the height parameter Rt, and microscopic observations of surfaces it has been found that the coating plasma-sprayed onto substrate of nodular cast iron demonstrated higher resistance to cavitation compared to copper-alloy inserts used so far in cast-iron hydraulic valves. Cavitation craters on the material used typically for valve seats to date were more distinctly outlined and deeper compared to craters observed on the coating. Larger were also sizes of local tear-outs which resulted in larger difference between the peaks line and the valleys line.

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Authors and Affiliations

A.W. Orłowicz
M. Tupaj
M. Mróz
B. Kupiec
M. Jacek
M. Radoń

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