How to search?
advanced search

Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 5
items per page: 25 50 75
Sort by:

Partially transient one-dimensional thermal-flow model of a heat exchanger, upwind numerical solution method and experimental verification

Dariusz Kardaś Izabela Wardach-Święcicka Artur Grajewski
Archives of Thermodynamics | 2022 | vol. 43 | No 4 | 63-83 | DOI: 10.24425/ather.2022.144406
Keywords Heat exchanger mathematical modelling One-dimensional Mixed model Shell and tube
Download PDF Download RIS Download Bibtex

Abstract

Shell and tube heat exchangers are commonly used in a wide range of practical engineering. The key issue in such a system is the heat exchange between the hot and cold working media. An increased cost of production of these devices has forced all manufacturing companies to reduce the total amount of used materials by better optimizing their construction. Numerous studies on the heat exchanger design codes have been carried out, basically focusing on the use of fully time-dependent partial differential equations for mass, momentum, and energy balance. They are very complex and time-consuming, especially when the designers want to have full information in a full 3D system. The paper presents the 1D mathematical model for analysis of the thermal performance of the counter-current heat exchanger comprised of mixed time-dependent and time-independent equations, solved by the upwind numerical solution method, which allows for a reduction in the CPU time for obtaining the proper solution. The comparison of numerical results obtained from an in-house program called Upwind Heat Exchanger Solver written in a Fortran code, with those derived using commercial software package ASPEN, and those obtained experimentally, shows very good agreement in terms of the temperature and pressure distribution predictions. The proposed method for fast designing calculations appears beneficial for other tube shapes and types of heat exchangers.
Go to article

Authors and Affiliations

Dariusz Kardaś
1
Izabela Wardach-Święcicka
1
Artur Grajewski
2
  1. The Szewalski Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdansk, Poland
  2. HEXONIC Sp. z o.o., Warszawska 50, 82-100 Nowy Dwór Gdanski, Poland

Modified Hooke-Jeeves optimization of operating parameters for required slider speeds and displacements in a feeder slider-crank mechanism

Mehmet Ilteris Sarigecili Ibrahim Deniz Akcali
Archive of Mechanical Engineering | 2023 | vol. 70 | No 1 | 63-83 | DOI: 10.24425/ame.2022.144072
Keywords slider-crank dynamic model speed control Hooke-Jeeves method optimization
Download PDF Download RIS Download Bibtex

Abstract

In such applications as in the case of feeders in which a slider-crank mechanism equipped with a rotational spring on its crank is driven by a constant force and a lumped mass at the crank-connecting rod joint center, the slider is required to take on desired speeds and displacements. For this purpose, after obtaining and solving the dynamic model of the slider-crank mechanism, the output of this model is subjected to a modified Hooke-Jeeves method resulting in the development of a procedure for the optimization of selected set of operating parameters. The basic contribution involved in the so-called Hooke-Jeeves method is the procedure by which a cost-effective advancement towards a target optimum point is accomplished in a very short time. A user-friendly interface has also been constructed to support this procedure. The optimization procedure has been illustrated on a numerical example. The validation of the resulting dynamic model has also been demonstrated.
Go to article

Bibliography

[1] M.I. Sarigecili and I.D. Akcali. Design of a uniform ice cutting device. In Proceeding of the 2nd Cilicia International Symposium on Engineering and Technology (CISET 2019), pages 311–317, Mersin, Turkey, 10-12 October, 2019.
[2] İ.D. Akçalı and M.A. Arıoğlu. Geometric design of slider-crank mechanisms for desirable slider positions and velocities. Forschung im Ingenieurwesen, 75:61–71, 2011. doi: 10.1007/s10010-011-0134-7.
[3] M.I. Sarigecili and I.D. Akcali. Development of constant output-input force ratio in slider-crank mechanisms. Inverse Problems in Science and Engineering, 27(5):565–588, 2019. doi: 10.1080/17415977.2018.1470625.
[4] F. Ahmad, A.L. Hitam, K. Hudha, and H. Jamaluddin. Position tracking of slider crank mechanism using PID controller optimized by Ziegler Nichol’s method. Journal of Mechanical Engineering and Technology, 3(2):27–41, 2011.
[5] C.D. Lee, C.W. Chuang, and C.C. Kao. Apply fuzzy PID rule to PDA based control of position control of slider crank mechanisms. In Proceeding of the IEEE Conference on Cybernetics and Intelligent Systems, pages 508–513, Singapore, 1-3 December, 2004. doi: 10.1109/ICCIS.2004.1460467.
[6] P.A. Simionescu. Optimum synthesis of oscillating slide actuators for mechatronic applications. Journal of Computational Design and Engineering, 5(2):215–231, 2018. doi: 10.1016/j.jcde.2017.09.002.
[7] R.R. Bulatović and S.R. Djordjević. Optimal synthesis of a four-bar linkage by method of controlled deviation. Theoretical and Applied Mechanics, 31(3-4):265–280, 2004. doi: 10.2298/TAM0404265B.
[8] A. Arshad, P. Cong, A.A.E. Elmenshawy, and I. Blumbergs. Design optimization for the weight reduction of 2-cylinder reciprocating compressor crankshaft. Archive of Mechanical Engineering, 68(4):449–471, 2021. doi: 10.24425/ame.2021.139311.
[9] J. Beckers, T. Verstraten, B. Verrelst, F. Contino, and J.V. Mierlo. Analysis of the dynamics of a slider-crank mechanism locally actuated with an act-and-wait controller. Mechanism and Machine Theory, 159:104253, 2021. doi: 10.1016/j.mechmachtheory.2021.104253.
[10] A. Antoniou and W-S. Lu. Practical Optimization. Algorithms and Engineering Applications. Springer, New York, 2007. doi: 10.1007/978-0-387-71107-2.
[11] S. Wu, J. Akroyd, S. Mosbach, G. Brownbridge, O. Parry, V. Page, W. Yang, and M. Kraft. Efficient simulation and auto-calibration of soot particle processes in Diesel engines. Applied Energy, 262:114484, 2020. doi: 10.1016/j.apenergy.2019.114484.
[12] L. Mazouz, S.A. Zidi, A. Hafaifa, S. Hadjeri, and T. Benaissa. Optimal regulators conception for wind turbine PMSG generator using Hooke Jeeves method. Periodica Polytechnica Electrical Engineering and Computer Science, 63(3):151–158, 2019. doi: 10.3311/PPee.13548.
[13] L. Benasla, A. Belmadani, and M. Rahli. Hooke-Jeeves’ method applied to a new economic dispatch problem formulation. Journal of Information Science and Engineering, 24(3):907–917, 2008.
[14] C. Li and A. Rahman. Three-phase induction motor design optimization using the modified Hooke-Jeeves method. Electric Machines & Power Systems, 18(1):1–12, 1990. doi: 10.1080/07313569008909446.
[15] L. Litvinas. A hybrid of Bayesian-based global search with Hooke–Jeeves local refinement for multi-objective optimization problems. Nonlinear Analysis: Modelling and Control, 27(3):534–555, 2022. doi: 10.15388/namc.2022.27.26558.
[16] T.M. Alkhamis and M.A. Ahmed. A modified Hooke and Jeeves algorithm with likelihood ratio performance extrapolation for simulation optimization. European Journal of Operational Research, 174(3):1802–1815, 2006. doi: 10.1016/j.ejor.2005.04.032.
[17] M.F. Tabassum, M. Saeed, N.A. Chaudhry, J. Ali, M. Farman, and S. Akram. Evolutionary simplex adaptive Hooke-Jeeves algorithm for economic load dispatch problem considering valve point loading effects. Ain Shams Engineering Journal, 12(1):1001–1015, 2021. doi: 10.1016/j.asej.2020.04.006.
[18] S.C. Chapra and R. Canale. Numerical Methods for Engineers. Sixth ed. McGraw-Hill, New York, 2010.
[19] C. Zhang, S. Hu, Y. Liu and Q. Wang. Optimal design of borehole heat exchangers based on hourly load simulation. Energy, 116(1):1180–1190, 2016. doi: 10.1016/j.energy.2016. 10.045.
[20] M.H. Heydari, Z. Avazzadeh, C. Cattani. Taylor’s series expansion method for nonlinear variable-order fractional 2D optimal control problems. Alexandria Engineering Journal, 59(6):4737–4743, 2020. doi: 10.1016/j.aej.2020.08.035.
Go to article

Authors and Affiliations

Mehmet Ilteris Sarigecili
1
ORCID: ORCID
Ibrahim Deniz Akcali
1
ORCID: ORCID
  1. Department of Mechanical Engineering, Çukurova University, Adana, Turkey

New geological criteria for domestic phosphorite deposits – a discussion

Sławomir Mazurek Joanna Roszkowska-Remin Tomasz Bienko
Gospodarka Surowcami Mineralnymi - Mineral Resources Management | 2024 | vol. 40 | No 1 | 63-83 | DOI: 10.24425/gsm.2024.149298
Keywords phosphorite ores critical raw materials deposit parameters domestic resources geological documentation open cast mining processing of minerals
Download PDF Download RIS Download Bibtex

Abstract

Phosphate rocks and elemental phosphorus are considered to be critical raw materials mainly because of such parameters as the growing prices of phosphate fertilizers, the high concentration of producers limited to several countries in the world, the exceptional significance of phosphorus in agriculture and the inability to substitute it.
In Poland 100% of the demand phosphate rocks relies on import. The expansion and mining of the nation’s own resource base may be an alternative to import and a way to provide safety of supplies. Historically, phosphorites from the northern margin of the Holy Cross Mountains were extracted using the underground method, which was abandoned in the beginning of the 1970s due to the unprofitability of extraction. However, in eastern and south-eastern Poland, phosphorite concretions of the Eocene age occur at shallow depths, which can have local significance as mineral deposits and might be extracted in open-pit mines. The economics of mining in shallow opencasts do not require such stringent limiting parameters for phosphate deposits as those currently valid, which were established for underground mining conditions.
In this publication, the authors analyzed contemporary conditions for a cost-effective phosphorite deposit, including the price fluctuations of phosphate rock, a review of threshold parameters of deposits for phosphorite projects in the world, and the economics of open-pit ore extraction, where an aggregate mine with mixed extraction (partially from below the water table) was adopted as a point of reference.
As a result, new threshold parameters defining an ore deposit and its boundaries are proposed for Eocene phosphorites in Poland.
Go to article

Authors and Affiliations

Sławomir Mazurek
1
ORCID: ORCID
Joanna Roszkowska-Remin
1
ORCID: ORCID
Tomasz Bienko
1
ORCID: ORCID
  1. Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Study of the influence of the lack of contact in platefin and tube heat exchanger on heat transfer

Dariusz Andrzejewski Marcin Łęcki Artur Gutkowski
Archives of Thermodynamics | 2018 | vol. 39 | No 3 | 63-83
Keywords heat transfer heat exchanger computational fluid dynamics
Download PDF Download RIS Download Bibtex

Abstract

Plate fin-tube heat exchangers fins are bonded with tubes by means of brazing or by mechanical expansion of tubes. Various errors made in the process of expansion can result in formation of an air gap between tube and fin. A number of numerical simulations was carried out for symmetric section of plate fin-tube heat exchanger to study the influence of air gap on heat transfer in forced convection conditions. Different locations of air gap spanning 1/2 circumference of the tube were considered, relatively to air flow direction. Inlet velocities were a variable parameter in the simulations (1– 5 m/s). Velocity and temperature fields for cases with air gap were compared with cases without it (ideal thermal contact). For the case of gap in the back of the tube (in recirculation zone) the lowest reduction (relatively to the case without gap) of heat transfer rate was obtained (average of 11%). The worst performance was obtained for the gap in the front (reduction relatively to full thermal contact in the average of 16%).

Go to article

Authors and Affiliations

Dariusz Andrzejewski
Marcin Łęcki
Artur Gutkowski

Roots of Fear: Pessimistic Speculative Philosophy of History as a Source of the Category of Terror in the Literature of the Romantic Age

Kamil Barski
Ruch Literacki | 2023 | No 1 (376) | 63-83 | DOI: 10.24425/rl.2023.146695
Keywords literature and ideas speculative philosophy of history Romanticism Romantic Gothic horror fiction
Download PDF Download RIS Download Bibtex

Abstract

The horror fiction of the Romantic Age differs considerably from its contemporary descendants. While generally associated with scary entertainment (‘playing with fear’), the Romantic Gothic often enough crossed the line to explore the depths of genuine epistemological, existential or political fears. This would not have been possible without developing its own poetics which drew its strength from a variety of sources. One of them was the speculative philosophy of history in its pessimistic and optimistic variants. They both fed the sense of horror and its literary transpositions. Moreover, they formed a positive feedback loop: anxiety over the course of history led to the use of the devices and registers of the poetics of horror, which in turn led to the amplification of the effects of the historical vision on the reader.
Go to article

Authors and Affiliations

Kamil Barski
1
ORCID: ORCID
  1. Wydział Filologii Polskiej i Klasycznej, Uniwersytet im. Adama Mickiewicza w Poznaniu (Szkoła Doktorska Nauk o Języku i Literaturze)

This page uses 'cookies'. Learn more