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Abstract

The main objective of these experiments was to study the oxygen mass transfer rate through the volumetric mass transfer coefficient (kLa) for an experimental set-up equipped with a rotating magnetic field (RMF) generator and various liquids. The experimental results indicated that kLa increased along the magnetic strength and the superficial gas velocity. Mathematical correlations defining the influence of the considered factors on kLa were proposed.

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Authors and Affiliations

Rafał Rakoczy
Maciej Konopacki
Marian Kordas
Radosław Drozd
Karol Fijałkowski
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Abstract

In this paper, the results of the study on aluminium evaporation from the Al-Zn alloys (4.2% weight) during remelting in a vacuum induction furnace (VIM) are presented. The evaporation of components of liquid metal alloys is complex due to its heterogeneous nature. Apart from chemical affinity, its speed is determined by the phenomena of mass transport, both in the liquid and gas phase. The experiments were performed at 10-1000 Pa for 953 K - 1103 K. A significant degree of zinc loss has been demonstrated during the analysed process. The relative values of zinc loss ranged from 4 to 92%. Lowering the pressure in the melting system from 1000 Pa to 10 Pa caused an increase in the value of density of the zinc evaporating stream from 3.82⋅10-5 to 0.000564 g⋅cm-2⋅s-1 at 953 K and 3.32⋅10-5 to 0.000421 g⋅cm-2⋅s-1 for 1103 K. Based on the results of the conducted experiments. it was found that evaporation of zinc was largely controlled by mass transfer in the gas phase and only for pressure 10 Pa this process was controlled by combination of both liquid and gas phase mass transfer.
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Bibliography

[1] Guo, J., Liu, Y. & Su, Y. (2002). Evaporation of multi-components in Ti-25Al-25Nb melt during induction skull melting process. Transaction of Nonferrous Metals Society of China. 12(4), 587-591.
[2] Blacha, L., Mizera, J. & Folega, P. (2013). The effects of mass transfer in the liquid phase on the rate of aluminium evaporation from the Ti-6Al-7Nb alloy. Metalurgija, 53(1), 51-54.
[3] HSC Chemistry ver. 6.1. Outocumpu Research Oy. Pori.
[4] Plewa, J. (1987). Examples of calculations from the theory of metallurgical processes. Gliwice: Wydawnictwo Politechniki Śląskiej. (in Polish).
[5] Ozberk, E. & Guthrie, R. (1986). A kinetic model for the vacuum refining of inductively stirred copper melts. Metallurgical Transactions B. 17, 87-103.
[6] Nash, P.M. & Steinemann, S.G. (2006). Density and thermal expansion of molten manganese. Iron. Nickel. Copper. Aluminium and Tin by Means of the Gamma-Ray Attenuation Technique. Physics and Chemistry of Liquids, An International Journal. 29(1), 43-58.
[7] Assael, M., Kakosimos, K. & Banish, R. (2006). Reference data for the density and viscosity of liquid aluminum and liquid iron. Journal of Physical and Chemical Reference Data. 35(1), 285-301.
[8] Smalcerz, A., Węcki B. & Blacha L. (2021) Influence of the power of various types of induction furnaces on the shape of the metal bath surface. Advances in Science and Technology Research Journal. 15(3), 34-42. DOI: 10.12913/22998624/138245
[9] Homma, M., Ohno, R., & Ishida, T. (1996). Evaporation of manganese. copper. and tin from molten iron under, vacuum. Science Reports of the Research Institutes, Tohuku University. Series A – Physics. chemistry and metallurgy. 18, 356-365.
[10] Ohno, R. & Ishida, T. (1967). Solution rate of solid iron in liquid copper, ISIJ International. 31(10), 1164-1169.
[11] Chen, X. & Ito, N. (1995). Evaporation rate of copper in high carbon iron melt under reduced pressure. Tetsu-to-Hagane. 81(10), 959-964.
[12] Savov, L. & Janke, D. (2000). Evaporation of cu and sn from induction-stirred iron-based melts treated at reduced pressure. ISIJ International. 40(2), 95-104.
[13] Łabaj, J. (2012). Kinetics of cooper evaporation from the Fe-Cu Alloys under Reduced Pressure. Archives of Metallurgy and Materials. 57(1), 165-172.
[14] Maruyama, T., Katayama, H., Momono, T., Tayu, Y, & Takenouchi, T. (1998). Evaporation rate of copper from molten iron by urea spraying under reduced pressure. Tetsu-to-Hagane. 84(4), 243-248.
[15] Ono-Nakazato, H. & Taguchi, K. (2003). Effect of silicon and carbon on the evaporation rate of copper in molten iron. ISIJ International. 43(11), 1691-169.
[16] Bellot, J.P., Duval, H., Ritchie, M., Mitchell, A. & Ablitzer, D. (2001). Evaporation of Fe and Cr from induction-stirred austenitic stainless steel-influence of the inert gas pressure, ISIJ International. 41(7), 696-705.
[17] Siwiec, G. (2013). The kinetics of aluminium evaporation from the Ti-6Al-4V alloy. Archives of Metallurgy and Materials. 58(4), 1155-1160.
[18] Blacha, L. Golak, S. Jakovics, S. & Tucs A. (2014) Kinetic analysis of aluminum evaporation from Ti-6Al-7Nb. Archives of Metallurgy and Materials. 59, 275-279. DOI: 10.2478/amm-2014-0045.
[19] Blacha, L., Burdzik, R. Smalcerz, A. & Matuła, T. (2013). Effects of pressure on the kinetics of manganese evaporation from the OT4 alloy. Archives of Metallurgy and Materials. 58(1), 197-201.
[20] Harris, R. (1984). Vacuum refining copper melts to remove bismuth, arsenic and antimony. Metallurgical Transaction B. 15, 251-257.
[21] Harris, R., McClincy, R.J. & Riebling, E.F. (1987). Bismuth, arsenic and antimony removal from anode copper via vacuum distillation. Canadian Metallurgical Quarterly. 26(1), 1-4.
[22] Ozberk, B., Guthire, R.I.L. (1987). Vacuum melting of copper evaporation – evaporation of impurities. Proc. 6th Int. Vacuum Metallurgy Conf. American Vacuum Society. San Diego. 248-267.
[23] Machlin, E.S. (1961). Kinetics of vacuum induction refining – theory. the american institute of mining. Metallurgical. and Petroleum Engineers.
[24] Tarapore, E.D. & Evans, J. (1976). Fluid velocities in induction melting furnaces: Part I. Theory and laboratory experiments. Metallurgical Transaction B. 7, 343-351.
[25] Tarapore, E.D., Evans, J. & Langfeld, J. (1977). Fluid velocities in induction melting furnaces: Part II. large scale measurements and predictions. Metallurgical Transaction B. 8, 179-184.
[26] Szekely, J., Chang, W. & Johnson, W. (1977). Experimental measurement and prediction of melt surface velocities in a 30.000 lb inductively stirred melt. Metallurgical Transaction B. 8, 514-517.
[27] Przyłucki, R. Golak, S. Oleksiak, B. & Blacha L. (2012). Influence of an induction furnace's electric parameters on mass transfer velocity In the liquid phase. Metalurgija. 1, 67-70.
[28] Blacha, L. Przylucki, R. Golak, S. & Oleksiak B. (2011). Influence of the geometry of the arrangement inductor - crucible to the velocity of the transport of mass in the liquid metallic phase mixed inductive. Archives of Civil and Mechanical Engineering. 11, 171-179 DOI: 10.1016/S1644-9665(12)60181-2
[29] Du, Y., Chang, Y., Huang, B., Gong, W. & Jin, Z. (2003). Diffusion coefficients of some solutes in fcc and liquid Al: critical evaluation and correlation. Materials Science and Engineering: A. 363(1-2), 140-151.
[30] Harris, R. & Davenport, W.G. (1982). Vacuum distillation of liquid metals: Part I. Theory and experimental study. Metallurgical Transactions B. 13, 581-588.

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Authors and Affiliations

Albert Smalcerz
ORCID: ORCID
Leszek Blacha
ORCID: ORCID
B. Węcki
1
ORCID: ORCID
D.G. Desisa
2
ORCID: ORCID
J. Łabaj
3
ORCID: ORCID
M. Jodkowski
1
ORCID: ORCID

  1. Department of Testing and Certification "ZETOM", Poland
  2. Department of Industrial, Informatics Silesian University of Technology, Joint Doctorate School, Poland
  3. Faculty of Materials Engineering, Silesian University of Technology, Poland
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Abstract

Adsorption experiments of nitric oxide in nitrogen carrier gas were held on activated carbon in a fixed bed flow system. Breakthrough curves describing the dependence of exit concentrations of nitric oxide on time were matched with theoretical response curves calculated from the linear driving force model (LDF). The model assumes Langmuir adsorption isotherm for the description of non-linear equilibrium and overall mass transfer coefficient for mass transfer mechanism. Overall mass transfer coefficients were obtained by the method of least squares for fitting numerically modelled breakthrough curves with experimental breakthrough curves. It was found that LDF model fits all the breakthrough curves and it is a useful tool for modelling purposes.

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Authors and Affiliations

Lenka Kuboňová
Lucie Obalová
Oldřich Vlach
Ivana Troppová
Jaroslav Kalousek
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Abstract

It is known that external diffusional resistances are significant in immobilized enzyme packed-bed reactors, especially at large scales. Thus, the external mass transfer effects were analyzed for hydrogen peroxide decomposition by immobilized Terminox Ultra catalase in a packed-bed bioreactor. For this purpose the apparent reaction rate constants, kP, were determined by conducting experimental works at different superficial velocities, U, and temperatures. To develop an external mass transfer model the correlation between the Colburn factor, JD, and the Reynolds number, Re, of the type JD = K Re(n-1) was assessed and related to the mass transfer coefficient, kmL. The values of K and n were calculated from the dependence (am kp-1 - kR-1) vs. Re-1 making use of the intrinsic reaction rate constants, kR, determined before. Based on statistical analysis it was found that the mass transfer correlation JD = 0.972 Re-0.368 predicts experimental data accurately. The proposed model would be useful for the design and optimization of industrial-scale reactors.

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Authors and Affiliations

Ireneusz Grubecki

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