Due to the existence of a velocity slip and temperature jump on the solid walls, the heat transfer in microchannels significantly differs from the one in the macroscale. In our research, we have focused on the pressure driven gas flows in a simple finite microchannel geometry, with an entrance and an outlet, for low Reynolds and low Knudsen numbers. For such a regime, the slip induced phenomena are strongly connected with the viscous effects. As a result, heat transfer is also significantly altered. For the optimization of flow conditions, we have investigated various temperature gradient configurations, additionally changing Reynolds and Knudsen numbers. The entrance effects, slip flow, and temperature jump lead to complex relations between flow behavior and heat transfer. We have shown that slip effects are generally insignificant for flow behavior. However, two configuration setups (hot wall cold gas and cold wall hot gas) are affected by slip in distinguishably different ways. For the first one, which concerns turbomachinery, the mass flow rate can increase by about 1% in relation to the no-slip case, depending on the wall-gas temperature difference. Heat transfer is more significantly altered. The Nusselt number between slip and no-slip cases at the outlet of the microchannel is increased by about 10%.
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e-mail: tomasz.lewandowski@imp.gda.pl
e-mail: tomasz.ochrymiuk@imp.gda.pl
e-mail: justyna.czerwinska@artorg.unibe.ch
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Modeling of Heat Transfer in Microchannel Gas Flow
Tomasz Lewandowski,
Tomasz Lewandowski
Institute of Fluid Flow Machinery,
e-mail: tomasz.lewandowski@imp.gda.pl
Polish Academy of Sciences
, Fiszera 14, 80-952 Gdansk, Poland
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Tomasz Ochrymiuk,
Tomasz Ochrymiuk
Institute of Fluid Flow Machinery,
e-mail: tomasz.ochrymiuk@imp.gda.pl
Polish Academy of Sciences
, Fiszera 14, 80-952 Gdansk, Poland
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Justyna Czerwinska
Justyna Czerwinska
Artorg Center,
e-mail: justyna.czerwinska@artorg.unibe.ch
University of Bern
, Stauffacherstrasse 78, CH-3014 Bern, Switzerland
Search for other works by this author on:
Tomasz Lewandowski
Institute of Fluid Flow Machinery,
Polish Academy of Sciences
, Fiszera 14, 80-952 Gdansk, Polande-mail: tomasz.lewandowski@imp.gda.pl
Tomasz Ochrymiuk
Institute of Fluid Flow Machinery,
Polish Academy of Sciences
, Fiszera 14, 80-952 Gdansk, Polande-mail: tomasz.ochrymiuk@imp.gda.pl
Justyna Czerwinska
Artorg Center,
University of Bern
, Stauffacherstrasse 78, CH-3014 Bern, Switzerlande-mail: justyna.czerwinska@artorg.unibe.ch
J. Heat Transfer. Feb 2011, 133(2): 022401 (15 pages)
Published Online: November 2, 2010
Article history
Received:
September 29, 2009
Revised:
July 30, 2010
Online:
November 2, 2010
Published:
November 2, 2010
Citation
Lewandowski, T., Ochrymiuk, T., and Czerwinska, J. (November 2, 2010). "Modeling of Heat Transfer in Microchannel Gas Flow." ASME. J. Heat Transfer. February 2011; 133(2): 022401. https://doi.org/10.1115/1.4002438
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