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Variable Property Effects in Single-Phase Incompressible Flows Through Micro Tubes

[+] Author Affiliations
Heinz Herwig

TU Hamburg-Harburg, Hamburg, Germany

Shripad P. Mahulikar

Indian Institute of Technology, Mumbai, India

Paper No. ICMM2005-75082, pp. 245-250; 6 pages
doi:10.1115/ICMM2005-75082
From:
  • ASME 3rd International Conference on Microchannels and Minichannels
  • ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B
  • Toronto, Ontario, Canada, June 13–15, 2005
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4185-5 | eISBN: 0-7918-3758-0
  • Copyright © 2005 by ASME

abstract

In a systematic approach we address the question of how important variable property effects are for flows in micro-sized channels. Due to heat transfer, the temperature dependence of fluid properties like viscosity and thermal conductivity results in deviations in a solution that accounts for that dependence compared to a solution for constant fluid properties. Compared to flows through macro-sized geometries it turns out that two distinct scaling effects lead to a strong influence of variable fluid properties in micro-sized channels. Examples are given in which Nusselt numbers differ by up to 30% depending on how the property behaviour is accounted for.

Copyright © 2005 by ASME
Topics: Flow (Dynamics)

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