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Hybrid Methods in Engineering

ISSN Druckformat: 1099-2391
ISSN Online: 2641-7359

Archives: Volume 1, 1999 to Volume 4, 2002

Hybrid Methods in Engineering

DOI: 10.1615/HybMethEng.v3.i4.10
18 pages

NUSSELT NUMBER VARIATION IN MICROCHANNELS

Gokturk Tunc
Mechanical Engineering and Materials Science Department, Rice University, 6100 Main Street, MS 321, Houston, TX 77005, USA
Yildiz Bayazitoglu
Mechanical Engineering and Materials Science Department, Rice University

ABSTRAKT

Laminar, gaseous flow convective heat transfer in rectangular, parallel plates and circular microchannels is analyzed using the integral transform technique. The slip flow regime is considered. The Nusselt number variation with the Knudsen number is given to show the effects of rarefaction on heat transfer. As the Knudsen number increases, the Nusselt number decreases for all geometries. Between the limits of the slip flow regime, 0 < Kn ≤ 0.12, a reduction of 30−40% in the Nusselt number is observed. Viscous heating is found to be important. A positive Brinkman number will increase the Nusselt number for a uniform temperature and decrease it for a uniform heat flux boundary condition.


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