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Three Dimensional Numerical Simulation of Gas Heat Transfer in Rectangular Microchannels

[+] Author Affiliations
Xiaohong Yan

Xi’an Jiaotong University, Xi’an, Shaanxi, China; University of Pennsylvania, Philadelphia, PA

Qiuwang Wang

Xi’an Jiaotong University, Xi’an, Shaanxi, China

Paper No. IHTC14-22713, pp. 117-121; 5 pages
doi:10.1115/IHTC14-22713
From:
  • 2010 14th International Heat Transfer Conference
  • 2010 14th International Heat Transfer Conference, Volume 6
  • Washington, DC, USA, August 8–13, 2010
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4941-5 | eISBN: 978-0-7918-3879-2
  • Copyright © 2010 by ASME

abstract

Rectangular microchannel is the typical component of the micro heat exchangers and micro heat sinks. Three-dimensional compressible Navier-Stokes equations are solved for gas flow and heat transfer in microchannels under uniform heat flux boundary condition. The numerical methodology is based on the control volume SIMPLE scheme. It is found that the heat removal characteristic for compressible flow is better than the incompressible flow and it is not suitable to use conventionally defined Nu to measure the heat transfer characteristic for compressible heat transfer. The effect of the aspect ratio (width to height) on the cross-sectional averaged wall temperature and the Nu is negligible under the uniform heat flux boundary condition. However, the local uniformity of the wall temperature is significantly influenced by the aspect ratio. The square cross-section exhibits the best local uniformity of the wall temperature.

Copyright © 2010 by ASME

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