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Research Papers: Micro/Nanoscale Heat Transfer

Slip Flow Heat Transfer in Annular Microchannels With Constant Heat Flux

[+] Author and Article Information
Zhipeng Duan

Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, NL, A1B 3X5, Canadazpduan@engr.mun.ca

Y. S. Muzychka

Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, NL, A1B 3X5, Canadayuri@engr.mun.ca

J. Heat Transfer 130(9), 092401 (Jul 08, 2008) (8 pages) doi:10.1115/1.2946474 History: Received March 30, 2007; Revised February 15, 2008; Published July 08, 2008

Microscale fluid dynamics has received intensive interest due to the emergence of microelectromechanical systems technology. When the mean free path of the gas is comparable to the channel’s characteristic dimension, the continuum assumption is no longer valid and velocity slip and temperature jump may occur at the duct walls. Slip flow heat transfer in annular microchannels has been examined. The effects of velocity slip and temperature jump on the hydrodynamically and thermally fully developed heat transfer characteristics for laminar flow have been studied analytically. The analysis is carried out for both uniform wall heat flux on one wall, adiabatic on the other wall, and uniform wall heat flux on both walls. The results indicate that the slip flow Nusselt numbers are lower than those for continuum flow and decrease with an increase in Knudsen number for most practical engineering applications. The effects of Knudsen number, radius ratio, and heat flux ratio on heat transfer characteristics are discussed, respectively.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

Grahic Jump Location
Figure 1

A concentric circular annular duct with uniform wall heat flux

Grahic Jump Location
Figure 2

Variation of Nusselt number for uniform wall heat flux on the inner wall, adiabatic on the outer wall

Grahic Jump Location
Figure 3

Variation of Nusselt number for uniform wall heat flux on the outer wall, adiabatic on the inner wall

Grahic Jump Location
Figure 4

Variation of Nui for uniform wall heat flux on both walls

Grahic Jump Location
Figure 5

Effects of qi∕qo for Nui for uniform wall heat flux on both walls

Grahic Jump Location
Figure 6

Variation of Nuo for uniform wall heat flux on both walls

Grahic Jump Location
Figure 7

Effects of qi∕qo for Nuo for uniform wall heat flux on both walls

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