CUED Publications database

Effect of surface roughness on rarefied-gas heat transfer in microbearings

Zhang, W-M and Meng, G and Wei, X-Y and Peng, Z-K (2012) Effect of surface roughness on rarefied-gas heat transfer in microbearings. Physics Letters, Section A: General, Atomic and Solid State Physics, 376. pp. 789-794. ISSN 0375-9601

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Abstract

In this Letter, the rarefaction and roughness effects on the heat transfer process in gas microbearings are investigated. A heat transfer model is developed by introducing two-variable Weierstrass-Mandelbrot (W-M) function with fractal geometry. The heat transfer problem in the multiscale self-affine rough microbearings at slip flow regime is analyzed and discussed. The results show that rarefaction has more significant effect on heat transfer in rough microbearings with lower fractal dimension. The negative influence of roughness on heat transfer found to be the Nusselt number reduction. The heat transfer performance can be optimized with increasing fractal dimension of the rough surface. © 2012 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Fractal geometry Heat transfer MEMS Microbearing Random surface roughness
Subjects: UNSPECIFIED
Divisions: Div C > Applied Mechanics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:04
Last Modified: 08 Dec 2014 02:22
DOI: 10.1016/j.physleta.2012.01.005