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Technical Briefs

Mixed Convection in a Vertical Microannulus Between Two Concentric Microtubes

[+] Author and Article Information
Mete Avcı

Department of Mechanical Engineering, Karadeniz Technical University, 61080 Trabzon, Turkey

Orhan Aydın1

Department of Mechanical Engineering, Karadeniz Technical University, 61080 Trabzon, Turkeyoaydin@ktu.edu.tr

1

Corresponding author.

J. Heat Transfer 131(1), 014502 (Oct 17, 2008) (4 pages) doi:10.1115/1.2977552 History: Received February 04, 2008; Revised April 22, 2008; Published October 17, 2008

In this study, fully developed mixed convective heat transfer of a Newtonian fluid in a vertical microannulus between two concentric microtubes is analytically investigated by taking the velocity slip and the temperature jump at the wall into account. The effects of the mixed convection parameter Gr/Re, the Knudsen number Kn, and the aspect ratio r* on the microchannel hydrodynamic and thermal behaviors are determined. Finally, a Nu=f(GrRe,Kn,r*) expression is developed. It is disclosed that increasing Gr/Re enhances heat transfer while rarefaction effects considered by the velocity slip and the temperature jump in the slip flow regime decreases it.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 4

The variation of the Nu with Kn at different values of Gr∕Re=50 for r*=0.5

Grahic Jump Location
Figure 5

The variation of the Nu with r* at different values of Kn for Gr∕Re=50

Grahic Jump Location
Figure 3

Dimensionless temperature distribution at different values of Kn

Grahic Jump Location
Figure 2

Dimensionless velocity distribution at different values of Kn for Gr∕Re=50

Grahic Jump Location
Figure 1

Schematic of the flow domain

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