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TECHNICAL BRIEFS

# Effects of Two-Dimensional Roughness in Flow in Microchannels

[+] Author and Article Information
Xiang-Qi Wang, Christopher Yap

Department of Mechanical and Production Engineering,  National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

Arun Sadashiv Mujumdar1

Department of Mechanical and Production Engineering,  National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

1

Corresponding author. Fax: +65-6779-1459; e-mail: mpeasm@nus.edu.sg

J. Electron. Packag 127(3), 357-361 (Aug 05, 2004) (5 pages) doi:10.1115/1.1997164 History: Received April 06, 2004; Revised August 05, 2004

## Abstract

The friction factors of single-phase microchannel with various roughness elements (rectangular, triangular, elliptical) were investigated numerically. The two-dimensional numerical solution shows significant influence of surface roughness including the height, size, and spacing of the roughness elements on the Poiseuille number. The fluid temperature effects are also investigated numerically for the rough channels.

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Copyright © 2005 by American Society of Mechanical Engineers
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## Figures

Figure 5

P0* as function of distance between roughness elements with h=4.5, 9, 18μm, s=4.5, 9, 18μm, H=180μm, Re=40, water

Figure 6

The Poiseuille number as function of temperature

Figure 1

Geometry parameter of roughness: (a) rectangular elements, (b) triangular elements, and (c) elliptical elements

Figure 2

P0* as function of Reynolds number for different roughness elements and the fluid is water with constant temperature (T=293K)

Figure 3

P0* as function of roughness element height with s=9μm, p=18μm, H=180μm, Re=40, water

Figure 4

P0* as function of roughness element size with h=4.5, 9, 18μm, p=18, 36, 72μm, H=180μm, Re=40, water

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