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TECHNICAL PAPERS

Laminar Flow Across a Bank of Low Aspect Ratio Micro Pin Fins

[+] Author and Article Information
Ali Koşar, Chandan Mishra

Department of Mechanical, Aerospace and Nuclear Engineering,  Rensselaer Polytechnic Institute, Troy, NY 12180

Yoav Peles1

Department of Mechanical, Aerospace and Nuclear Engineering,  Rensselaer Polytechnic Institute, Troy, NY 12180

1

Corresponding author. Telephone: 518-276-2886; Fax: 518-276-2623; E-mail: pelesy@rpi.edu

J. Fluids Eng 127(3), 419-430 (Mar 02, 2005) (12 pages) doi:10.1115/1.1900139 History: Received July 29, 2004; Revised February 19, 2005; Accepted March 02, 2005

Pressure drops and friction factors associated with the forced flow of de-ionized water over staggered and in-line circular/diamond shaped micro pin-fin bundles 100μm long with hydraulic diameter of 50 and 100μm have been experimentally investigated over Reynolds number ranging from 5 to 128. Pin fins were arranged according to two different horizontal and vertical pitch ratios (1.5 and 5). The applicability of conventional scale correlations to evaluate micro flow tests results has been assessed. It is shown that the available large-scale correlations do not adequately predict the pressure drop obtained at the micro scale. A modified correlation, based on the experimental results obtained using micro scale devices, has been proposed. The refined correlation accounts for fin density and the endwall effects encountered in micro scale configurations.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

CAD model of pin fin array

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Figure 2

SEM image of pin fins bundle

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Figure 3

Experimental setup

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Figure 4

Pressure drop vs flow rate for device 1SDS through 4SCL

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Figure 9

Comparison between measured and calculated friction factors [Eq. 13] for in-line configuration

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Figure 8

Comparison between measured and calculated friction factors [Eq. 13] for staggered configurations

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Figure 7

π1 to the total friction factor f [Eq. 13] ratio versus H∕D ratio at Re=40

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Figure 6

Friction factors for “compact heat exchanger” approach

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Figure 5

Friction factors for “tube bundle” approach

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