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Research Papers: Fundamental Issues and Canonical Flows

Hydrodynamic Characteristics of Crossflow over MEMS-Based Pillars

[+] Author and Article Information
Ali Koşar1

Mechatronics Engineering Program,  SabancıUniversity, Orhanlı, Tuzla, Istanbul, 34956 Turkey

Brandon Schneider, Yoav Peles

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

1

Corresponding author.

J. Fluids Eng 133(8), 081201 (Aug 16, 2011) (11 pages) doi:10.1115/1.4004366 History: Received January 23, 2010; Accepted May 11, 2011; Published August 16, 2011; Online August 16, 2011

A parametric study was performed to reveal the hydrodynamic processes controlling crossflow over MEMS-based micro pin fin devices. Pressure drop experiments were conducted and used to obtain friction factors on a wide range of micro pin fin devices for various flow conditions and geometrical configurations, including pin fin height-to-diameter aspect ratios, spacings, and shapes. The acquired data suggests that the device geometry is the key parameter dictating friction factor trends and magnitude along with the Reynolds number. Additionally, friction factor data has shown that correlations based on experimental results performed on conventional scale tube bundles do not accurately predict the trends under working conditions pertaining to microfluidic systems.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 2

Experimental setup

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Figure 3

Aspect ratio friction factor comparison (H/D): (a),(d) circular inline; (b) diamond inline; and (c) circular staggered pin fins

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Figure 4

(a),(b) Configuration friction factor comparison, inline and staggered for circular pin fins

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Figure 5

Pin spacing friction factor comparison, for circular; (a),(b) inline; and (c) staggered arrangements

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Figure 6

Pin fin shape friction factor comparison, (a) circular and diamond, (b) circular and hydrofoil

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Figure 1

Pin fin array model

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