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RESEARCH PAPERS: Heat Transfer Enhancement

Effects of Perpendicular Flow Entry on Convective Heat/Mass Transfer From Pin-Fin Arrays

[+] Author and Article Information
M. K. Chyu, Y. Hsing

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213

V. Natarajan

The BOC Group Technical Center, Murray Hill, NJ 07947

J. S. Chiou

Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan

J. Heat Transfer 121(3), 668-674 (Aug 01, 1999) (7 pages) doi:10.1115/1.2826031 History: Received March 25, 1997; Revised March 02, 1999; Online December 05, 2007

Abstract

Convective heat transfer with pin-fin arrays have been studied extensively in laboratory experiments where flow is introduced to the array uniformly over the channel span. However, the flow path in actual cooling designs is often serpentine-shaped with multiple turns, and the pin-fin array section is often located immediately downstream of a turn. The present study, using an analogous mass transfer technique based on naphthalene sublimation, investigates the effects of three different, nonaxial flow entries on array heat transfer for both an inline and a staggered arrangement of pins. The measurement acquires the mass transfer rate of each individual pin in a five row by seven column array for the Reynolds number varying from 8000 to 25,000. The mass transfer and associated flow visualization results indicate that the highly nonuniform flow distribution established at the array entrance and persisting through the entire array can have significant effects on the array heat transfer characteristics. Compared to the conventional case with axial-through flow entrance, the overall array heat transfer performance can be either enhanced or degraded, depending on the actual inlet arrangements and array configurations.

Copyright © 1999 by The American Society of Mechanical Engineers
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