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Proceedings Paper

A Parametric Study Of Mesh Enhanced Forced Convection Heat Transfer For The Cooling Of High Power Density Mirrors
Author(s): W W Yuen; R V Fleishman
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Paper Abstract

By sandwiching a single layer of wire screen mesh mechanically between two surfaces, a simple heat transfer enhance-ment mechanism has been demonstrated recently (Fleishman and Yuen, 1988) to be effective for general high heat flux applications. Average heat transfer coefficients of up to 9.5 W/cm2K were measured for a smooth plane surface cooled by water. Based on a first-order mathematical model, the enhancement factor was shown to be a function of mesh wire diameter, thermal conductivity, screen pitch, surface heat transfer coefficient, and a non-dimensional thermal contact resistance. In this work, additional data are generated to further understand quantitatively the performance characteristics of the mesh-enhanced heat transfer mechanism. Specifically, average heat transfer coefficients ranged between 0.7 to 6.2 W/cm2K are measured for three different screen materials (brass, stainless steel, and copper) in a 26 cm2 fixture cooled by city water under line pressure. Heating rates range from 200 to 350 kW/m2 and flow rates from 0.004 to 0.086 kg Is . Effect of macroscopic screen parameters such as thermal conductivity, the weaving pattern of the wire and the "flatness" of the screen are investigated. The mathematical model is further developed to predict parametrically the optimized conditions for maximum heat transfer. The applicability of the present mesh-enhanced heat transfer mechanism for the cooling of high power density mirrors is assessed.

Paper Details

Date Published: 11 July 1989
PDF: 15 pages
Proc. SPIE 1047, Mirrors and Windows for High Power/High Energy Laser Systems, (11 July 1989); doi: 10.1117/12.951351
Show Author Affiliations
W W Yuen, University of California at Santa Barbara (United States)
R V Fleishman, University of California at Santa Barbara (United States)

Published in SPIE Proceedings Vol. 1047:
Mirrors and Windows for High Power/High Energy Laser Systems
Claude A. Klein, Editor(s)

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