Research Papers

Optimization of Pool Boiling Heat Sinks Including the Effects of Confinement in the Interfin Spaces

[+] Author and Article Information
Karl J. Geisler

 General Dynamics Advanced Information Systems, 8800 Queen Avenue South, Bloomington, MN 55105

Avram Bar-Cohen

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

J. Electron. Packag 130(4), 041002 (Nov 14, 2008) (8 pages) doi:10.1115/1.2993135 History: Received December 11, 2007; Revised April 11, 2008; Published November 14, 2008

A finite element analysis approach is developed and used to efficiently evaluate and optimize the boiling performance of longitudinal rectangular plate fin heat sinks, including the explicit dependence of fin spacing on boiling heat transfer coefficients and on the critical heat flux (CHF). Polished silicon heat sinks are shown to dissipate at nearly five times the CHF limit of the unfinned base area and outperform comparable aluminum heat sinks by a factor of 2. For optimum heat sink geometries, over the parameter ranges explored, the fin thickness is found to be approximately equal to the fin spacing, and the relationship between the optimum thickness and spacing is demonstrated to be relatively insensitive to the fin thermal conductivity. Results suggest that even greater performance enhancements may be gained with appropriately-selected advanced materials.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 8

Maximum base heat flux for 20mm long silicon heat sinks and the optimum fin thickness as a function of fin spacing

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Figure 9

Single fin heat dissipation for 0.29mm thick aluminum and silicon fins, with base temperatures at the superheat corresponding to an unconfined pool boiling heat flux of 45kW∕m2 for each surface

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Figure 1

Longitudinal rectangular plate fin heat sink geometry with nomenclature

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Figure 2

Sample contour plot of the temperature solution for a 0.7mm thick 10mm high aluminum fin with a base temperature 14°C above saturation

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Figure 3

Experimental boiling curves for EDM aluminum heaters in saturated FC-72 at atmospheric pressure (17)

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Figure 4

Total heat sink heat dissipation for various fin configurations, 20×20mm2 base and EDM aluminum surface, in saturated FC-72 at atmospheric pressure

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Figure 5

Loci of maxima of 20mm wide aluminum heat sink performance curves

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Figure 6

Total heat sink heat dissipation as a function of the fin height for the optimized aluminum heat sinks in Table 1

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Figure 7

Fin thickness trends for polished silicon heat sinks with 0.3mm fin spacing and 20mm sink length



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