Browse Prior Art Database

Foam Enhanced Heat Sink

IP.com Disclosure Number: IPCOM000117600D
Original Publication Date: 1996-Apr-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 149K

Publishing Venue

IBM

Related People

Anderson, TM: AUTHOR [+3]

Abstract

Disclosed is a method to enhance the air cooling performance of heat sinks by combining the best aspects of jet impingmement and thermally conductive metallic foams.

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Foam Enhanced Heat Sink

      Disclosed is a method to enhance the air cooling performance
of heat sinks by combining the best aspects of jet impingmement and
thermally conductive metallic foams.

      An aluminum foam heat sink, made of many intertwined aluminum
filaments, has been proposed for cooling high power modules.  The
torturous air flow path creates substantial mixing and turbulence,
resulting in a very high effective heat transfer coefficient.
However, the thin filaments of aluminum that give rise to the high
effective heat transfer coefficient have a very large length to
diameter ratio and, therefore, limit the maximum height of the heat
sink.  A method of delivering the thermal energy to the upper regions
of the aluminum foam with minimal temperature drop is described to
greatly improve the effectiveness of the aluminum foam heat sink.

      Fig. 1 shows a simple, inexpensive technique of providing
"highways" of heat flow to the upper reaches of the aluminum foam
heat sink.  As can be seen in Fig. 1, a heat sink (101) with parallel
plate fins (102) is created with the aluminum foam (103) placed
between adjacent set of fins.  The space between fins is much larger
than that of a conventional parallel plate fin heat sink, and the
fins are thicker.  The highly efficient conduction path provided by
the fins delivers thermal energy with little temperature drop to the
entire vertical expanse of aluminum foam.  The conduction path
through the foam i...