Browse Prior Art Database

Foam Heat Sink Design with Focus on Improved Heat Transfer

IP.com Disclosure Number: IPCOM000118836D
Original Publication Date: 1997-Jul-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Agonafer, D: AUTHOR [+3]

Abstract

Disclosed is a method for distributing flow in a foam heat sink design such that the flow is biased towards the hottest region.

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This is the abbreviated version, containing approximately 88% of the total text.

Foam Heat Sink Design with Focus on Improved Heat Transfer

      Disclosed is a method for distributing flow in a foam heat sink
design such that the flow is biased towards the hottest region.

      A typical foam heat sink is made of many intertwined aluminum
filaments, and as a result of the substantial mixing and turbulence,
a very high effective heat transfer coefficient is realized.  In this
disclosure, a simple approach of ensuring a heat flow path to the
region of higher heat flux is described.  The Figure depicts a foam
heat sink  (1) made of different density-layered foam (2), (3), and
(4) attached to a solid base (5) where the density of the foams
decreases as it approaches the heated region.  This approach is
equally suitable for both impinging and parallel flow.  For an
impingement flow, the foam density can also be tailored to be
non-uniform in the planar section (3) so that air flow is biased
towards the non-central region of heated  surface where the heat
transfer coefficient is less.

      The different-layered foam heat sink can be manufactured as
follows:  All sections of the multi-density foam heat sink are first
cut to size.  In the case of a pin fin enhanced heat sink, the
clearance holes for the pins are machined into the foam sections
(another option  would be to do this step last, but that would
require two brazing operations: one to assemble the foam parts and
one to braze the foam parts into the solid base and fins).  The fo...