Browse Prior Art Database

Open-Cell Metal Foam Natural Convection Heat Sink

IP.com Disclosure Number: IPCOM000103981D
Original Publication Date: 1993-Feb-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 32K

Publishing Venue

IBM

Related People

Buller, ML: AUTHOR [+2]

Abstract

Disclosed is a heat sink made from open celled metallic foam. A metallic foam heat sink provides a significant advantage over conventional extruded fin heat sinks because a higher surface to volume ratio can be obtained in the foam than would be attainable in an extrusion. This ratio provides a large surface area where heat transfer occurs. In addition, a metallic foam heat sink will provide for multidirectional airflow instead of being restricted to the unidirectional airflow inherent in extruded heat sinks. Metallic foams are commercially produced and are available in open cell configurations. The density (and so the surface to volume ratio, web thickness and pore size) can be controlled in production.

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Open-Cell Metal Foam Natural Convection Heat Sink

      Disclosed is a heat sink made from open celled metallic foam.
A metallic foam heat sink provides a significant advantage over
conventional extruded fin heat sinks because a higher surface to
volume ratio can be obtained in the foam than would be attainable in
an extrusion.  This ratio provides a large surface area where heat
transfer occurs.  In addition, a metallic foam heat sink will provide
for multidirectional airflow instead of being restricted to the
unidirectional airflow inherent in extruded heat sinks.
     Metallic foams are commercially produced and are available in
open cell configurations.  The density (and so the surface to volume
ratio, web thickness and pore size) can be controlled in production.
The foam could be produced with a solid skin on one side to act as a
heat spreader, as well as for attachment to the chip, module or card
to be cooled.  Aluminum and copper, which are commonly used for heat
sinks because of their high thermal conductivity, are produced in
foam form.
     In practice, a heat sink would be produced using a section of
the open celled metallic foam, which would then be attached to a
device as a heat sink.  Airflow would occur by natural convection
through the foam.  The web sections of the foam would conduct heat
from the device, through the foam, where the heat would transfer to
the air moving through the open cells of the foam.

Disclosed Anonymously.