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Flow-Controlling Orifice for Impingement Heat Sinks

IP.com Disclosure Number: IPCOM000118730D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Chrysler, GM: AUTHOR [+2]

Abstract

Disclosed is a method for cooling impingement heat sinks which allows the utilization of a large impingement orifice for low-impingement drop in pressure while minimizing the amount of wasted air.

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Flow-Controlling Orifice for Impingement Heat Sinks

      Disclosed is a method for cooling impingement heat sinks which
allows the utilization of a large impingement orifice for
low-impingement drop in pressure while minimizing the amount of
wasted air.

      As the orifice dimension approaches the width or length of the
heat sink, there is an increased amount of wasted air flow - air
which escapes off the edge of the heat sink without passing between
many fins.  This results in a reduced heat-transfer performance.

      Fig. 1 shows an overlapping plan view of a pin fin heat sink
and a number of circular orifices.  The two smaller orifices do not
require any flow control since they are sufficiently smaller than the
heat sink.  Both orifices will provide about the same thermal
performance at a given air flow rate.  The largest orifice pictured
has a diameter equal to the width and length of the heat sink.
Without flow control, there is substantial wasted air flow off the
edges of the  heat sink.

      A flow-control plate is added to the orifice plate in order to
reduce the amount of wasted air.  The flow-control plate has
contoured sides which extend downward around the tips of the heat
sink fins. The  shape is used to block the small flow resistance path
at the center edges  of the heat sink as the orifice dimension
approaches the heat sink dimension.

      The flow-control plate is a simple metal (or plastic or just
about any thin, rigid...