Browse Prior Art Database

Enhanced Heat Sink with Flow Impedance Optimization

IP.com Disclosure Number: IPCOM000116609D
Original Publication Date: 1995-Oct-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 106K

Publishing Venue

IBM

Related People

Agonafer, D: AUTHOR [+4]

Abstract

A method for shaping a cross-flow heat sink to preferentially direct the coolant flow is disclosed. The concept provides a means to enhance the volumetric performance of a parallel plate heat sink by passively controlling the distribution of air flow within the intra-fin cooling passages by exploiting relationships between viscous drag and geometry.

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Enhanced Heat Sink with Flow Impedance Optimization

      A method for shaping a cross-flow heat sink to preferentially
direct the coolant flow is disclosed.  The concept provides a means
to enhance the volumetric performance of a parallel plate heat sink
by passively controlling the distribution of air flow within the
intra-fin cooling passages by exploiting relationships between
viscous drag and geometry.

      A heat sink is proposed which has the streamwise air flow
resistance proportional to the distance from the base to a horizontal
cross section on the fin.  An example of such a heat sink is shown
where all of the fins (101) have an inverted trapezoid as a cross
sectional geometry.  The resistance to air flow (102) is smaller at
the base of the heat sink (103) due to the reduction in flow path
length thus inducing more air to flow in the bottom part of the fin.
The enhancement is due to the fact that the lower fin region is the
preferred location for the convection of thermal energy from the heat
sink to the coolant.  At the base of the fins the temperature
difference driving heat transfer is greatest and the conduction
losses least, contrasted to the tips of the fins (104) where the
temperature difference falls dramatically due to advection and
conduction losses in the lower regions of the fin.  Thus, the
particular fin shape described will passively direct more coolant
flow into the critical fin base region.

      An alternative design is to incr...