Browse Prior Art Database

High-Performance Fin Design for a Fan-Mounted Heat Sink

IP.com Disclosure Number: IPCOM000114174D
Original Publication Date: 1994-Nov-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Kim, SJ: AUTHOR

Abstract

A method of enhancing the performance of a fan-mounted heat sink is disclosed. The resistance of the heat sink to the air flow is reduced by making the fins conform to the air flow.

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This is the abbreviated version, containing approximately 79% of the total text.

High-Performance Fin Design for a Fan-Mounted Heat Sink

      A method of enhancing the performance of a fan-mounted heat
sink is disclosed.  The resistance of the heat sink to the air flow
is reduced by making the fins conform to the air flow.

      High speed micro-processors such as the Intel Pentium* are
creating some special challenges for PC makers.  Pentium runs three
to five times hotter than 486 chips and threatens to cause failures
or even melt the circuitry inside a PC if not redesigned to provide
extra cooling.  One way to solve this problem is to mount a 52mm or
60 mm fan to an extruded heat sink.  The intrinsic problem with this
configuration is the associated high impedance (resistance to the air
flow) of the heat sink, which makes the fan ineffective.

      The disclosed idea is to reduce the resistance of the heat sink
to the fan-induced air flow by having novel fin design for the heat
sink.  The Figure shows the radial fins (1) are curved and conform to
the rotating air flow naturally as shown in the Figure.  These curved
fins are attached to the hub of the heat sink (2) just as the blades
are attached to the fan hub.  The hub of the heat sink (2) helps to
increase the thermal mass of the heat sink, which would result in
more uniform temperature distribution inside the heat sink.  In
addition this hub is to avoid the unnecessary air recirculating
region.  The portion of the heat sink right underneath the fan hub
does not contribute t...