Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Pin Fin Heat Sink Impingement Cooling Enhancement Using Flow Baffles

IP.com Disclosure Number: IPCOM000111108D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Sathe, S: AUTHOR [+2]

Abstract

Disclosed is a method of obtaining enhanced cooling from a pin-fin heat sink in the impingement mode by the novel use of flow baffles. This method provides a way of either enhancing the performance of existing pin fin heat sinks, or designing new enhanced pin fin heat sinks, with minimal additional cost and at a minimal or no pressure drop penalty.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 73% of the total text.

Pin Fin Heat Sink Impingement Cooling Enhancement Using Flow Baffles

      Disclosed is a method of obtaining enhanced cooling from a
pin-fin heat sink in the impingement mode by the novel use of flow
baffles.  This method provides a way of either enhancing the
performance of existing pin fin heat sinks, or designing new enhanced
pin fin heat sinks, with minimal additional cost and at a minimal or
no pressure drop penalty.

      Consider a typical mode in which a pin-fin heat sink operates
such as the IBM 4381 heat sink in Fig. 1.  Air impinges through a
square nozzle from the top and flows out from the four sides.  In
some applications, air may be supplied from the top by means of a fan
directly attached to the heat sink.

      In this invention, baffles are used to obtain cooling
enhancement.  The baffles could be permanently bonded or be
integrally die-cast with the heat sink.  It was found through tests
that the position shown in Fig. 2, namely bottom center of the side
of the heat sink produced the best enhancement.  Placing baffles at
other locations, in fact, reduced the cooling performance.

      Engineering test data on pressure drop and Rext (heat sink to
air thermal resistance) were obtained for the heat sink with baffles
and compared with the data obtained on the same heat sink with no
baffles.  All data were checked for repeatability.  The enhancement
in Rext was typically 10-20 percent for the IBM 4381 heat sink over
an airflow range...