Browse Prior Art Database

Self Contained Active Enhancement for Low Flowrate Liquid Cooling

IP.com Disclosure Number: IPCOM000118129D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Anderson, TM: AUTHOR [+3]

Abstract

Disclosed is a method of enhancing heat transfer in low flowrate or gravity-driven liquid coldplates. The turbulence is increased locally to provide the necessary heat transfer enhancement.

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Self Contained Active Enhancement for Low Flowrate Liquid Cooling

      Disclosed is a method of enhancing heat transfer in low
flowrate or gravity-driven liquid coldplates.  The turbulence is
increased locally to provide the necessary heat transfer enhancement.

      This disclosure presents an alternative method to increase
heat transfer especially suited for gravity-driven or low low rate
flows in liquid-cooled coldplates.  Rather than increase the heat
transfer via higher fin area (and density) or via greater flow rate,
enhancement is promoted by the localized increase in turbulent energy
in the vicinity  of the heated surface.

      An application of the concept is shown in the Figure.  A
cross-section of a small multi-chip module (11) that superficially
appears to be cooled by a low flowrate of liquid coolant in
cross-flow (12).  The invention adds a miniature piezoelectric pump
(13) disposed  such that the action of the pump will generate a
significant increase in the turbulent energy of the coolant in the
vicinity of the chips (14)  with the highest power levels.  This will
result in a beneficial increase  in the mixing of the bulk coolant
and a periodic disturbance of the thermal and hydrodynamic boundary
layers.  A shroud or partial duct could  be employed to assist in
focussing the thermal mixing at the chip backside.

      The advection of the heated liquid would need to be provided by
an external circulator or by a gravity feed.  ...