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Kinetic Heat Sink
Keywords: Thermal management, efficient heatsinks, heat transfer
Conventional heat sinks for microprocessors achieve higher heat transfer efficiency by directing air flow over stationary fins at a high velocity (~ 5 m/s) and flow rates (30-60 cfm). Further attempts to improve film heat transfer coefficient by means of increasing the air speed invariably results in higher acoustic noise. The Kinetic Heat Sink (KHS) is a novel concept that utilizes rotating metals fins to conduct heat to the cooling medium. The configuration allows the air to be radially directed over a heat sink with a promise of higher heat transfer coefficient at practical flow rates. Improved efficiency of heat transfer is anticipated because of higher relative tangential velocities offered by rotating the fins. The need to move the fins relative to the stationary heat source, however, imposes a technology challenge. A highly conductive thin liquid film to couple the stationary heat source to the fins is required. The concept of the KHS has been evaluated by a number of prototypes that have been built and tested. This paper will introduce the prototype designs and present the results of the testing. Finally the technical and performance challenges facing the KHS will be summarized.
Vijay Khanna, Research Staff Member
IBM, T.J. Watson Research Center
Yorktown Heights, NY

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