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Influence of Cross Sectional Shape on the Heat Transfer Characteristics of Ladder Type Micro Channel Heat Sinks for ULSI
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Abstract
Micro-fluidic heat sinks are generally regarded as an effective method for the heat transfer in integrated electronic circuits and much effort has been put into improving their capacities A collection of parallel ladder type micro channels with rectangular cross section have been introduced and extensively studied by the authors for heat sinking in ULSI circuits and their performance has been reported to be superior to conventionally used collection of parallel rectangular micro channels. This paper focuses on the ladder type micro channel heat sinks with three different cross-sectional shapes with constant area (rectangular, trapezoidal, and triangular) in order to bring out the influence of cross sectional shapes on the heat sinking performance and attempts to identify the cross sectional shape that can ensure lower thermal resistance and highest value of convective heat transfer coefficient h. The flow performance of these three shapes of ladder type micro channels have been studied using COMSOL multiphysics and the comparison of the flow performance indicating parameters of the three shapes show that better hydraulic performance can be achieved using the ladder type triangle micro channels. Further the thermal responses of these micro fluidic systems have also been studied extensively using coupled thermal - hydraulic analysis and these studies show that the lowest thermal resistance and highest value of convective heat transfer coefficient h is achieved with the introduction of ladder type triangle micro channels followed by trapezium and rectangle shape micro channels.
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