Technology advances in microchips and miniaturized refrigeration systems require heat to be removed at a high flux. Microchannel heat exchangers have been implemented for the efficient removal of heat in these applications. However, the maximum achievable heat flux is still limited even when two-phase flow (evaporation) is used, due to the formation of vapor film along the wall of the heat exchanger. In this presentation, the principle of using a suspension of microcapsules in liquid as a heat transfer fluid to improve the performance of microchannel heat exchangers will be discussed. The microcapsules contain phase change material, which melts and solidifies at a specified range of temperatures. These microcapsules improve the fluid effective specific heat capacity and thermal conductivity due to latent heat effect and micro mixing respectively.

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