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Under fully developed flow conditions, the convective heat transfer coefficient is inversely proportional to the hydraulic diameter of the channel through which a coolant flows. In addition, inside a heat sink several smaller channels can be used in place of a single larger channel as a means of increasing the convective heat transfer area per unit volume. Based on this rationale, microchannels were proposed for high heat flux cooling applications. Unfortunately, for a given flow velocity the pressure drop is also inversely proportional to the square of the diameter of the flow channel.