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Due to the shrinking of the industrial equipment, the heat transfer and cooling of these devices are ofparticular importance. Therefore, this paper studies fluid flow and heat transfer in a micro-channel. Inthis study three-dimensional laminar numerical simulations, based on the Navier–Stokes equations andenergy equation, are obtained for pressure drop and heat transfer in these micro-channel heat sinksunder the same conditions. In this article, the first step is to investigate the effect of channel shape andgeometry on the heat transfer and pressure drop in micro-channels. In, the second step, the effect ofundefined heat flux and distinct input condition is investigated, and third step, the effect of increasingthe number of channels is checked to do an ideal form of heat transfer in a micro-channel. According tothe results, heat transfer using a hexagonal micro-channel is improved 20% on the rectangular microchannel(with equal hydraulic diameter).

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