Effect of geometries and nanofluids on heat transfer and pressure drop in microchannels: A review

Abstract

Effect of different geometries, flow arrangements and nanofluids (NFS) on heat transfer (HT) and pressure drop (PD) for various plenum conditions in microchannels has reviewed in this paper. There is a necessity of cooling of compact electromechanical components where microchannel has great potential to tackle with more than 100 W/m2 heat transfer rate. Managing the pressure drop is the main challenge according to various researchers. The cooling of compact devices was achieved by conventional fluids but to enhance the heat transfer rate, nanofluids are the best alternative. There are various methods for the preparation of nanofluids in which nanoparticles are used with different concentrations for effective cooling. Different parameters such as Reynolds number, fluid inlet temperature (°C), Air inlet velocity (m/s), base fluid and nanoparticle volume concentration are important to analyze the results for effective HT. In this present paper, a review has been made on the effect of various geometries of different materials and size and nanofluids of different concentrations on heat transfer and pressure drop in microchannels.