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Miniaturization of equipments has lead to an increase in requirement of an effective system to transfer and dissipate heat from a working system, due to the high heat flux that possess. Because of low thermal conductivity and specific heat the heat dissipation is poor in traditional fluids. Thus these traditional fluids are replaced with nanofluids. . There are various studies regarding with their anomalous and unique thermal transport properties. Thus these studies has expanded the field of nanofluids into an unexplored field of cryogenic nanofluids. In this work heat transfer and pressure drop analysis of different cryogen based nanofluids are analysed with different volume fractions(1%-5%). Because of the small size of micro heat exchanger, the heating is more in them. cryogenic base fluid LN2 along with CuO,Al2O3,ZnO,Fe3O4 as nanoparticles are focused on this numerical study. This work aims to investigate what’s the impact on heat transfer rate and pressure drop at different volume fractions along with different combinations of cryogenic nanofluids, inorder to enhance the choices of both base fluid and nanoparticles. For this a computational investigation is carried out in 3-D geometry developed in ANSYS 17 and further analysis is done using FLUENT for steady turbulent developing flow.

Heat Transfer and Fluid Flow Analysis of Cryogen based Nanofluids in a Micro-Heat Exchanger