Numerical Investigation of Heat Transfer Performance of Microchannel with Wall-Mounted Obstacles Using Hybrid Nanofluids

Abstract

In the present study, the thermal performance of a microchannel with rectangular, triangular and circular shaped wall-mounted blocks on the top and bottom walls are studied numerically using hybrid nanofluids (Cu+Al/water, Cu+Al2O3/water, Ag+CuO/water, Ag+Al2O3/water) and ionic Nanofluid (Al2O3/[C4mim] [NTf2]). A constant Reynolds number equal to 10, volume fraction for first and second nanoparticle as 0.1 and 0.05 respectively, wall temperature of 27°C and coolant inlet temperature of 20°C are considered. The microchannel with triangular block showed maximum heat transfer performance. The Nusselt number of the microchannel with triangular blocks and nozzle at the inlet was enhanced by 145.76%. The maximum Nusselt number has been found for (Ag+Al2O3)/water hybrid nanofluid which is 13.8 %, 30 %, 37.12 % and 640 % greater as compared to (Ag+CuO)/water, (Cu+ Al2O3)/water, (Cu+ Al)/water and base fluid respectively. The microchannel with ionic nanofluid enhanced by 208 % as compared to water.