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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 is studied numerically using hybrid nanofluids (Cu+Al/water, Cu+Al 2 O 3 /water, Ag+CuO/water and Ag+Al 2 O 3 /water) and ionic nanofluid (Al 2 O 3 /[C 4 mim] [NTf 2 ]). 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 a 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+Al 2 O 3 )/water hybrid nanofluid, which is 13.8, 30, 37.12 and 640% greater compared to (Ag+CuO)/water, (Cu+ Al 2 O 3 )/water, (Cu+ Al)/water and base fluid, respectively. The microchannel with the ionic nanofluid is enhanced by 208 % compared to that with water.

Numerical investigation of heat transfer performance of microchannel with wall-mounted obstacles using hybrid nanofluids