Heat transfer enhancement in a microchannel using a pulsating MHD hybrid nanofluid flow

By decreasing the scale of the electrical and telecommunication systems, an increasing demand to have efficient micro heat sinks have been emerged. Microchannels, therefore, have been widely investigated in recent years. The attempts to increase the thermo-hydrodynamic performance of microchannels have been developed. In the current numerical work, a micro heat sink involved two heat sources and filled with a hybrid nanofluid flow by a pulsating velocity at the inlet is investigated, aiming to manufacture more efficient micro cooling elements. Further, a magnetic field, applied on the domain intentionally or by the neighboring equipment, is considered. The transient numerical simulation shows oscillative thermal response by the same frequency of the inlet excitation. The results show heat transfer augmentation by rising the strength of magnetic field or Reynolds number. This is such that the heat transfer is intensified by a factor of 3.5 and 1.2, respectively, if the Reynolds number rises from 100 to 500 and Hartmann number from 0 to 50. Increasing Strouhal number from 0.5 to 2 makes about 20% higher heat transfer with lower oscillation amplitude. Pressure drop through the microchannel is also calculated to evaluate the hydrodynamic performance.