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DOI: 10.1615/HeatTransRes.2018025786
pages 361-380

THE EFFECT OF MAGNETIC FIELD ON COUNTERFLOWS OF NANOFLUIDS IN ADJACENT MICROCHANNELS SEPARATED BY A THIN PLATE

Y. Yalameh Ali Abadi
Mechanical Engineering, Shahrekord University, Shahrekord, Iran
Afrasiab Raisi
Engineering Faculty, Shahrekord University, Shahrekord, PO Box 115, Iran
Behzad Ghasemi
Engineering Faculty, Shahrekord University, Shahrekord, PO Box 115, Iran

ABSTRACT

This study examines forced convection heat transfer between two hot and cold nanofluid laminar counterflows in a pair of adjacent horizontal microchannels. The hot alumina-water nanofluid enters the upper microchannel from the left and at same time, the cold CuO-water nanofluid enters the lower microchannel from the right. Heat exchange takes place between the hot and cold flows along the microchannels through the intermediate plate. The governing equations became algebraic using control volume method, and they are simultaneously solved using the SIMPLE algorithm. The results show that an increase in Reynolds number results in a rise in the heat transfer rate between the two flows in the microchannels. The Lorentz force generated by the magnetic field reduces the velocity of the flows in the core of the microchannels. Due to the constant mass flow rate, a velocity decrease at the center of the microchannels results in an increase in the velocity near the walls. Therefore, the heat exchange rate between the hot and cold flows is enhanced with increasing Hartmann number, especially at high Reynolds numbers. Also, due to the better thermal conductivity of nanofluids, an increase in the volume fraction of the nanoparticles leads to an increase in the heat transfer rate.


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