Uniformity of Flow and Heat Transfer Distribution in Minichannel Heat Exchanger Slab: A Numerical Approach

Mohammed Ismail, Shahram Fotowat, and Amir Fartaj


Numerical simulation, uniformity, distribution, entrance effect, minichannel slab


A three-dimensional numerical analysis of heat and mass transfer during cooling of automotive fluids, including automatic transmission fluid, ethylene glycol, and water is performed in a multiport serpentine minichannel heat exchanger. The simulations are carried out with eight CPUs having 64GB of RAM using ANSYS FLUENT version 14.5, a finite volume method based commercial CFD code. Three-dimensional double precision pressure-based absolute velocity formulation with parallel processing is utilized. Air inlet temperature of 14°C and mass flow rate of 507g/s are used to cool the hot working liquids having temperature of 76°C. Both Two different flow rates of working liquids: constant mass flux of 1423kg/m2.s and constant Reynolds number of 200 are considered in current study. Thermal and flow fields during the cooling process all over the MICHX and different channels are determined. Furthermore, the entrance effect on mass and heat transfer are studied. Distribution of flow, as well as heat transfer is found to be more uniform for ATF with compared to ethylene glycol and water. It is also observed that entrance effect on mass flow rate of water is more obvious than other two working liquids.

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