Numerical investigation of a microchannel heat exchanger with different cross sections in transition flow regime

Numerical investigation of a microchannel heat exchanger with different cross sections in transition flow regime

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Publishing year : 2012

Conference : The first Iranian Heat and Mass Transfer Conference

Number of pages : 6

Abstract: There are various geometries that can be used in making a microchannel heat exchanger (MCHE). Such geometries have remarkable effects on the thermal and hydrodynamic performance of the MCHE. In this paper, the effects of channel size and geometry on the performance of a counter flow microchannel heat exchangers (CFMCHE) are investigated numerically. The flow regime is considered to be 3D in the flow in transitional regime. Various channels with different cross-sections are investigated for the same overall volume of MCHE in the transitional flow regimes. Typical results are also compared with available studies for specific geometries in the laminar flow regime. Using validated numerical simulation, MCHE's heat transfer performance and pressure drop for each geometry are determined and discussed. Results show that increasing the number of channels results in increasing both the efficiency and the pressure drop. Comparison of the results also illustrates that the microchannel with circular cross section seems to have the best overall thermal and hydraulic performance among the studied geometries