Numerical study of the effect of micro-pin-fin shape on flow heat transfer
In order to study the effect of different pin-fin cross-section shapes on the flow and heat transfer of the micro-pin-fin heat exchanger,CFD simulation software was used to numerically simulate the velocity and temperature fields of the mi-cro-pin-fin heat exchanger with five pin-fin cross-section shapes,namely rhombic,semi-rhombic-front,semi-rhombic-back,triangular-front,and triangular-back in the same working condition.The performances of micro pin-fin heat ex-changer were evaluated based on using parameters of the coefficient of friction,Nusselt number and the integrated evaluation fac-tor CPE.The results show that the pin-fin shape with a planar structure on the flow-facing surface has a stronger perturbation effect on the fluid,which leads to a stronger convective heat transfer capability,but at the same time brings about a larger pres-sure drop and frictional resistance loss.In the comprehensive evaluation,in the range of Reynolds number from 200 to 300,the triangular-front micro-pin-fin heat exchanger has the highest comprehensive evaluation factor,and in the range of Reynolds number from 300 to 1 000,the semi-rhombic-back micro-pin-fin heat exchanger has the highest comprehensive evaluation factor.
Micro-pin-finHeat sinkNumerical simulationFlow and heat transferCharacteristics
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