Study on the heat transfer characteristics of microchannels under the action of fin-shaped spoilers
This study employs the finite volume method(FVM)and dynamic mesh technology to simulate the active disturbance heat transfer of fin-shaped vortex generators in a three-dimensional rectangular microchannel.The simulation conditions are laminar Reynolds numbers(Re)ranging from 50 to 250,and vortex generator oscillation frequencies(f)from 10 to 50 Hz.The results indicate that the Nusselt number(Nu),friction coefficient(fr),and performance evaluation criterion(PEC)exhibit quasi-sinusoidal variations within a certain range,with a period matching that of the vortex generator oscillation.Under the conditions of Re=50 and f=10-50 Hz,the PEC ranges from 0.75 to 1.52 and increases with frequency.Especially in the low frequency range,PEC shows a certain monotonicity.By introducing fin-shaped spoilers,the heat transfer efficiency of the microchannel has been significantly improved.Compared to a smooth rectangular microchannel(PEC=1),the PEC increases by 5％at Re=50 and f=10 Hz,and by 30％at Re=50 and f=50 Hz.
dynamic gridheat transfer characteristicthermodynamicsfin-shaped spoilermicrochannelnumerical simulation
万方数据
维普
