Numerical study and structural optimization of microchannel flow and heat transfer characteristics of bionic homocercal fin microchannels
Motivated by the vital role of fish tail fins in fluid flow,microchannel with homocercal fin is designed.Three key structural parameters are identified:the relative length of the tail fin depression along its major axis Dt/Wch,the relative width of the tail fin bt/Wch and the angle determining the maximum height of the fin αt.The effects of structural parameters on average friction coefficient,average Nusselt number,overall performance factor,thermal resistance,and pump power of the bionic microchannel are analyzed numerically.The optimal solution to the structural parameters of the conformal caudal fin was obtained through uniform test analysis,regression fitting and genetic algorithm multi-objective optimization.The results show that the overall performance factor of the bionic homocercal fin microchannel ranges from 1.74 to 1.89,indicating significantly better comprehensive heat transfer performance compared to the rectangular smooth channel.Increasing the relative length Dt/Wch and angle αt and decreasing width bt/Wch improves the microchannel's heat transfer performance,with the relative length Dt/Wch and the angle αt having the greatest influence.Optimal microchannel performance is achieved when the structural parameters are Dt/Wch=0.476,bt/Wch=0.135,and αt=146.96°.
microchanneltail finbionicnumerical simulationheat transfer
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