Topology optimization and performance research of microchannel heat exchangers
The structure topology optimization of the heat exchanger transforms the design problem of enhancing heat transfer into a mathematical optimization problem,which is important in finding novel design for high performance heat exchanger.However,it is difficult for the topology optimization mathematical model to directly explain the geometric characteristics of the optimization results and the corresponding strengthening mechanism.The topology optimization design is conducted for the heat transfer enhancement of microchannel heat exchanger.The impacts of different factors on the optimized structures and heat transfer performance are investigated.The optimization results show that the channels of the topology-optimized heat exchanger present a"hierarchical bifurcation"configuration,and the number of bifurcations increases with the increase of the inlet Reynolds number,the vertical heat transfer of fins,and the Prandtl number of liquid.Based on these findings,entransy dissipation theory and boundary layer theory are applied to reveal the mechanism of heat transfer enhancement,which provided new ideas for the structural strengthening design of the heat exchanger.
optimal designmicrochanneltransport processeshierarchical channel patternboundary layer theory
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