| Improving the comprehensive performance of microchannel radiator has always been a research hotspot.This paper starts with bionic structure research and parameter optimization,and develops the structural optimization system software of microchannel radiator for optimization convenience.Firstly,according to the structural characteristics of natural cobweb,the cobweb microchannels with regular hexagon,regular octagon,regular decagonal,regular dodecagonal,regular tetragonal and circular structure are simplified and designed.By means of numerical simulation,the effects of shape structure,diagonal channel and main channel width on the performance of cobweb microchannel are explored by taking the maximum temperature Tmax of heating surface and the pressure difference P at the inlet and outlet of microchannel as the evaluation criteria.Secondly,taking the decagonal cobweb structure as an example.The RSM is employed to build a relationship formula among the design parameters（slot width,slot depth,fin width）and the optimization objectives（temperature,pressure drop）,and the optimal solution is solved by GA compared with MOPSO.the effects of single factor and multifactor on the optimization target are analyzed respectively.The results show that the shape structure,diagonal channel and main channel width have an impact on the heat dissipation performance and pressure drop loss of the spider web microchannel,The reasons can be due to the fluid flow rate,the degree of fluid mixing and the area of convective heat transfer,etc.（1）The increase of the number of sides can improve the thermal dissipation capacity of the microchannel,but the pressure drop will also rise.When the number of sides grows to ten,the maximum temperature also exhibits a decreasing trend,but the decrease is small,The maximum temperature of the circular cobweb structure is not the lowest as expected,but increases.In addition,the external structure has no obvious effect on the temperature distribution.（2）Diagonal channels can improve the heat dissipation performance,but also greatly improve the pressure drop.When the number of diagonal channels is small,it will not improve the heat dissipation performance,but reduce it.After adding diagonal channels to the circular cobweb structure,the maximum temperature is the lowest among these structures.In addition,adding diagonal channels can improve the temperature distribution.（3）The width of the main channel has a great impact on the heat dissipation performance and pressure drop of the microchannel.The maximum temperature decreases with the decrease of the width,and the pressure drop increases with the decrease of the width.The decrease of the width of the main channel reduces the area of the high-temperature area at the outlet of the microchannel,and the low-temperature area at the inlet expands to the left and right.The results of parameter optimization show that:（1）the fitted function can accurately describe the relationship between design parameters and optimization objectives.（2）Slot width,fin width and slot depth have significant effects on temperature,slot width and fin width have significant effects on pressure drop,among which slot width has the most significant effect on them,and the interaction between slot width and fin width on temperature and pressure drop is significant.（3）The performance of GA is better than MO PSO,and its optimization result is more comprehensive,and Compared with the non optimized structure,the maximum temperature of the optimized structure is significantly lower,the low temperature area is larger,and the temperature distribution is also more even. |
