Research And Optimization Analysis Of Bionic Microchannel Heat Sink To Enhance Heat Transfer

With the wide application of network technology,microelectronic chips are developing towards high integration,compactness and high efficiency.High temperature hot spots are formed in electronic chips due to high heat flux and uneven heat dissipation,resulting in the damage of components.In order to effectively improve the heat dissipation effect of electronic components,in this paper,referring to the high-quality bionic network structure of heat and mass transfer in nature,using deionized water as the flow medium,the heat sink models of flat microchannel,leaf vein microchannel and spider web microchannel are constructed,and the CFD software is used for numerical simulation.The physical field of each microchannel model is obtained to analyze the heat transfer and flow characteristics of microchannels with different structures,and the theoretical analysis of microchannels with different structures is carried out by combining the field synergy theory and entransy dissipation theory,which provides a theoretical basis for optimizing the structure of microchannel heat sink.The results of numerical simulation are as follows,(1)Under the same microchannel coverage area,the heat transfer effect of spider web microchannel heat sink is the best,the synergistic effect of temperature field and velocity field is the best,the heat transfer efficiency is the highest,and the heat transfer and flow characteristics are the best;(2)Based on the spider web microchannel,with the increase of the heating power of the electronic chip,the average temperature of the heat sink gradually increases,the viscosity of the fluid decreases,the heat transfer effect becomes better,the coordination degree of the temperature field and the velocity field increases,but the energy dissipation increases,the heat transfer efficiency decreases,and the flow characteristics become better;(3)In the range of laminar flow,the change of spacing ratio of spider web microchannel has a certain effect on heat dissipation.When the spacing ratio is 1.15,the heat sink has the lowest temperature,the best heat transfer effect,the highest coordination degree of temperature field and velocity field,the highest heat transfer efficiency and the better flow characteristics;(4)Based on the hexagonal spider web microchannel,the effect of increasing the number of sides on the heat transfer and flow characteristics of spider web microchannel is analyzed.The results show that:when the number of edges of the positive n-shape of the spider web microchannel is 6,the microchannel has the smallest average temperature(Tave),the largest Nusselt number(Nu),the smallest dissipation value(Evh)and the largest field synergy number(Fc),and the pressure drop at the inlet and outlet decreases with the increase of the number of edges of the positive n-shape.When the microchannel is circular,it has the smallest inlet and outlet pressure drop and the least resistance.