Research On The Structure Of Microchannel For Heat Dissipation And Uniform Temperature

With the development of science and technology,the precision demand of the highend equipment is higher and higher,especially the electronic devices are increasingly sensitive to temperature changes.Equipment such as radar TR module,has requirement for both maximum temperature and temperature differences.The cold plate design based on the microchannel has been able to meet the needs of the temperature limit,however large temperature difference between devices will still impact on the performance of equipment,therefore,the demand of uniform-temperature design has been paid more and more attention.Based on the research of rhomboid snowflake configuration,two optimization directions of constant temperature and variable size are proposed in this paper according to the design idea of unitized flow channel.In the direction of constant temperature,a three-stage layered micro-channel structure with water supply at the bottom is designed,and a good uniform temperature and heat dissipation effect can be achieved through flow control;In the direction of variable size,a micro-channel structure with gradual size is designed to achieve better temperature uniformity at the hot surface.The construction of the uniform temperature and heat dissipation test system was completed,the machining and testing of a three-stage laminated micro-channel cold plate were completed.The specific work is as follows:According to the convection heat transfer formula,the influence of different factors in the flow channel on the heat dissipation capacity was explored.Copper was selected as the flow channel material,and deionized water was selected as the fluid working medium.Finally,the rhombus snowflake was selected as the basic configuration.In the design of constant temperature,a three-stage structure with water supply at the bottom was determined according to the space limitation.The flow channel was divided into three sections for water supply.A good uniform temperature and heat dissipation capacity was achieved by flow control,and then point heat source was used to simulate a general scene,and the uniform temperature and heat dissipation performance of the cold plate in this scenario is simulated.In the variable size design,the three-stage hierarchical microchannel was first improved to obtain a three-stage gradual microchannel.The simulation proved the excellent temperature uniformity of the variable-size flow channel.,then analyzed the relationship curves of hot surface temperature,water temperature and distance under different runner sizes of 0.5mm-1mm,extracted points with the same hot surface temperature of different runners,and designed the size distribution of gradual runners on this basis,and then simulated The temperature response of the gradient runner under the heat source was analyzed,and the gradient runner was further improved,and the final size-graded micro-channel cold plate with good temperature uniformity was obtained.In the experimental link,a set of liquid cooling circulation heat dissipation system was designed and built,including high heat flux density heat source tooling,runner tooling,system liquid circuit,cold end heat dissipation,and testing equipment;designed and realized three-stage layered micro-channel cold plate,the processing of the threestage layered microchannel cold plate was explored and realized.The heat dissipation ability of the structure under the condition of uniform high power heat source and twopoint heat sources was tested,and it was proved that the structure has good heat dissipation ability and uniform temperature ability.