Study On Performance Of Non-linear Enhanced Heat Transfer Uniform Temperature Liquid Cooling Plate

With the development of power electronic equipment towards to the miniaturization and high integration,the electronic devices is also confronted with the problems of high heat flux and temperature non-uniformity.During the operation of power electronic equipment,the larger fluctuation and non-uniformity of temperature will cause excessive or uneven thermal stress,which will lead to packaging materials fatigue failure and reduction of reliability and lifespan of power electronic equipment.To solve these challenges for power electronic equipment with the high heat flux,a design method of uniform temperature liquid cooling plate with non-linear enhanced heat transfer is proposed.Besides,based on the parameters of a certain power component radiator,the flow characteristics and heat transfer of cooling plate are analyzed by numerical and experimental method,and the design of the cooling plate is also optimized by CFD simulation method.The main contents of this paper are as follows:Firstly,the thermal design method of liquid cooling channel with non-linear enhanced heat transfer was proposed based on the theory of the wall type heat transfer.The elliptical fin and cylindrical fin were employed to enhance the heat transfer of the flow channel,and the corresponding thermal design program was developed.Then,the coupled heat transfer model in the cylinder finned heat exchanger was established and numerically calculated by CFD method.The results showed that the temperature distribution on the heating surface is more uniform by using cylindrical fins than that by using the straight fins,which certifies that the design method of liquid cooling channel with non-linear enhanced heat transfer is feasible.However,the flow resistance of the cylinder finned heat exchanger is still greater than that of the straight fin heat exchanger.Finally,the elliptical fins plate radiator was employed to enhance the heat dissipation and decrease the flow resistance.The effects of the aspect ratio of elliptical fins,the gap between fins and the area of wet circumference on the thermal resistance and flow resistance were investigated and analyzed.The research results showed that the liquid cooling radiator with elliptical fins showed a better integrated performance than that with the cylindrical or the straight fins in the aspects of temperature uniformity of the heating surface and the flow resistance.The liquid cooling radiator with elliptical fin liquid cooling plate has the lowest thermal resistance and flow resistance.