Design Simulation And Experimental Study Of 20W Thermal Load Pulsating Heat Pipe

With the rapid development of the information age,the power of electronic components continues to increase,and the development of miniaturization,compactness,and high performance directly affects the performance and life of electronic components.Therefore,the use of good heat dissipation is of vital importance to the development of electronic technology.A pulsating heat pipe is a new type of heat pipe that is different from a conventional heat pipe.It has a simple structure,can operate under anti-gravity conditions,and has a certain load-resistance.It has broad application prospects in the field of miniaturization,high-power electronic equipment and equipment cooling.There are many factors affecting the heat transfer performance of pulsating heat pipe.In this paper,the heat dissipation 20 W chip heat dissipation model is used as the model.For the rectangular cross-sectional shape of the channel and the circular pulsating heat pipe as the research object,the shape and internal pipe structure of the pulsating heat pipe are designed according to the heat dissipation requirements of the chip;A physical model of the pulsating heat pipe was established.The equivalent thermal conductivity method was used to simulate the pulsating heat pipe under natural convection,cold end and high temperature conditions,which provided data support for the experimental test.According to the simulation results,the heat transfer performance of rectangular and circular pulsating heat pipes under natural convection,cold end and high temperature conditions was studied experimentally.Finally,the convective heat transfer coefficient between the pulsating heat pipe and the environment under different working conditions is obtained by comparing the experimental data with the simulated data,and the applicable conditions of the equivalent thermal conductivity method are verified.Through the simulation results and experimental results,it can be concluded that the heat transfer performance of the rectangular tube is better than that of the circular tube in the case of complete pulsation of the working medium of the pulsating heat pipe,and the contrast effect is obvious in the high power area;vertical placement is conducive to improving the performance of pulsating heat pipe,pulsating heat pipe can also play a good heat transfer performance at high temperature.For the low power state of the cold end,the pulsating heat pipe can not start;the equivalent thermal conductivity method is applied to the complete pulsation of the working fluid in the pulsating heat pipe,and the convective heat transfer coefficient of the environment and the pulsating heat pipe under natural convection and high temperature conditions is derived.