Numerical Simulation Research On The Performance Of A New Type Of Combined Tube Grid Heat Pipe Diffusion Device

Based on the rapid development of performance,integration,and modularization of power equipment,problems such as excessive heat flux density and uneven temperature distribution of high-power modules have resulted in damage to the equipment or permanent deformation caused by thermal stress generated by heat inside the equipment.Therefore,higher requirements are put forward for the heat transfer performance and temperature uniformity of thermal diffusion here.In practical equipment applications,metal diffusion devices are usually used to diffuse heat,which has disadvantages such as poor temperature uniformity,small heat dissipation,and difficulty in integrating with heating elements.The heat generated by the heat source will accumulate locally on the thermal diffusion device and cannot be it is transmitted in time,resulting in a hot spot phenomenon,which affects the service life and working stability of the high-power module.The heat pipe is a heat transfer unit with ultra-high heat transfer efficiency.It has excellent temperature uniformity and fast thermal response.The heat diffusion device added with the heat pipe scheme can greatly reduce the temperature gradient and improve the heat transfer efficiency.With the rapid development of scientific research technology in the past few decades,different types and functions of heat pipes have been invented and played an important role in different application fields.In view of the heat diffusion problem of high-power modules,a new type of combined tube grid heat pipe diffusion device is proposed.Heat pipes are set in the aluminum metal plate.According to the phase change heat transfer theory,the performance and uniformity of the heat transfer process of the heat diffusion device are optimized.In this thesis,the simulation and numerical simulation of heat transfer process and the theoretical analysis of heat transfer are carried out on the new combined tube grid heat pipe diffusion device.The main research overview is as follows:(1)The numerical calculation model of a new type of combined tube grid heat pipe diffusion device is established in this thesis.The physical model was established with Solid Works software,and the ICEPAK software was used for simulation to explore the heat diffusion performance of the combined tube grid heat pipe diffuser plate device under different heating power,different wind speed conditions and after adding fins or fins.The simulation is carried out with the heat transfer model of the metal aluminum diffuser plate of equal thickness,the center temperature of the heat source and the maximum temperature difference and temperature distribution on the diffuser plate are compared,and the influence of the three schemes on the heat transfer performance of the combined tube grid heat pipe diffuser plate is analyzed.,the optimal heat pipe arrangement structure and plate heat pipe position were determined,and the influence of different design parameters on the heat transfer performance of the diffuser plate was discussed with the help of numerical analysis results.The performance parameters are optimized and improved.Through the analysis of the temperature distribution cloud diagram and heat transfer mechanism of the new combined tube grid heat pipe diffusion device,the heat transfer performance and the advantages of the uniform temperature characteristics of the new combined tube grid heat pipe diffusion device are obtained,and the heat transfer of thermal diffusion is revealed mechanism.(2)The heat transfer mechanism and performance of the new combined tube grid heat pipe diffusion device under working conditions are discussed.After numerical simulation research,theoretical analysis and experimental verification,the results show that the new combined tube grid heat pipe diffusion device has excellent performance.temperature characteristics and heat transfer performance.When the heat source power is 100 W,the transient thermal response of the new combined tube grid heat pipe diffusion device is 49.73 ℃ after the central temperature of the heat source reaches a stable state,and the combined tube grid heat pipe diffusion device needs 2500 s to reach a stable state.With the continuous increase of the wind speed,the temperature of the center of the heat source decreased significantly,and the rate of change of the thermal resistance gradually decreased.When the power of the heat source continued to increase,the effect of the wind speed over 3 m/s on the diffusion thermal resistance was small.Considering factors such as noise and energy saving,the optimal wind speed is 3 m/s.When the heat source power increases,the diffusion thermal resistance and total thermal resistance of the combined tube grid heat pipe diffusion device tend to decrease.When the heat source power is 100 W and the wind speed is 3 m/s,the diffusion thermal resistance is 0.01168 ℃/W,and the total thermal resistance is 0.03358 ℃/W.