Dynamic Simulation Study Of Pump-Driven Two-Phase Flow Heat Exchange System

With the rapid development of electronic technology,electronic devices tend to develop in the direction of high power and high integration.This puts new demands on the heat dissipation and cooling of electronic devices.Traditionally,conventional air-cooling,water-cooling and other conventional active/passive cooling methods cannot be used.To meet the heat dissipation requirements of electronic devices,it is urgent to adopt a new cooling and cooling method for efficient and reliable thermal management.Due to the phase change heat dissipation,the latent heat of vaporization is much larger than that of single-phase sensible heat.The gas-liquid two-phase mixture generated at the same time has a series of advantages such as small temperature fluctuation,and is widely recognized as the next generation of high-power electronic components.The development direction of the thermal solution.In this paper,the Simulink simulation analysis model of pump-driven two-phase flow cooling system is established on the Matlab platform.Based on this,the circulating medium flow,cold source temperature and evaporator table temperature unevenness which affect the cooling and cooling performance of high-power components are obtained.The parameters were analyzed in detail.In addition,considering that the pump-driven two-phase flow cooling system has a large degree of subcooling due to the inlet fluid of the evaporator,it will adversely affect the heat dissipation of high-power electronic components requiring high temperature uniformity of the evaporator table.On the basis of the conventional pump-driven two-phase flow closed heat exchange system,a jet pump mixing device capable of effectively reducing the subcooling degree of the evaporator inlet circulating fluid is added,and the pump driving of the jet pump mixing device is added under the same conditions.The two-phase flow cooling system establishes the Simulink simulation model,solves them separately and compares and analyzes them in detail,and obtains constructive comments or suggestions that are beneficial to the application of the system in engineering practice.Through the numerical simulation of the pump-driven two-phase flow cooling system and the comparative analysis of the influence of the added jet pump mixing device on the performance of the heat dissipation system,the following conclusions can be obtained:(1)Under the same conditions,the numerical analysis results of the pump-driven two-phase flow heat dissipation system established in this paper are basically consistent with the experimental results,which verifies the correctness and reliability of the pump-driven two-phase flow heat transfer system analysis model discussed in this paper.(2)Under the given thermal load conditions,the pump-driven two-phase flow heat dissipation numerical simulation system established in this paper can be started smoothly and stably.During the whole startup process,there is no temperature fluctuation on the evaporator table;(3)Through the numerical simulation analysis of the key parameters affecting the heat dissipation system,it is found that the evaporator heat load and the condenser cold source temperature have a great influence on the operating temperature of the whole heat exchange system.However,the effect of the circulating medium flow on the system operating temperature is better.small;(4)By comparing and analyzing the performance of the heat exchange system before and after adding the jet pump mixing device,it is found that after adding the jet pump mixing device,the subcooling degree of the circulating working fluid at the inlet of the heat dissipating system evaporator can be significantly reduced,so that the evaporator table The temperature unevenness on the upper side is effectively improved.