Research On Heat Transfer Performance Of Jet Impinging And Spray Cooling With Moving Nozzle

With the rapid development of the electronics industry,the integration of electronic components is getting higher and higher so that the electronic components of the heat problem is particularly important.Under the condition of high heat flux,jet impingement and spray cooling on the local heat transfer coefficient can be improved most effectively,so as to achieve better cooling effect.Therefore,how to improve the heat transfer performance of jet impingement and spray cooling process is the focus of this paper.Compared with the conventional fixed nozzle jet impingement and spray cooling,the moving nozzle is used to carry out the experiment and numerical simulation,which obviously reduces the average temperature of the heating surface,shortens the heat exchange time and improves the heat transfer capacity.In this paper,a moving nozzle jet impingement and spray cooling experiment system is designed and built.The PLC is used to realize the reciprocating movement of the nozzle at a certain speed,and the moving speed of the nozzle can be precisely controlled in real time.The effects of nozzle moving velocity on heat transfer process of jet impinging at different heat flux and flow rate were investigated.Through experimental validation,the results show that compared with fixed nozzle,moving nozzle can reduce the maximal temperature difference of heating surface and the average thickness of liquid film,resulting in a more steady heat transfer process and homogenization temperature.Moreover,moving nozzle can enhance the heat exchange capability in convection process by over 40%,and higher nozzle velocity leads to a more remarkable enhancement of heat exchange capability as well as homogeneity.At the same time,the numerical simulation of jet impingement of moving nozzles is realized by using the sliding mesh technology and the corresponding UDF.The simulation results show that the moving nozzle can better stabilize the intermediate heat transfer process of jet impingement,so that the peak temperature of the substrate surface in the jet process is obviously reduced,and the cooling time is shortened,and the heat transfer capability is enhanced to a certain extent.