Simulation And Exeperiment Of Jet Cooling System

As electronic devices and agencies increasingly high integration devices, they produceheat into the base of growth. How to receive small space, high-heat environment, and efficientheat dissipation has become an important issue. Traditional forced natural convection heattransfer and forced convection heat transfer can no longer meet the cooling requirements .Jetcooling,as a compact, highly efficient heat exchanger means to become the focus of study.Application of jet-impingement cooling can generally be divided into two kinds: jetimpingement cooling and spray cooling. Jet impingement cooling mainly depend on thecooling pressurized refrigerant cooling wall after the collision formation of stagnation zoneand spray cooling exit the nozzle to form a relatively homogeneous group of spray droplets.This study of the main contents of jet impingement cooling and spray cooling issimulation and experimental comparative analysis:Jet impingement cooling using CFD simulations of the Eulerian two-phase flow model.Then also set the experimental design impingement system modeling and boundaryconditions. Comprehensive consideration of the gas and liquid mixing and heat transfer in jetimpingement cooling, Compute is finished by constant cool surface temperature condition andconstant surface heat flux condition. Simulation results include the impact of jet exit velocity,the jet stream type, Jet-cooled wall temperature ,heat flux distribution, the jet during thedistribution of gas-liquid two-phase volume ratio, wall heat flux and wall heat transfercoefficient increases with the increase of temperature changes in trends ,the simulation resultsis contrast with the experimental results.Spray cooling uses CFD simulation in the discrete phase model, the most widely usedsolid-cone nozzle has been simulated, simulated nozzle exit using Rosin-Rammler distributionformula definition, simulation results including the velocity distribution of droplet spraycooling droplet diameter distribution, spray cooling wall heat flux distribution, the spraycooling wall heat flux and wall heat transfer coefficient increases with the increase oftemperature changes in trends ,the simulation results is contrast with the experimental results. Jet impingement cooling experiments to measure the open and closed loop jetimpingement cooling system cooling performance-based, the jet impingement system mainlyused in compact, high-heat-density areas .The main impact of open-jet cooling system needs toprovide constant cooling refrigerant and can not be circulating cooling, closed-jet impact onthe cooling system through the fin-tube heat exchanger cooling system to complete the cycleof cooling. Experimental cooling heat use the thermocouple to measure heat flux and averageheat transfer coefficient .The jet impingement cooling system cooling capacity can becomputed by the heat flux. The experimental results showed that the amount of jetimpingement cooling system, open system can be 100 W/cm~2 of heat flux density, closedcooling system cooling capacity to between 60 W/cm~2-65 W/cm~2.