Numerical Simulation Of Spray Cooling In The Single Phase Regime And Influencing Factors Analysis

The integration of electronic equipment makes the heat flow of per unit area increase rapidly.To solve the problem of heat dissipation of electronic devices,the scholars have conducted a large number of inquiry.They find that spray cooling is an effective way for current and future application.To explore the effect of spray cooling,this paper would present research and detailed analysis by means of experiment and numerical simulation.In this paper,experimental test of spray cooling and FLUENT numerical simulation were made to explore the influence factors of unsaturated temperature spray cooling.The specific contents are just as follows:(1)An experimental scheme of spray cooling is designed,in which the pure copper heating block is taken as the research object,and a solid cone nozzle is used with water as cooling medium.The spray cooling experiment platform is established to explore the temperature variation of the heating surface under the condition of below saturation temperature and pressure 1bar,the corresponding temperature under different heat flux is obtained and experimental verification for the following numerical simulation can be provided.(2)The physical models,including turbulent model,discrete phase model,film model and some other related models as well as boundary conditions,are established according to the experimental conditions.Due to the simulation analysis of unsaturated temperature spray cooling,the influence of environmental temperature is negligible.So the whole space and discrete phase are considered as steady-state flow field and transient flow field,respectively.At last,a better fitting effect by the simulation results compared with experimental results is obtained.(3)After the model validation,we analyze convective heat transfer coefficient and wall temperature characteristics of spray cooling in single phase region.The microcosmic mechanism of spray cooling heat transfer was analyzed from liquid film thickness and liquid film velocity.We used univariate analysis to analyze the different influencing factors different influence factors,including particle diameters,mass flow rate,spray height and spray velocity,on the spray cooling effect and explore the proportion of each influence factor.