Influence of parameters in two-phase spray heat dissipation of electronic components

Abstract

The two-phase spray cooling system has the characteristics of high cooling medium utilization, strong cooling capacity, and less space, which can meet the increasing heat dissipation demand of electronic components. This paper established a two-phase spray heat transfer system with electron-fluorinated liquid perfluoro-4-methyl-2-pentene (FCM-47) as the experimental liquid. The influence of spray distance, nozzle flow characteristic coefficient, and atomization pressure difference on the spray characteristic and the heat dissipation performance of spray cooling in the boiling zone were studied. The experiment shows that the critical state will occur in advance when the spray distance is reduced to a certain height (3 mm). An optimal spray distance of 8 mm corresponds to the lowest surface temperature and maximum CHF (critical heat flux). Increasing the nozzle flow characteristic coefficient and spray pressure difference can improve the heat exchange by increasing flow. However, increasing the nozzle flow characteristic coefficient can increase CHF but has little effect on the critical temperature, and increasing the spray pressure difference can increase both the critical temperature and CHF. This is related to their effect on atomization characteristics.