NUMERICAL INVESTIGATION OF THE LOW-PRESSURE EVAPORATIVE COOLING OF A SUBSTRATE

A mathematical model for determining the interrelationship between the velocity of motion of the evaporation front and the thermal processes in the substrate has been developed. We have calculated the values of heat fl uxes from the substrate in the process of evaporation of a fi lm of thickness several microns and femtoliter water droplets. It has been shown that the heat fl uxes in the evaporation time are of the order of 1 MW/m² . The evaporation time does not exceed 10–2 s. Approximated formulas have been obtained for estimating the values of heat fl uxes. It has been established that a decrease in pressure increases the value of the measured heat fl ux due to the decrease in the limiting temperature of the evaporation front.
   
Author:  S. P. Fisenko and Yu. A. Khodyko
Keywords:  evaporation front, free-molecular regime, film, pinning-effect, heat flux
Page:  89