THE OPTIMAL CONDITIONS FOR THE GENERATION OF HEAT FLUX THROW THE CAPILLARY CUT CAUSED BY THE ULTRASONIC CAVITATION

The present paper concerns the generation of the sonic-capillary heat flux. Its conceptual model was presented in paper [1] and based on the experimental investigation of the sonic-capillary effect. The main statements of this model are: if the capillary was immersed into liquid, where an ultrasonic field was formed, the cavitations arise near the capillary cannel and due to the sonic-capillary force are translating into the capillary. Thus, all thermodynamic processes, connected with extension of cavities need some quality of heat should be located near the capillary cannel; the decreasing of cavities and reverse of heat to liquid are located in the capillary cannel; that’s why the heat flux is form throw the open capillary section. In this paper the results of numerical investigation of the optimal conditions for the generation of the sonic-capillary heat flux are presented. Using the original program product, the influence of the cavity parameters on the heat flux is investigated. It is shown, that an ultrasonic frequency ν determines the acceptable range of the internal diameters of the capillary, and, as consequence, the permissible range of cavities radius Rmax can be also defined. The calculations cover the range ν = (20÷100) kHc, and corresponding range of cavities radius Rmax= (0,025÷0,100) mm. Also, the results of numerical investigation for the wide range of equilibrium temperature of liquid are presented. It is shown, that due to the arising of the equilibrium temperature the kinetics of vaporization changes its parameters: the vapor in cavity remains unsaturated, thus the quality of heat, transferred throw the open end of capillary, decreases. The boundary temperature for two regimes of the evaporating is caused by the ultrasonic frequency too.