Abstract
Theoretical and experimental investigations of liquid evaporation process under ultrasonic (US) and heat influences (HI) under conditions of reduced pressure are carried out. A mathematical model of the influence of US, HI and pressure of a vapor-gas mixture in a vacuum chamber (VC) on the temperature and rate of fluid evaporation is developed. A program and methods for conducting experiments have been developed, an experimental stand has been created, and an experimental program has been implemented. The experimental dependences of the change in the liquid temperature under combined US and HI under conditions of reduced pressure and under the influence of these factors were obtained separately. A comparative analysis of the calculated and experimental values of liquid temperatures was carried out, which showed a discrepancy of the results to 10%. The areas of parameters of US, HI, and pressure in a vacuum chamber are identified, at which the evaporation rate of the liquid varies significantly, for example, at a pressure of 3 ... 4.5 kPa, a sharp decrease in the liquid temperature is observed, up to the formation of ice crust. The combined use of US and HI in conditions of reduced pressure leads to an increase in the rate of liquid evaporation by 0.7 g / min than when using US and HI separately.
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