THERMAL EFFECT IN THE EVAPORATION PROCESS FROM THE INTERFACE OF THE HORIZONTAL LIQUID LAYER UNDER A SHEAR GAS FLOW

This manuscript presents the experimental study of interfacial motion and convection in a horizontal liquid layer (ethanol and HFE 7100) evaporating from a localized surface (10 × 10 mm²) into the gas flow (dry air). The novel IR-Schlieren system has been developed. The system can almost simultaneously maintain the gas-liquid interface in a flat position in a confined square area and perform thermal imaging of the volatile liquid surface by IR camera. We consider the thermal effect of gas and liquid temperature (20°C-50°C) for various gas velocities (0.0138-0.138 m/s) on interfacial liquid motion and their influence on the convective flow structure within the liquid layer. It is found that the influence of the gas flow action on the Marangoni convection at the interface is reduced with an increase in temperature. We explain this fact by the growth of the diffusion resistance for the gas flow under a strong evaporation from the interface.