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摘要
Droplet evaporation is of great significance in field of air conditioning, heat transfer enhancement and effective use of pesticides. Previous studies for theoretical modeling usually ignored the influence of airflow. Therefore, a 2D model of the evaporating droplet in flowing air was constructed using the COMSOL software in this study, reflecting the influence of flowing air on Marangoni flow, temperature distribution and evaporation rate of the droplet. The results have been verified by experiments. The results show that the evaporation rate at the top of the droplet is the largest, which creates an upward temperature gradient from the bottom of droplet, triggering the Marangoni flow. The flowing air enhanced the evaporating process and increases the mass transfer on the windward side, and the internal flow on the upwind side is stronger than the downwind side. The simulation results also showed that increasing the air velocity can reduce the average relative humidity of the air around the droplets, thereby enhancing the heat and mass transfer; increasing the temperature difference or humidity difference between the air and the droplets can increase the saturated water vapor partial pressure difference between the two, and accelerate the transfer of moisture.
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