【摘 要】
：
This experimental work investigates the evaporation rates of liquids(water,ethanol)and the flow induced thereby for both pendant and sessile droplets in hig
【机 构】
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Department of Mechanical Engineering and National Centre for Combustion Research and Development,IIT
【出 处】
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13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
This experimental work investigates the evaporation rates of liquids(water,ethanol)and the flow induced thereby for both pendant and sessile droplets in high density ambient gas(sulfur hexafluoride).The flow induced around an evaporating droplet is studied at ambient pressure,in a sealed glass chamber.A steel needle and aluminium substrate are used for the pendant and sessile droplet study,respectively.The evaporation rates of the droplets are measured using shadow imaging technique.Particle image velocimetry(PIV)technique is used to measure the flow induced around the evaporating droplet.This flow is observed for both water and ethanol droplets.The flow moves upward for both pendant and sessile droplets of ethanol.In case of water,the pendant droplet induces a flow which is initially upward,but with time,its direction changes downward.The evaporation-induced flow for a sessile droplet of water is however always in the upward direction.This indicates the relative role of thermal and solutal buoyancy in the genesis of the flow.Droplet surface temperatures are also measured and discussed in this paper.
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