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Analysis of the Marangoni Effect in Volatile Liquids Evaporating from Capillary Tubes Using a New Interface Tracking Method

A new computational liquid/vapor interface tracking technique is developed to model an interface between a liquid and a vapor including mass transfer. This technique does not require the use of an additional transport equation, as does the volume-of-fluid (VOF) method, while still being implemented without a complicated solution procedure. This new interface tracking technique is used to capture the liquid/vapor interface in a capillary tube of 100-μm scale. The diffusion-driven evaporation process is studied, along with the Marangoni convection that is caused by the temperature gradient along the interface. The results are qualitatively and quantitatively compared to existing experimental data.