Evaporation-driven Thermocapillary MarangoniConvection in Liquid Layers of Different Depths
journal contributionposted on 03.07.2018, 00:00 by A Sankaran, AL Yarin
In the experimental part, which employed infrared (IR) camera, temperature distributions at the free surface of ethanol layers in deep and shallow vessels under room temperature or subjected to heating from below in the 68 °C - 105 °C temperature range (including the ethanol boiling temperature of 78.3 °C) were studied, and correlated with the heater surface temperature. The regular and irregular Marangoni convection patterns were recognized. Light particles fully entrained by the Marangoni convection on the free surface were tracked and their velocities were measured and compared to the theoretical predictions. Namely, a model is developed for the Marangoni-driven convection due to a non-uniform evaporationrelated cooling of the free surface of a liquid in anopen vessel. In this case, an analytical solution.