Marangoni convection: Velocity measurements using PTV method around a single vapor bubble

Abstract

An experimental investigation of the Marangoni convection around a single vapor bubble of FC-72 on a downward-facing heated surface was reported. The boiling cell used for this study was equipped with an optical measurement system which was dedicated to the Particle Tracking Velocimetry (PTV) method. This method allowed us to obtain the velocity fields in the liquid around the vapor bubble. From the velocity fields obtained, we verified the presence of Marangoni convection rolls in the vicinity of the liquid-vapor interface. Lastly, the influence of levels of subcooling on the velocity of convective rolls related to the Marangoni effect was investigated. © 2014 AFM, EDP Sciences.