Abstract
The purpose of this paper is to experimentally investigate the motion characteristics of a single bubble rising in a thermal stratified layer. A Particle Tracking Velocimetry (PTV) technique is used for estimating the velocities of the liquid phase and bubble. The capsules of thermo-sensitive liquid crystal (TLC) are used for measuring liquid temperature. The simultaneous measurements of temperature and velocity show that the Marangoni convection leads to an increase in the bubble rise velocity and its effect is roughly independent on the bubble diameter.
