Analysis of effect of Marangoni convection on formation of Microbubble Emission boiling

In view of the extremely high heat transfer capability of Microbubble Emission Boiling (MEB) and the situation of unknown to its formation mechanism, a numerical investigation was carried out to compare the effects of Marangoni and buoyancy convection on the formation of MEB. This can also help researchers to understand the mechanism of the phenomenon of MEB. It is indicated that Marangoni convection has a much higher effect than the natural convection in the region around the vapor film. At subcooling of 40K and wall superheating of 80K, the average velocities caused by Marangoni effect and gravity are 0.4 m/s and 0.01 m/s, respectively. All of these indicated that Marangoni convection plays a key role in triggering MEB and enhancing the heat transfer process involved. (authors)