Dynamic characteristics of the initial interface in stratified multi-composition liquid tanks during rollover

Density stratification and rollover have been generally seen in multi-composition liquid tanks. In this study, numerical simulation was conducted to research the dynamic characteristics of the initial interface during rollover and the inducement of interface instability in stratified multi-composition liquid. The effect of the buoyant flow on the evaporation rate, as well as the evolving process of thermal stratification and solute transport during rollover was investigated. Through the quantitative analysis of local buoyancy ratio, it has been found that the reciprocating horizontal flow and the buoyant flow with high temperature was the mainly driving effect of the interface instability in the central region and near-wall region respectively. The evaporation rate in the local region near the wall was increased significantly when the energy was carried to the liquid level by the buoyant flow. Due to the conversion between the kinetic energy and gravitational potential energy, the local convective circulation near the wall and the uneven horizontal distribution of temperature will be formed.