Analysis of the interfacial instability and the patterns of rollover in multi-component layered system

Rollover was always observed in multi-component system. The effect of initial buoyancy ratio on interfacial instability and the patterns of rollover in two-layer stratified system were researched by means of experiment and simulation. The results indicated that the heat accumulated in bottom layer would be balanced by the cold liquid above the interface as the interface descended. Under lower buoyancy ratio, the interface was easily penetrated by the floating flow along the sidewall, and then W-type field of solute can be observed. With the increase of initial buoyancy ratio, bottom liquid could accumulate more energy, but it was difficult to float directly to the liquid surface. Meanwhile the Y-type and Hourglass-type profiles were presented successively. Therefore it cannot be arbitrarily concluded that the rollover pattern under higher buoyancy ratio was more dangerous in multi-component layered system.