Abstract
An experimental study on dynamic behavior of a thermal stratification in a tank was carried out. The temperature and flow fields were visualized by using the liquid crystal tracer, and the dynamic phenomena of the thermal stratification and the thermal plumes were recorded by VTR. When the upper wall was cooled rapidly, the cold plumes formed in the vicinity of the upper wall, moved downward and finally emerged into the thermal stratification. The liquid was well mixed by the cold plumes, and the thermal stratification disappeared.
