Abstract
It is of great significance to investigate the rising behavior of a bubble in immiscible fluids in chemical and metallurgical engineering. A 3-D model is established and the free-floating behavior of a single bubble in immiscible fluids (water-heavier liquid and biodiesel-lighter liquid) is numerically simulated by phase-field method. After the fluctuation of a certain distance, the bubble tends to be stable. It takes more time for the larger bubble to reach a stable shape than for the smaller one. The terminal aspect ratio of bubble, ET, with the same size in heavier liquid is smaller than that in lighter liquid. With the increase of bubble size, ET becomes small both in heavier and lighter liquid. Comparing bubble vortex diagrams of different shapes shows that the maximum vortex intensity is the direction in which the bubble shape extends. When the bubble passes through the liquid-liquid interface, it will form ?pear?, ?inverted pear?, ?convex?, and ?water drop? shapes successively.
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