Abstract
Numerical simulation using the coupled level set and volume of fluid (CLSVOF) method was conducted to study the coalescence dynamics of two different-sized drops of miscible liquids. Effects of surface tension ratio, Ohnesorge number (Oh), and diameter ratio on three pinch-off regimes: first- and second-stage, and no pinch-off, are examined. Partial coalescence is characterized by its appearance, disappearance, and subsequent reappearance as the surface tension ratio decreases. A regime map of distinct coalescence outcomes is constructed for different surface tension ratios, where the critical surface tension ratio required for partial coalescence increases monotonically with an increase in Oh.
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