Coalescence phenomena of droplets in a tube creeping flow were examined. Coalescence time of two droplets was measured. Clearance diameter of clearance area between droplets was also measured. The coalescence time obtained experimentally is compared with semi-theoretical formulas. Trends of semi-theoretical formulas of coalescence time and those of the experiments generally agreed. Influence of Reynolds number of tube creeping flow on coalescence of droplets was investigated.

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