We focus on coalescence phenomena of liquid droplets with/without suspended particles in confined geometry; in a horizontal creeping tube flow and in a vertical tube in a quiescent fluid. Correlation between the droplets’ size and the coalescence time (i.e., period between instances when the relative velocity of two droplets becomes zero after their contact and when the coalescence takes place) are examined. Effects of suspended particles in the droplets on their coalescence are discussed.

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