Experimental evaluation of the coalescence efficiencies of colliding water drops

Zev Levin, Benjamin Machnes

Research output: Contribution to journalArticlepeer-review


The coalescence of water drops of sizes comparable to rain drops (200–2500 μm diameter) was investigated. The method used provided a good separation between collision and coalescence effects. The result suggests a dependence of the coalescence efficiency on both the size of the large drop and the ratio of the radii of the interacting drops (p-ratio). The coalescence was observed to rapidly decrease due to bouncing and partial coalescence as the angle of impact increased from head-on to grazing angle. However, some bouncing was observed at very low impact angles.
Original languageEnglish
Pages (from-to)845-867
Number of pages23
JournalPure and Applied Geophysics
Issue number4
StatePublished - 26 Apr 1977

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