Laboratory measurements of the effect of charge on coalescence and temporary coalescence of small raindrops

Details Laboratory measurements of the effect of charge on coalescence and temporary coalescence of small raindrops Laboratory measurements of the effect of charge on coalescence and temporary coalescence of small raindrops

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aipc..197...18c&link_type=abstract

Drops and bubbles: third international colloquium. AIP Conference Proceedings, Volume 197, pp. 18-29 (1990).

Physics

Water In The Atmosphere, Cloud Physics And Chemistry

Scientific paper

The first measurements of the effects of charge on the coalescence of small precipitation drops initially at terminal velocity in widely separated pairs have been obtained in a laboratory experiment. Observations were taken for a small drop (190 μm radius) with a constant positive charge interacting with a larger drop (340 μm radius) with both positive and negative charge. Data were also obtained for both drops carrying minimal charge and for a case with the small drop having a larger positive charge. Coalescence, bounce, temporary coalescence and temporary coalescence with satellites were observed. The results indicate that || QR-Qr || may be adequate to characterize the outcomes of drop collisions. New features of charged drop interactions were also observed: a unique impact angle dividing the coalescence from the non-coalescence region that is independent of charge; a two-order of magnitude range of relative charge between drop bounce and complete charge-induced coalescence; a wide range of charge where a satellite drop occurs with temporary coalescence; and at higher charge levels, the beginning of charge-induced permanent coalescence at the most grazing collisions.

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