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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.258 SNIP: 0.574 CiteScore™: 0.8

ISSN Druckformat: 2169-2785
ISSN Online: 2167-857X

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2013007434
pages 51-62

COALESCENCE OF A DROPLET CLUSTER SUSPENDED OVER A LOCALLY HEATED LIQUID LAYER

Alexander A. Fedorets
The University of Tyumen, 6 Volodarsky St, Tyumen, 625003, Russia
Igor Marchuk
Institute of Thermophysics, Russian Academy of Sciences, prosp. Lavrentyev 1, Novosibirsk, Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia
Oleg A. Kabov
Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences, 1, Acad. Lavrentyev Ave., Novosibirsk, 630090, Russia; Institute of Power Engineering, National Tomsk Polytechnic Research University, 7, Usova Street, Tomsk, 634050, Russia; Novosibirsk State University, 2, Pirogova str., Novosibirsk, 630090, Russia

ABSTRAKT

Experimental results on the coalescence of a dissipative structure "droplet cluster" obtained by means of high-speed thermal imaging are presented. It is found out that coalescence of a single cluster droplet with a liquid layer can generate a capillary wave on the interphase, and propagation of this wave causes coalescence of the whole cluster during several thousandths of a second. Cluster coalescence is accompanied by a temperature jump on the interphase. With cluster restoration, the surface temperature of a liquid layer returns gradually to the initial level. The interphase temperature under the droplet cluster can be both lower and higher than the interphase temperature without this cluster, i.e., the cluster can not only initiate both heat and mass transfer between liquid and gas, but also deteriorate it.


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