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Thermophysics and Aeromechanics

2015 year, number 4

Capillary waves at microdroplet coalescence with a liquid layer

A.A. Fedorets1,2, I.V. Marchuk2,3, P.A. Strizhak4, and O.A. Kabov3,4

1Tyumen State University, Tyumen, Russia

2Novosibirsk State University, Novosibirsk, Russia

3Kutateladze Institute of ThermophysicsВ  SB RAS, Novosibirsk, Russia

4Tomsk Polytechnic University, Tomsk, Russia

E-mail: В marchuk@itp.nsc.ru
Keywords: capillary waves, microdroplets, coalescence, droplet cluster, evaporation, condensation, liquid layer, local heating
Pages: 515–518

Abstract

The quickly damped capillary waves generated at coalescence of microdroplets (diameter of up to 100 µm), formed in a gas atmosphere at water vapor condensation, with the horizontal layer of water are studied experimentally. Evaporation takes place at intensive local heating of liquid from the substrate side. To visualize and measure the deformations, the Schlieren technique and high-speed video (up to 54000 f/s) are applied. The measured wave amplitude varies within 1-6 µm, and this is consistent with the magnitude of the surface energy of coalescing microdroplets. The waves are generated by the energy of droplet surface.

DOI: http://dx.doi.org/10.1134/S0869864315040137