Interaction of Liquid Droplets in Gas and Vapor Flows

A. V. Demidovich, S. S. Kralinova, P. P. Tkachenko, N. E. Shlegel and R. S. Volkov
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A. V. Demidovich: Power Engineering School, National Research Tomsk Polytechnic University, Tomsk 634050, Russia
S. S. Kralinova: Power Engineering School, National Research Tomsk Polytechnic University, Tomsk 634050, Russia
P. P. Tkachenko: Power Engineering School, National Research Tomsk Polytechnic University, Tomsk 634050, Russia
N. E. Shlegel: Power Engineering School, National Research Tomsk Polytechnic University, Tomsk 634050, Russia
R. S. Volkov: Power Engineering School, National Research Tomsk Polytechnic University, Tomsk 634050, Russia

Energies, 2019, vol. 12, issue 22, 1-24

Abstract: We investigated the conditions, characteristics, and outcomes of liquid droplet interaction in the gas medium using video frame processing. The frequency of different droplet collision outcomes and their characteristics were determined. Four interaction regimes were identified: bounce, separation, coalescence, and disruption. Collision regime maps were drawn up using the Weber, Reynolds, Ohnesorge, Laplace, and capillary numbers, as well as dimensionless linear and angular parameters of interaction. Significant differences were established between interaction maps under ideal conditions (two droplets colliding without a possible impact of the neighboring ones) and collision of droplets as aerosol elements. It was shown that the Weber number could not be the only criterion for changing the collision mode, and sizes and concentration of droplets in aerosols influence collision modes. It was established that collisions of droplets in a gaseous medium could lead to an increase in the liquid surface area by 1.5–5 times. Such a large-scale change in the surface area of the liquid significantly intensifies heat transfer and phase transformations in energy systems.

Keywords: aerosol; gas and vapor flows; droplets; collisions; interaction regime maps; relative droplet concentration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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