Coalescence and migration of a droplet on a liquid pool with an inclined bottom wall

Kirar, Pavan Kumar and Kolhe, Pankaj Sharadchandra and Sahu, Kirti Chandra (2022) Coalescence and migration of a droplet on a liquid pool with an inclined bottom wall. Physical Review Fluids, 7 (9). pp. 1-13. ISSN 2469-990X

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Abstract

We experimentally investigate the curvature-driven migration and coalescence of an ethanol droplet on the free surface of an ethanol pool with an inclined bottom wall by employing a high-speed shadowgraph technique. Two distinct coalescence phenomena, migrating partial coalescence and multidrop pinch-off, in addition to the normal partial coalescence and complete coalescence are observed when the Weber number (We), liquid depth at the impact point (dl/D), and inclination angle (θ) are varied. The three-phase contact line (TPCL) formed by the air-liquid interface on the inclined bottom wall and its curvature near the TPCL cause these unique dynamics. The coalescence behaviors are clearly demarcated by the regime maps drawn in dl/D-We and θ-dl/D spaces. We found that the transition between partial and complete coalescence occurs at We≈10, regardless of liquid depth, and that, for θ=18°, the influence of the inclined wall is apparent for We>2, which increases as the inclination angle increases. © 2022 American Physical Society.

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IITH Creators:

IITH Creators	ORCiD
Kolhe, Pankaj Sharadchandra	https://orcid.org/0000-0002-7930-5987
Sahu, Kirti Chandra	http://orcid.org/0000-0002-7357-1141

Item Type:

Article

Additional Information:

K.C.S. thanks the Science & Engineering Research Board, India for their financial support (Grant No. CRG/2020/000507). We are thankful to the anonymous reviewers and an associate editor for their constructive suggestions, which help us to improve the manuscript significantly. The authors report no conflict of interest.

Uncontrolled Keywords:

Bottom wall; Coalescence phenomenon; Ethanol droplet; Free surfaces; High Speed; Inclination angles; Liquid pool; Partial coalescence; Shadowgraph technique; Three-phase contact line

Subjects:

Physics > Mechanical and aerospace
Chemical Engineering

Divisions:

Department of Chemical Engineering
Department of Mechanical & Aerospace Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

06 Oct 2022 09:29

Last Modified:

06 Oct 2022 09:29

URI:

http://raiithold.iith.ac.in/id/eprint/10810