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ARTICLE

Complete Coalescence, Partial Bounce and Rebound: Different Regimes Resulting from the Interaction of a Free Falling Drop with a Target Fluid

Yuli D. Chashechkin, Andrey Y. Ilinykh^*

Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences, Moscow, 119526, Russia

* Corresponding Author: Andrey Y. Ilinykh. Email:

(This article belongs to the Special Issue: Hydrodynamics of a Drop)

Fluid Dynamics & Materials Processing 2020, 16(4), 801-811. https://doi.org/10.32604/fdmp.2020.09168

Received 18 November 2019; Accepted 08 April 2020; Issue published 11 August 2020

Abstract

The interaction of a falling drop (diluted aqueous solution of ink in various concentrations) with a target fluid (partially degassed tap water) has been tracked by means of high-resolution video recording and photography. The experimental setup has carefully been prepared in order to preserve the axial symmetry of initial conditions. Three regimes of interaction have been identified accordingly (depending on the drop velocity as controlled by the distance of fall): rapid droplet coalescence, rebound with the conservation of the drop volume and shape, and partial coalescence. Previous findings are recovered and confirmed, and enriched with heretofore unseen observations of complex partial coalescence. An extensive set of data is reported to support understanding of the observed dynamics and their repeatability and reproducibility. The overall study has been carried out with the express intent to spur the future development of detailed mathematical models and numerical methods suited for this kind of problems.

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