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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Poster Session I

CPP 24.37: Poster

Montag, 16. März 2020, 17:30–19:30, P3

Influence of Wavy-Interface on the Dynamics of Drop-Interface Coalescence — •Kuntal Patel — Indian Institute of Technology, Bombay, India

In drop-interface type coalescence, when a droplet is placed gently on a liquid pool, it will try to merge with the liquid pool (by draining the liquid within the droplet into the pool), which may result in either partial or complete coalescence. It primarily depends on the relative competition among the surface tension, viscous resistance, and gravity [1]. In present work, we perform numerical simulations using the ghost-fluid method based sharp-interface level-set method [2] to study the coalescence dynamics of an ethanol droplet (of diameter 1.07 mm) with a wavy pool of ethanol (surrounded by air).

Numerical experiments show that the dual coalescence-cascade pattern observed with a planar ethanol pool gets altered in the case of a wavy pool. This deviation in the coalescence dynamics is attributed to the complex interaction between two different capillary waves, one originated due to the coalescence, and other from the waviness of the ethanol pool. We demonstrate the transition from dual coalescence-cascade to single and zero coalescence-cascade (i.e., complete coalescence) for different waviness (defined here using amplitude and frequency) of ethanol pool.

[1] B. Ray, et al., Journal of Fluid Mechanics 655, 72-104 (2010).

[2] J. Shaikh, et al., Chemical Engineering Science 176, 77-95 (2018).