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Universality in coalescence of polymeric fluids

Varma, SC and Saha, A and Mukherjee, S and Bandopadhyay, A and Kumar, A and Chakraborty, S (2020) Universality in coalescence of polymeric fluids. In: Soft Matter, 16 (48). pp. 10921-10927.

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Official URL: https://dx.doi.org/10.1039/d0sm01663b


A pendant drop merging with a sessile drop and subsequently forming a single daughter drop is known to exhibit complex topologies. But their dynamics are yet to be probed for fluids exhibiting characteristic relaxation time scales while undergoing the deformation process. Here, we unveil a universal temporal evolution of the neck radius of the daughter drop during the coalescence of two polymeric drops. Such a generalization does not rely on the existence of previously explored viscous and inertial dominated regimes for simpler fluids but is fundamentally premised on a unique topographical evolution with essential features of interest exclusively smaller than the dominant scales of the flow. Our findings are substantiated by a theoretical model that considers the drops under coalescence to be partially viscous and partially elastic in nature. These results are substantiated with high-speed imaging experiments on drops of polyacrylamide (PAM), polyvinyl alcohol (PVA), polyethylene oxide (PEO), and polyethylene glycol (PEG). The observations herein are expected to hold importance for a plethora of diverse processes ranging from biophysics and microfluidics to the processing of materials in a wide variety of industrial applications. This journal is © The Royal Society of Chemistry.

Item Type: Journal Article
Publication: Soft Matter
Publisher: Royal Society of Chemistry
Additional Information: Copyright to this article belongs to Royal Society of Chemistry
Keywords: Aliphatic compounds; Coalescence; Polyethylene oxides; Polyethylenes, Characteristic relaxation time; Deformation process; High speed imaging; Poly (vinyl alcohol) (PVA); Polyacrylamide(PAM); Polyethylene oxide (PEO); Theoretical modeling; Topographical evolution, Drops
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 29 Jan 2021 06:37
Last Modified: 29 Jan 2021 06:37
URI: http://eprints.iisc.ac.in/id/eprint/67710

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