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Sub-Newtonian coalescence in polymeric fluids

Rajput, AS and Varma, SC and Kumar, A (2023) Sub-Newtonian coalescence in polymeric fluids. In: Soft Matter .

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Official URL: https://doi.org/10.1039/d3sm00069a


We present a theoretical framework for capturing the coalescence of a pendant drop with a sessile drop in polymeric fluids. The framework is based on the unification of various constitutive laws under a high Weissenberg creeping flow limit. Our results suggest that the phenomenon comes under a new regime, namely, the sub-Newtonian regime followed by the limiting case of arrested coalescence with the arrest angle θarrest ∝ Ec−1/2−1, where Ec−1 is the inverse of Elasto-capillary number. Furthermore, we propose a new time scale T* integrating the continuum variable Ec−1 and the macromolecular parameter Ne, the entanglement density to describe the liquid neck evolution. Finally, we validate the framework with high-speed imaging experiments performed across different molecular weights of poly(ethylene oxide) (PEO).

Item Type: Journal Article
Publication: Soft Matter
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to the Author.
Keywords: Drops; Ethylene; Polyethylene oxides, Capillary numbers; Constitutive law; Creeping flows; Limiting case; Newtonians; Pendant drop; Polymeric fluid; Sessile drops; Theoretical framework; Time-scales, Coalescence
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 24 Jul 2023 13:21
Last Modified: 24 Jul 2023 13:21
URI: https://eprints.iisc.ac.in/id/eprint/82637

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