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