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Stretching of viscoelastic drops in steady sliding.
Soft Matter. 2017 May 03; 13(17):3116-3124.SM

Abstract

The sliding of non-Newtonian drops down planar surfaces results in a complex, entangled balance between interfacial forces and non-linear viscous dissipation, which has been scarcely inspected. In particular, a detailed understanding of the role played by the polymer flexibility and the resulting elasticity of the polymer solution is still lacking. To this aim, we have considered polyacrylamide (PAA) solutions of different molecular weights, suspended either in water or in glycerol/water mixtures. In contrast to drops of stiff polymers, drops of flexible polymers exhibit a remarkable elongation in steady sliding. This difference is most likely attributed to variation of viscous bending as a consequence of variation of shear thinning. Moreover, an "optimal elasticity" of the polymer seems to be required for this drop elongation to be visible. We have complemented experimental results with numerical simulations of a viscoelastic FENE-P drop. This has been a decisive step to unraveling how a change of the elastic parameters (e.g. polymer relaxation time, maximum extensibility) affects the dimensionless sliding velocity.

Authors+Show Affiliations

Dipartimento di Fisica e Astronomia "Galileo Galilei"- DFA, Università di Padova, via Marzolo, 8-35131 Padova PD, Italy. matteo.pierno@unipd.it.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28393163

Citation

Varagnolo, Silvia, et al. "Stretching of Viscoelastic Drops in Steady Sliding." Soft Matter, vol. 13, no. 17, 2017, pp. 3116-3124.
Varagnolo S, Filippi D, Mistura G, et al. Stretching of viscoelastic drops in steady sliding. Soft Matter. 2017;13(17):3116-3124.
Varagnolo, S., Filippi, D., Mistura, G., Pierno, M., & Sbragaglia, M. (2017). Stretching of viscoelastic drops in steady sliding. Soft Matter, 13(17), 3116-3124. https://doi.org/10.1039/c7sm00352h
Varagnolo S, et al. Stretching of Viscoelastic Drops in Steady Sliding. Soft Matter. 2017 May 3;13(17):3116-3124. PubMed PMID: 28393163.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Stretching of viscoelastic drops in steady sliding. AU - Varagnolo,Silvia, AU - Filippi,Daniele, AU - Mistura,Giampaolo, AU - Pierno,Matteo, AU - Sbragaglia,Mauro, PY - 2017/4/11/pubmed PY - 2017/4/11/medline PY - 2017/4/11/entrez SP - 3116 EP - 3124 JF - Soft matter JO - Soft Matter VL - 13 IS - 17 N2 - The sliding of non-Newtonian drops down planar surfaces results in a complex, entangled balance between interfacial forces and non-linear viscous dissipation, which has been scarcely inspected. In particular, a detailed understanding of the role played by the polymer flexibility and the resulting elasticity of the polymer solution is still lacking. To this aim, we have considered polyacrylamide (PAA) solutions of different molecular weights, suspended either in water or in glycerol/water mixtures. In contrast to drops of stiff polymers, drops of flexible polymers exhibit a remarkable elongation in steady sliding. This difference is most likely attributed to variation of viscous bending as a consequence of variation of shear thinning. Moreover, an "optimal elasticity" of the polymer seems to be required for this drop elongation to be visible. We have complemented experimental results with numerical simulations of a viscoelastic FENE-P drop. This has been a decisive step to unraveling how a change of the elastic parameters (e.g. polymer relaxation time, maximum extensibility) affects the dimensionless sliding velocity. SN - 1744-6848 UR - https://www.unboundmedicine.com/medline/citation/28393163/Stretching_of_viscoelastic_drops_in_steady_sliding L2 - https://doi.org/10.1039/c7sm00352h DB - PRIME DP - Unbound Medicine ER -
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