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Rapid wetting of shear-thinning fluids
Royal Institute of Technology (KTH), Sweden.ORCID iD: 0000-0002-6189-7953
Royal Institute of Technology (KTH), Sweden.
Royal Institute of Technology (KTH), Sweden.ORCID iD: 0000-0003-4317-1726
Södertörn University. Royal Institute of Technology (KTH), Sweden.ORCID iD: 0000-0003-3336-1462
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2023 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 8, no 4, article id 043302Article in journal (Refereed) Published
Abstract [en]

Using experiments and numerical simulations, we investigate the spontaneous spreading of droplets of aqueous glycerol (Newtonian) and aqueous polymer (shear-thinning) solutions on smooth surfaces. We find that in the first millisecond the spreading of the shear-thinning solutions is identical to the spreading of water, regardless of the polymer concentration. In contrast, aqueous glycerol solutions show a different behavior, namely, a significantly slower spreading rate than water. In the initial rapid spreading phase, the dominating forces that can resist the wetting are inertial forces and contact-line friction. For the glycerol solutions, an increase in glycerol concentration effectively increases the contact-line friction, resulting in increased resistance to wetting. For the polymeric solutions, however, an increase in polymer concentration does not modify contact-line friction. As a consequence, the energy dissipation at the contact line cannot be controlled by varying the amount of additives for shear-thinning fluids. The reduction of the spreading rate of shear-thinning fluids on smooth surfaces in the rapid-wetting regime can only be achieved by increasing solvent viscosity. Our results have implications for phase-change applications where the control of the rapid spreading rate is central, such as anti-icing and soldering. 

Place, publisher, year, edition, pages
American Physical Society, 2023. Vol. 8, no 4, article id 043302
Keywords [en]
Additives, Energy dissipation, Friction, Glycerol, Non Newtonian flow, Shear flow, Wetting, Aqueous glycerols, Contact-line frictions, Inertial forces, Newtonians, Polymer concentrations, Rapid wetting, Shear thinning fluids, Shear-thinning, Smooth surface, Spreading rate, Shear thinning
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:sh:diva-51424DOI: 10.1103/PhysRevFluids.8.043302ISI: 000976356900001Scopus ID: 2-s2.0-85153845237OAI: oai:DiVA.org:sh-51424DiVA, id: diva2:1755597
Available from: 2023-05-08 Created: 2023-05-08 Last updated: 2023-05-22Bibliographically approved

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Amberg, Gustav

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Yada, SusumuTammisola, OutiAmberg, GustavBagheri, Shervin
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