Dynamic wetting of viscoelastic droplets
2015 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 92, no 4, 043002Article in journal (Refereed) Published
We conduct numerical experiments on spreading of viscoelastic droplets on a flat surface. Our work considers a Giesekus fluid characterized by a shear-thinning viscosity and an Oldroyd-B fluid, which is close to a Boger fluid with constant viscosity. Our results qualitatively agree with experimental observations in that both shear thinning and elasticity enhances contact line motion, and that the contact line motion of the Boger fluid obeys the Tanner-Voinov-Hoffman relation. Excluding inertia, the spreading speed shows strong dependence on rheological properties, such as the viscosity ratio between the solvent and the polymer suspension, and the polymeric relaxation time. We also discuss how elasticity can affect contact line motion. The molecular migration theory proposed in the literature is not able to explain the agreement between our simulations and experimental results.
Place, publisher, year, edition, pages
2015. Vol. 92, no 4, 043002
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:sh:diva-30195DOI: 10.1103/PhysRevE.92.043002ISI: 000362445200021ScopusID: 2-s2.0-84945179169OAI: oai:DiVA.org:sh-30195DiVA: diva2:932339