Viscoelastic droplet dynamics in a y-shaped capillary channel
2016 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 28, no 3, 033103- p.Article in journal (Refereed) Published
Non-Newtonian droplet dynamics commonly exist in microfluidic systems. We report simulations of viscoelastic (VE) droplets traveling in a two dimensional capillary bifurcation channel. A numerical system combining phase field method, VE rheology, and Stokes flow equations is built. As a generic microfluidic two-phase problem, we study how a non-Newtonian droplet that approaches a channel bifurcation will behave. We identify conditions for when a droplet will either split into two or be directed into one of the branches. In particular, we study the importance of the non-Newtonian properties. Our results reveal two different non-Newtonian mechanisms that can enhance splitting and non-splitting of droplets with respect to Newtonian droplets, depending on the size of droplet and capillary number.
Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2016. Vol. 28, no 3, 033103- p.
Research subject Engineering Mechanics
IdentifiersURN: urn:nbn:se:kth:diva-184141DOI: 10.1063/1.4943110ScopusID: 2-s2.0-84960904107OAI: oai:DiVA.org:kth-184141DiVA: diva2:914969
QC 201603292016-03-282016-03-282016-03-29Bibliographically approved