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, 033103Article in journal (Refereed) PublishedText
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
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:sh:diva-30194DOI: 10.1063/1.4943110ISI: 000373600600020ScopusID: 2-s2.0-84960904107OAI: oai:DiVA.org:sh-30194DiVA: diva2:932331