Influence of the surface viscous stress on the pinch-off of free surfaces loaded with nearly-inviscid surfactants.

ABSTRACT: We analyze the breakup of a pendant water droplet loaded with SDS. The free surface minimum radius measured in the experiments is compared with that obtained from a numerical solution of the Navier-Stokes equations for different values of the shear and dilatational surface viscosities. This comparison shows the small but measurable effect of the surface viscous stresses for sufficiently small spatiotemporal distances from the breakup point, and allows to establish upper bounds for the values of the shear and dilatational viscosities. We study numerically the distribution of Marangoni and viscous stresses over the free surface as a function of the time to the pinching, and describe how surface viscous stresses grow in the pinching region as the free surface approaches its breakup. When Mara

SUBMITTER: Ponce-Torres A 

PROVIDER: S-EPMC7528013 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature