Universality in coalescence of polymeric fluids

Abstract

A pendant drop merging with a sessile drop and subsequently forming a single daughter drop, is known to exhibit complex topologies, but their dynamics are yet to be probed for...

Coalescence of polymeric sessile drops on a partially wettable substrate

“…Velocity profile of the flow along x-direction is determined by using the linear PTT constitutive relation as given in Eq. (7) where, s is the extra stress tensor, j is a model parameter and D is the deformation rate tensor,…”

“…The neck radius evolution has the scale of r $ t in the viscous regime and r $ t 1=2 in the inertial regime. However, a recent study on polymeric droplets coalescence 7 proposed a scaling of r $ t 0:36 , emphasizing the effect of elasticity on coalescence. The universal behavior in both the Newtonian 8 and polymeric droplets 7 is presented in the literature.…”

“…29 In fact, the presence of elasticity and characteristic timescale in the fluid has shown significant deviation in coalescence dynamics signature as compared to Newtonian fluids. 7 Despite some work in this area, coalescence behavior of viscoelastic droplets still remains a sparsely studied area.…”

When elasticity affects drop coalescence

“…In contrast to breakup (see [17,18] and references therein), few studies exist on the coalescence dynamics of viscoelastic drops [19] [Fig. 1(bc)].…”

Wetting and coalescence: beyond single-phase flows

“…[36,193] and references therein), few studies exist on the coalescence dynamics of viscoelastic drops (see Fig. 7.1bc) [194]. Previous works exploring the effects of viscoelasticity on drop coalescence have focussed on film drainage as the two drops come together before coalescence [195,196].…”