A computational study of oblique binary viscoelastic droplet collisions is performed. The free surface is modeled by a Lagrangian moving-mesh interface tracking method which is validated against analytical solutions and experimental data for binary Newtonian droplet collisions. Interpolation error due to cell deformation is minimized with a local topological mesh adaptation algorithm. This meth...

Coalescence of sessile polymeric fluid drops on a partially wettable substrate exhibits transition from inertial to viscoelastic regime at concentration ratio $c/c^* \sim 1$. Our findings unveil that the temporal evolution growing bridge height follows power-law behaviour $t^b$, such coefficient $b$ continuously decreases 2/3 in ($c/c^*<1$) an asymptotic value 1/2 visco-elastic ($c/c^*>1$). To ...

This paper is concerned with the numerical solution of polymer melt flows of both extrudate-swell and tube-tooling die-extrusion coatings, using a hybrid finite element/finite volume discretisation fe/fv. Extrudate-swell presents a single dynamic freesurface, whilst the complex polymer melt coating flow exhibit two separate free-surface draw-down sections to model, an inner and outer conduit su...

Viscoelastic constitutive equations are evaluated using the benchmark problem of the planar flow past a confined cylinder for a well-characterized solution of S%(w/w) polyisobutylene in tetradecane. The ratio of channel height to cylinder diameter is equal to two. We compare finite element simulations with point-wise measured velocities and stresses obtained by means of laser Doppler anemometry...

In this paper, we investigated the dynamics of a bubble rising inside ratchet channels filled with viscoelastic liquids by means volume-of-fluid-based direct numerical simulations. The exponential Phan–Thien–Tanner constitutive model was used to describe rheological behaviors nonlinear fluid. effects fluid elasticity [characterized relaxation time (λ)] and angle (θ) are mainly discussed in resp...