The mixing of immiscible oil and water by a pitched blade turbine in cylindrical vessel is studied numerically. Three-dimensional simulations combined with hybrid front-tracking/level-set method are employed to capture the complex flow interfacial dynamics. A large eddy simulation approach, Lilly–Smagorinsky model, simulate turbulent two-phase dynamics at Reynolds numbers $Re=1802{-}18\ 026$ . ...

The process of coalescence of two identical liquid drops is simulated numerically in the framework of two essentially different mathematical models, and the results are compared with experimental data on the very early stages of the coalescence process reported recently. The first model tested is the 'conventional' one, where it is assumed that coalescence as the formation of a single body of f...

Drop coalescence occurs through the rapid growth of a liquid bridge that connects two drops. At early times after contact, dynamics is typically self-similar, with details depending on geometry and viscosity liquid. In this paper we analyse two-dimensional viscous drops float quiescent deep pool; such are called lenses. The analysis based thin-sheet equations, which were recently shown to accur...

Contents Introduction: Drop coalescence and applications; Effect of inter-phase mass transfer. • Inter-phase transport of solutes-convection-diffusion equations in the phases. Numerical method: • Boundary Integral Method for the Stokes equations in the drops; • Finite Difference Method for the flow in the film and the convection-diffusion equations.

Three-dimensional multiphase flow and flow with phase change are simulated using a simplified method of tracking and reconstructing the phase interface. The new level contour reconstruction technique presented here enables front tracking methods to naturally, automatically, and robustly model the merging and breakup of interfaces in three-dimensional flows. The method is designed so that the ph...

When a drop of a viscous fluid is deposited on a bath of the same fluid, it is shown that its coalescence with this substrate is inhibited if the system oscillates vertically. Small drops lift off when the peak acceleration of the surface is larger than g. This leads to a steady regime where a drop can be kept bouncing for any length of time. It is possible to inject more fluid into the drop to...

In conventional dropwise condensation on a hydrophobic surface, the condensate drops must be removed by external forces for continuous operation. This Letter reports continuous dropwise condensation spontaneously occurring on a superhydrophobic surface without any external forces. The spontaneous drop removal results from the surface energy released upon drop coalescence, which leads to a surpr...