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When an aqueous drop contacts an immiscible oil film, it displays complexinterfacial dynamics. Upon contact the oil spreads onto the drop's liquid-airinterface, first forming a curvature that drives an apparent drop spreadingmotion and later fully engulfing the drop. We study this flow using both3-phase Lattice-Boltzmann simulations based on the conservative phase fieldmodel and experiments. Inertially and viscously limited dynamics are exploredusing the Ohnesorge number $Oh$ as a function of $R/H$, the ratio between theinitial drop radius $R$ and the film height $H$. Both regimes show that theapparent spreading radius $r$ is fairly independent of the film height, andscales with time $T$ as $r\sim T^{1/2}$ for $Oh\ll 1$ and for $Oh\gg 1$ as$r\sim T^{2/5}$. For $Oh\gg 1$ we show experimentally that this immiscibleapparent spreading motion is analogous with the miscible drop-film coalescencecase. Contrary to the apparent spreading, however, we find that the late timeengulfment dynamics and final interface profiles are significantly affected bythe ratio of $H/R$.

Engulfment of a drop on solids coated by thin and thick fluid films