Two Fluid Drop Snap-Off Problem: Experiments and Theory

We address the dynamics of a drop with viscosity lambda eta breaking up inside another fluid of viscosity eta. We track the time evolution of the drop near snap-off in the experiments and then compare with a scaling theory developed for lambda = 1. The theory is in excellent agreement with both the experiments and the previous simulations of Lister and Stone. Finally, we also investigate the lambda dependence of the drop shape and breaking rate, and develop a simple theory for the latter.