The primary interest of Professor Stone is low-Reynolds-number flows in which the applications include the behavior and characterization of particulate and multi-phase flows, microfluidic systems (including collaboration with Professor Whitesides in the Chemistry Department), fluid motion in foams, and coating flows.  Current experiments include fluid drainage in foams, high-speed coating of fibers, and dynamics of wet granular materials.  Hydrodynamics of monolayer and bilayer films and the deformation of droplets and other fluid-fluid interfaces (drop breakup and coalescence) have been the subject of a number of analytic and numerical investigations.  Related studies of the deformation and motion of drops in rapidly rotating viscous fluids and viscous flows representative of the Earth's mantle are conducted in collaboration with geophysicists in the Dept. of Earth and Planetary Sciences.  Also, there are close research ties with the studies of sedimentation and the rheology of complex materials conducted by Professor Weitz (DEAS and Physics).