We report experiments on the overall phase diagram of granular flows on an incline with emphasis on high inclination angles where the mean layer velocity approaches the terminal velocity of a single particle free falling in air. The granular flow was characterized by measurements of the surface velocity, the average layer height, and the mean density of the layer as functions of the hopper open...

A leaky dielectric Newtonian drop suspended in another leaky dielectric Newtonian liquid medium deforms as it settles under the influence of a uniform alternating electric field. As a result of this deformation, the terminal velocity is affected. In this study we present a detailed experimental investigation of the effect of horizontally directed uniform alternating electric field on the settli...

Thin, viscous fluid threads falling onto a moving belt behave in a way reminiscent of a sewing machine, generating a rich variety of periodic stitchlike patterns including meanders, W patterns, alternating loops, and translated coiling. These patterns form to accommodate the difference between the belt speed and the terminal velocity at which the falling thread strikes the belt. Using direct nu...

The settling dynamics of falling spheres inside a Laponite suspension is studied. colloidal synthetic clay that shows physical aging in aqueous due to the spontaneous evolution inter-particle electrostatic interactions. In our experiments, millimeter-sized steel balls are dropped suspensions different ages (i.e., time elapsed since sample preparation). motion captured using high-speed camera an...

Gait dysfunction and falling are major sources of disability for patients with advanced Parkinson's disease (PD). It is presently thought that the fundamental defect is an inability to generate normal stride length. Our data suggest, however, that the basic problem in PD gait is an impaired ability to match step frequency to walking velocity. In this study, foot movements of PD and normal subje...

Molecular dynamics studies of nanometer-sized rigid grains, droplets and bubbles in nanometer-sized pores indicate that the drag force may have a hydrodynamic form if the moving object is dense and small compared to the pore diameter. Otherwise, the behavior is nonhydrodynamic. The terminal speed is insensitive to whether the falling droplet is made of liquid or a solid. The velocity profiles w...