We have studied the gravity driven flow of spherical shaped, millimetric sized granular material coated with aspherical, micron-sized, near frictionless lubricant particles. Experiments were performed on an inclined plane using two different particles for varying concentrations lubricant. The particle volumetric rate exhibits a non-monotonic behavior increasing concentration. It shows increase ...

Abstract The friction force on a circular object rolling without sliding down an inclined plane is due to static friction. If the commences in mode at top of incline, and if incline angle small, then small additional arises reduce speed contact point zero sufficiently long. While sliding, total equal plus force. effect described theoretically supported by measurements linear angular velocities ...

The title compound, C20H15N3OS, is V-shaped. In the 4-phen-oxy-phenyl group, the two rings are inclined to one another by 74.52 (13)°. These rings are inclined to the triazole ring by 72.20 (15) and 72.30 (15)°, respectively. The phenyl ring is inclined to the triazole ring by 10.85 (12)°. In the crystal, mol-ecules are linked via N-H⋯N hydrogen bonds, forming chains propagating along [010]. Th...

A method is developed for simulating the film flow of a suspension of rigid particles with arbitrary shapes down an inclined plane in the limit of vanishing Reynolds number. The problem is formulated in terms of a system of integral equations of the first and second kind for the free-surface velocity and the traction distribution along the particle surfaces involving the a priori unknown partic...

C. G. Johnson, J. M. N. T. Gray (2010), J. Fluid Mech., (Submitted) • “Weak, strong and detached oblique shocks in gravity driven granular free-surface žows”, J. M. N. T. Gray, X. Cui (2007), J. Fluid Mech., 579, 113–136 • “Dežecting dams and the formation of oblique shocks in snow avalanches at Flateyri, Iceland”, X. Cui, J. M. N. T. Gray, T. Johannesson (2007), J. Geophys. Res., 112, F04012 •...

We consider the release from a point source of relatively heavy fluid into a porous saturated medium above an impermeable slope. We consider the case where the volume of the resulting gravity current increases with time like t and show that for α < 3, at short times the current spreads axisymmetrically, with radius r ∼ t, while at long times it spreads predominantly downslope. In particular, fo...