We experimentally investigated how a binary granular mixture made up of spherical glass beads (size ratio 2) behaved when flowing down chute. Initially, the was normally graded, with all small particles on top coarse grains. Segregation led to grading inversion, in which smallest percolated bottom flow, while largest rose toward top. Because diffusive remixing, there no sharp separation between small-particle and large-particle layers, but continuous transition. Processing images taken at...

We experimentally study particle scale dynamics during segregation of a bidisperse mixture under oscillatory shear. Large and small particles show an underlying asymmetry that is dependent on the local concentration, with segregating faster in regions many large slower particles. quantify bulk scales, capture it theoretically. This gives new physical insight into reveals similarity sedimentation, traffic flow, diffusion.

Experiments were undertaken to investigate dam-break flows where a finite volume of highly viscous fluid (glucose with viscosity μ ≈ 350 Pa s) maintained behind lock gate was released into horizontal or inclined flume. The resulting sequence flow-depth profiles tracked using three-dimensional visualization system. In the low-Reynolds-number and high-capillary-number limits, analytical solutions can be obtained from Navier–Stokes equations lubrication theory matched asymptotic expansions. At...

We experimentally investigated the spreading of fluid avalanches (i.e., fixed volumes fluid) down an inclined flume. Emphasis was given to velocity field within head. Using specific imaging techniques, we were able measure profiles flowing far from sidewalls. studied behavior Newtonian and viscoplastic fluids for various flume inclinations initial masses. For tested (glycerol Triton X100), compared measured with that predicted by lubrication theory. Provided flow Reynolds number Re...

Abstract This paper addresses the dam-break problem for particle suspensions, that is, flow of a finite volume suspension released suddenly down an inclined flume. We were concerned with concentrated suspensions made up neutrally buoyant non-colloidal particles within Newtonian fluid. Experiments conducted over wide ranges slope, concentration and mass. The major contributions our experimental study are simultaneous measurement local properties far from sidewalls (velocity profile and, lower...

We experimentally studied the flow behavior of a fixed volume granular suspension, initially contained in reservoir and released down an inclined flume. Here “granular suspension” refers to suspension non-Brownian particles viscous fluid. Depending on solids fraction, density mismatch, particle size distribution, wealth behaviors can be observed. we report interpret results obtained with suspensions, which consisted neutrally buoyant fraction (ϕ = 0.575–0.595) close maximum random packing...

Gravity-driven flows can erode the bed along which they descend and increase their mass by a factor of 10 or more. This process is called “basal entrainment.” Although documented field observations laboratory experiments, it remains poorly understood. paper examines what happens when viscous gravity-driven flow generated releasing fixed volume incompressible Newtonian fluid encounters stationary layer (composed with same density viscosity). Models based on depth-averaged momentum balance...

We present flume experiments showing plastic behavior for perfectly density-matched suspensions of non-Brownian particles within a Newtonian fluid. In contrast with most earlier experimental investigations (carried out using coaxial cylinder rheometers), we obtained our rheological information by studying thin films suspension flowing down an inclined flume. Using the same refractive index as interstitial fluid made it possible to measure velocity field far from wall laser-optical system. At...

An optical visualization apparatus has been designed to measure the particle‐velocity and solid‐concentration profiles of highly concentrated coarse‐particle suspensions in a wide‐gap Couette rheometer. The main objective is investigate frictional‐viscous transition, phenomenon that already reported recent papers [1, 2, 3, 4], but still remains partially understood. For viscometers complex fluids, related issue problem, which underpins rheometrical treatment for viscometric flows...

An optical visualization apparatus has been designed to measure the particle‐velocity and solid‐concentration profiles of highly concentrated coarse‐particle suspensions in a wide‐gap Couette rheometer. The main objective is investigate frictional‐viscous transition, phenomenon that already reported recent papers [1–4], but still remains partially understood. For viscometers complex fluids, related issue problem, which underpins rheometrical treatment for viscometric flows coaxial‐cylinder...

We experimentally study particle scale dynamics during segregation of a bidisperse mixture under oscillatory shear. Large and small particles show an underlying asymmetry that is dependent on the local concentration, with segregating faster in regions many large slower particles. quantify bulk scales, capture it theoretically. This gives new physical insight into reveals similarity sedimentation, traffic flow diffusion.

The objective of this thesis was to increase our understanding two-phase geophysical flows (e.g. debris flows) by providing velocity profiles in idealized laboratory avalanches. To that end, we developed a new experimental platform made up an inclined flume coupled imaging system measure granular suspension. 3.5 m long and 10 cm wide could be from 0 35°. A reservoir with the capacity for l fluid located upper part closed pneumatic controlled gate. Velocity were obtained using Particle Image...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation N. Andreini, S. Wiederseiner, M. Rentschler, C. Ancey; Avalanches of Concentrated Granular Suspensions Down an Inclined Plane. AIP Conf. Proc. 7 July 2008; 1027 (1): 1045–1047. https://doi.org/10.1063/1.2964462 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote...