Fig. 1: Experimental setup showing the conveyor-driven flow and the position of the x-ray imaging setup.
From: Experimental confirmation of secondary flows within granular media
Here, h is the flow thickness, L the heap length, and h* its height. The wall at the exit of the reservoir and the outgoing wall are elevated at heights h1 and h2, respectively, which control the steadiness of the heap. The conveyor belt moves at a velocity Ub in a counter-clockwise direction, as indicated by the circular arrows at the edges of the belt. The conveyor belt transports the particles in the direction indicated by the dashed arrows. a and b show example radiographs captured during the steady state for detectors 1 and 2, respectively. The origin of the global coordinate system (x, y, z) is at the centre of the line connecting the wall and the conveyor belt. Coordinate systems (η, ζ) are local to each x-ray detector. The experimental geometry and radiographs are illustrated using Supplementary Video 1 (available online).
