Abstract
An experiment is presented here that shows a discontinuous change of flow pattern like hydraulic jumps in gravity flow of granular materials. In the upstream of jump the flow pattern is heterogeneous suspension flow where the particles mainly travel near the pipe bottom and suddenly changes to suspension flow accompanied with the particle settled layer of definite height where the particle velocity is decreased. The position of jump can be adjusted by changing the gas velocity. The experiment is carried out in a horizontal straight pipe of 30 mm in diameter and 5 m in length. Polystyrene beads are used, the diameter and the material density being 1.65 mm and 1034 kg/m 3 , respectively. This chapter experimentally examines the flow when the rear side of the settled layer is ceased, while the particle conveying is steadily maintained. In the upstream the flow pattern is heterogeneous suspension flow where the particles mainly travel near the pipe bottom, and it suddenly changes to suspension flow over the particle settled layer of definite height. Here, this change of flow pattern is called as a granular jump. This kind of discontinuous change of flow pattern likes hydraulic jumps in gravity flow of granular materials, where the particle flow is driven by gravity.
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