Experimental and numerical studies are carried out to investigate thecharacteristics of flow field and forces acting on spherical particles indeep sea hydraulic collecting. For numerical simulation, DetachedEddy Simulation (DES) method is applied and is verified to be feasiblefor predicting the forces acting on the spherical particles. The effects ofcertain collecting parameters on vertical and radial force coefficients ofthe particles are investigated, including the angle between the collectingpipe inlet and the particle (θ), relative particle interval (l/d) and particlehorizontal distribution density (nA/S). It is found that C_v begins fastfading near the point where θ=20°, and Cr always reaches its maximumsomewhere between θ=35° and θ=40°. A small relative particle intervalmay result in a low pressure in the gap between the particles, leading toan increase in the radial force on the particles. This study is expected tobe useful for understanding the mechanism of hydraulic collecting andrefinements of collecting process.
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