Pipe rotating, vertical

The leaching plant, shown in Figure 10.6, consists of an open tank, 3 m in diameter, into the outer portion of which the solid is continuously introduced from an annular hopper. Inside the tank a 1.8 m diameter vertical pipe rotates very slowly at the rate of... 

Osborne [25] described a sampler that consists of a narrow slot continuously rotated on an axis parallel to the slun7 flow (Figure 1.35a). Cross [26] used a slotted pipe mounted vertically in the overflow compartment next to the vortex finder of a hydrocyclone (Figure 1.35c). 

Condensation of steam on the outside of a vertical pipe rotating around its own axis was experimentally studied by Nicol and Gacesa [131]. At high rotational speeds, where gravity can be neglected, they found that... 

To keep the pipe walls vertical at the cut positions, a bending moment mo must be applied. Its value, obtained by analysing how the stored elastic energy in the pipe wall varies with rotation of the cut points, is... 

The twisting rubber hoses or o ringed elbows which connect the rotating pan necks with pipe and the wear plate to the face of the stationary valve The condition of the high impact nozzles mounted on the cloth wash manifold and, for wet cake discharge, the sluicing manifold The support rollers which take the vertical load of the entire machine and the horizontal thrust rolls that maintain the rotating frame concentric The toothed rim and sprocket which drives the pan filter... 

Solid particles hydraulically conveyed in a vertical pipe are subjected to various forces which cause them to rotate and move inwards towards the axis of the pipe. The effect is most pronounced with large velocity gradients. 

The effect of turbulence in the fluid stream has been studied by Richardson and Meikle(25) who suspended a particle on a thread at the centre of a vertical pipe up which water was passed under conditions of turbulent flow. The upper end of the thread was attached to a lever fixed on a coil free to rotate in the field of an electromagnet. By passing a current through the coil it was possible to bring the level back to a null position. After calibration, the current required could be related to the force acting on the sphere. 

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