Pulsed piston transport

Konrad was the first to address the issue of pulsed piston transport using the properties of the solids as they slide through the pipe in a plug-like motion. The friction generated in such systems often can be likened to bin and hopper flow and design, requiring shear stress measurements such as carried out by the Jenike shear stress unit. The final expression using the Konrad approach can be written for horizontal flow as... 

Figure 16.14. Three types of crystal purifiers with different ways of transporting the crystals, (a) Spiral or screw conveyor type, laboratory scale, but successful up to 200 mm dia [Schildknecht, Z. Anal. Chem. 181, 254 (1961)). (b) Philips purifier with reciprocating piston or pulse pump drive [McKay, Dale, and Weedman, Ind. Eng. Chem. 52, 197(I960)], (c) Combined crystallizer and purifier, gravity flow of the crystals purifier details on the right (Brodie, 1971).

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