An Experimental Study of Swirling Flow Pneumatic Conveying System in a Vertical Pipeline

[+] Author and Article Information
Hui Li

Department of Mechanical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima, Japan

Yuji Tomita

Department of Mechanical Engineering, Kyushu Institute of Technology, 1-1 Sensuicho, Tobata, Kitakyushu, Japan

J. Fluids Eng 120(1), 200-203 (Mar 01, 1998) (4 pages) doi:10.1115/1.2819649 History: Received October 30, 1996; Revised October 15, 1997; Online December 04, 2007


A swirling flow is adopted for a vertical pneumatic conveying system to reduce conveying velocity, pipe wear, and particle degradation. An experimental study has addressed the characteristics of swirling flow pneumatic conveying (SFPC) for the total pressure drop, solid flow patterns, power consumption, and additional pressure drop. Polystyrene, polyethylene, and polyvinyl particles with mean diameters of 1.7, 3.1, and 4.3 mm, respectively, were transported as test particles in a vertical pipeline 12.2 m in height with an inside diameter of 80 mm. The initial swirl number was varied from 0.38 to 0.94, the mean air velocity was varied from 9 to 23 m/s, and the mass flow rate of the solids was varied from 0.3 to 1.25 kg/s. The minimum and critical air velocities decreased as much as 20 and 13 percent, respectively, when using SFPC. The total pressure drop and power consumption of SFPC are close to those of axial flow pneumatic conveying in the low air velocity range.

Copyright © 1998 by The American Society of Mechanical Engineers
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