Selection of Hole Size for Fluidization Pipes

by Corinne Ledwith, Engineer; U.S. Army Corps of, Engineers, Philadelphia, United States,
Richard N. Weisman, Engineer; U.S. Army Corps of, Engineers, Philadelphia, United States,
Gerard P. Lennon, Engineer; U.S. Army Corps of, Engineers, Philadelphia, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: Two-dimensional fluidization experiments are performed on fine and medium coarse quartz sands at depths of 25.4 and 42 cm. Four supply pipes are used with orifice diameters of 1.587 mm (1/16 inches), 3.175 mm (1/8 inches), 4.76 mm (3/16 inches), and 6.35 mm (1/4 inches) spaced 5.08 cm (2 inches) on centers. Hydraulic head in the bed, pressure in the supply pipe, flow rate, and geometry of the fluidized region are measured for pre-fluidization, initial and complete fluidization, and for slurry removal. The effect of hole size for each of these phases is discussed, leading to the recommendation that orifice sizes 3.175 mm to 4.76 mm should be used for most applications.

Subject Headings: Pressure pipes | Pipe sizes | Fluidization | Pressure measurement | Sandy soils | Flow measurement | Fluid flow | Soil pressure

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