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Inhomogeneities in Fluidization of Spherical Particle Beds with Non-Newtonian Polymer Solutions

I. Machač, B. Šiška, and Z. Lecjaks

Department of Chemical Engineering, Faculty of Chemical Technology, University of Pardubice, CZ-532 10 Pardubice

 

Abstract: The anomalous course of expansion of spherical particle beds fluidized with non-Newtonian polymer solutions has been investigated experimentally in dependence on rheological properties of the fluid. In the experiments, the expansion of beds of uniform glass and lead balls was measured in two perspex rectangular columns. The test liquids were solutions of glycerol (Newtonian fluids), and aqueous solutions of Various polymers (non-Newtonian fluids). The typical courses of bed expansion of spheres of 2.7 mm and 5.0 mm in diameter in the column of width 0.8 cm were documented by video-recording.It was confirmed that due to the sheer-thinning and elasticity of the fluid, the uniform fluidization becomes an aggregative one and the bed expansion reduces. The relationship, which is based on Carreau viscosity model, was proposed far the estimation of the maximum bed voidage and the extent of bed expansion. An analysis of the bed voidage distribution for fluidization of glass spheres of 5 mm in diameter with glycerol and non-Newtonian solutions of Natrosol and Praestol was discussed as well.

Full paper in Portable Document Format: 536a390.pdf

 

Chemical Papers 53 (6) 390–395 (1999)

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