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On the formation of bubbles in gas-particulate fluidized beds

Published online by Cambridge University Press:  19 April 2006

Jerome B. Fanucci ,
Nathan Ness  and
Ruey-Hor Yen
Jerome B. Fanucci
Affiliation:
Department of Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26506
Nathan Ness
Affiliation:
Department of Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26506
Ruey-Hor Yen
Affiliation:
Department of Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26506
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Abstract

The method of characteristics is applied to the nonlinear equations describing two-phase flow in a fluidized bed. The method shows how a small disturbance changes with time and distance and can, eventually, produce a flow discontinuity similar to a shock wave in gases. The parameters entering the analysis are the amplitude of the initial disturbance, the wavelength of the original disturbance, the particulate pressure function, the particulate size, the uniform fluidization voidage, the uniform fluidization velocity, the fluid viscosity, the particulate density, and the fluid density. A parametric study shows that the following factors delay shock formation: a decrease in particulate size, an increase in bed density, an increase in fluid viscosity, and a decrease in particulate density. Experimental data on bubble formation in gas-particulate fluidized beds show that these same factors delay bubble formation. It is concluded, therefore, that the shock front and the bubble front are one and the same thing.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 94 , Issue 2 , 25 September 1979 , pp. 353 - 367
Copyright
© 1979 Cambridge University Press

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