A simplified model of gas-solid riser hydrodynamics
- Cornell Univ., Ithaca, NY (USA). Dept. of Mechanical and Aerospace Engineering
- Cornell Univ., Ithaca, NY (USA). Dept. of Theoretical and Applied Mechanics
This paper describes a model of gas-solid flow in the riser section of a circulating fluidized bed has been developed. The particulate phase is treated as a continuum granular material and the conservation equations of Jenkins have been modified to incorporate the drag force from the gas. In this model, it is assumed that particle fluctuations are primarily affected by inter-particle collisions rather than gas turbulence. In addition, steady, fully developed conditions are assumed. Granular material theory provides expression for the particle shear stress and the correct boundary conditions for particle velocity at the wall. In particular, the solid volume fraction is related to the root mean square fluctuating velocity. The gas phase is treated using correlations for turbulent pipe flows but its time-averaged velocity is affected by particle drag. A simple analytical solution of the linearized equations in the wall region and numerical solutions for the entire riser section are presented.
- OSTI ID:
- 5476919
- Report Number(s):
- CONF-881143--
- Country of Publication:
- United States
- Language:
- English
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