Abstract
The one-dimensional model of accelerating turbulent gas-solids dilute phase flow of coarse particles is formulated and experimentally verified by measuring the pressure distribution along the transport tube. The theoretical basis of the model is the continuity and momentum equations for the fluid and particle phases of Nakamura and Capes (Can. J. Chem. Eng., 51 (1973) 39) and the authors' variational model for calculating fluid-particle interphase drag coefficient (Grbavcic et al., Powder Technol., 68 (1991) 199). The main model assumptions are that the constituted relations for fluid-particle interphase drag coefficient, fluid-wall friction coefficient and particle-wall friction coefficient remain the same regardless of the acceleration of the fluid and particle phases. In addition, the transport line inlet voidage required for closure has been derived for the cases where top-closed spouted or spout-fluid beds were used as a feeding device to the transport tube. Experiments were performed by transporting spherical glass particles 1.94 mm in diameter in a 30 mm i.d. glass tube. Reynolds number for the particles, based on slip velocity, ranged from 1524 to 2562 and loading ratio was varied between 4.8 and 26.4. Model predictions for the pressure distribution along the transport tube are in good agreement with experimental measurements.
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