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Computed particle hold-up in a vertical pneumatic conveying line

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Theoretical formulas developed from drift-flux model were used to predict the solid hold-up of gas-solid transportation in a vertical pneumatic conveying line. These formulas depend on their physical properties: density, viscosity and diameter of particles, and the flow rates of the two phases. For low solid flux, the calculations from this drift-flux model agree very well with experimental results. At high solid flow or low gas flow rate, the solid distribution in the conveying line is not uniform. We obtain a larger discrepancy between the theoretical computation and experimental results. Using hydrodynamic equations including two continuity equations and two momentum equations to predict the solid hold-up produces better results.

Affiliations: 1: Department of Applied Chemistry, Chung Cheng Institute of Technology, Taoyuan, Taiwan, ROC; 2: Department of Chemical Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA


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