Abstract
A number of empirical equations are available for predicting choking gas velocity in vertical pneumatic conveying. Five such equations are evaluated against published results of different types of gas—solid system using Geldart's classification. It is found that no equation is suitable for all types of system. The equation of Yousfi and Gau is found to correlate all Geldart Group A and Group B choking results to within a root-mean-square relative deviation (RMSRD) of 10%. The equation is recommended for use for Group A and Group B systems. Yang's latest equations correlate Group D results with a RMSRD of 16% and are recommended for use for Group D systems. The equations of Leung et al. give reasonable agreement with Group D results (RMSRD = 20%) and their equations can handle mixed-size particles. Further work is required to develop a more fundamental basis for choking velocity equations and to provide more experimental results for mixed-size particles in tubes of large diameter.
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