Determination of Transition Velocity

While the efforts to develop a mechanistic model for predicting Uc are limited, empirical correlations are commonly employed. For Group A and B particles within the range of 293 T 773 K and 0.1 p 0.8 MPa, the correlation of Cai et al. (1989) can be used  

Equation (9.51) is applicable for 57 mm D 475 mm. For beds with internals, values for KDf are given in Table 9.2, which shows that KDf is highly dependent on internals geometry. 

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