9K. P. Galvin, S. Pratten, and G. Nguyen Tran Lam. A generalized empirical description for particle slip velocities in liquid fluidized beds [ J ]. Chemical Engineering Science, 1999, 54 : 1045 1052.
10Smith, T.N. , A Model of Settling Velocity [ J ]. Chemical Engineering Science, 1998, 53(2) : 875 -884.