Using the cross-correlation function of two pressure fluctuation signals, the rise velocities of slugs and voids and the slug frequency in the slugging and turbulent fluidized beds of glass beads(d_p=0.362mm) have been determined in a 0.1m-ID×3.0m high Plexiglas column.
The slug rise velocity in the slugging flow regime increases with an increase in gas velocity, while the void velocity remains almost constant with the variation of gas velocity in the turbulent flow regime. The slug frequencies are found to be insensitive to the increase of gas velocity in the slugging flow regime within the frequency range of 0.47-0.64Hz.
The data of the present and previous studies on the slug rise velocity in the slugging flow regime have been correlated as

U_s = 1.73×10^-2( d_p/D_t)^-0.093 ( _s/ _g )^-0.616 (U_g-U_mf)+0.35(gD_t)^1/2