Investigation of the radial effect on the transition velocities in a bubble column based on the modified Shannon entropy

At r/R = 0.63 the end of the gas maldistribution regime was shifted to a somewhat higher Utrans value (0.067 m/s). The second transition sub-regime began at 0.101 m/s, whereas the onset of the churn-turbulent regime occurred at 0.124 m/s.