Axial and radial profiles of average bubble velocity, mean diameters and volumetric flow rate are presented.
For the sparse tube banks at the lower excess gas velocity, the mean bubble rise velocity, the bubble volume fraction and the visible bubble flow rate increased as the pressure was increased.
The theory developed enables prediction of the Sherwood number (Nsh, the dimensionless mass transfer coefficient) for a large particle, diameter d: Nsh=2εmf+4g3(Uε+)/π DA12 where Umf is the minimum fluidising velocity, εmf is the bed voidage at Umf-0ub is the mean bubble rise velocity and DA is the gas diffusivity.
Statistical bubble parameters (bubble frequency, mean bubble rise velocity, mean pierced bubble length and mean bubble volume fraction) were evaluated.
However, successfully detected bubbles were deemed representative of the mean bubble rise velocity as indicated by the dynamic gas disengagement technique.
Capacitance probe analysis was used to determine the mean bubble rise velocity, the mean bubble frequency, the mean pierced bubble length, the mean bubble volume fraction and the mean visible bubble flow rate.
The mean bubble rise velocity, the bubble frequency, the mean pierced length, the bubble volume fraction, and the visible bubble flow rate were measured using capacitance probes.
The mean bubble frequency, the mean bubble rise velocity, the mean bubble volume fraction and the visible bubble flow rate were found to increase with both increasing pressure and excess gas velocity.
Dynamic gas disengagement technique is utilized to measure bubble rise velocity and sauter mean bubble diameter.
