Three different orifice type air spargers of diameters 700, 1000 and 1300 [micro]m were used.
The effect of sparger diameter was studied with all the test fluids using spargers of diameters 700, 1000 and 1300 [micro]m keeping the liquid height same.
G], for all the four test fluids and spargers of 700 and 1000 [micro]m diameter for test particles mounted at the same location inside the column.
Figure 9 shows the plots of mass transfer coefficients versus UG for the spargers of 700 and 1000 [micro]m diameters.
Paras, "Effect of Liquid Properties on the Performance of Bubble Column Reactors with Fine Pore Spargers," Chem.
The air flow, after metering through a calibrated rotameter was allowed to bubble into the liquid through the sparger fitted at the bottom of the column.
Effects of test particle position, sparger diameter, and liquid height in column were studied in separate runs by making similar measurements by changing the operating condition in the column appropriately.
Depending upon the superficial gas velocity, fluid viscosity, column diameter and sparger type, different regimes of gas-liquid flows persist in bubble columns.
The sparger openings also do not appear to have much influence on the bubble rise velocity.
eff], on gas holdup, measurements were made with all the four test fluids using the same sparger and same liquid height in the column.
In order to examine the effect of position of the mass transfer surface from the sparger tip on the mass transfer coefficient, three separate test particles were mounted at fixed axial locations measured from the tip of the air sparger.
The gas holdup increases with superficial gas velocity for all sparger diameters used.