LIQUID CIRCULATION, GAS HOLDUP AND PRESSURE DROP IN BUBBLE COLUMN WITH DRAUGHT TUBE

抄録

The effects of gas velocity and geometrical dimensions of apparatus on the flow rate Q_L of circulating liquid, gas holdups and pressure drops in bubble columns with draught tube were examined. It was found that Q_L increases with increasing gas velocity, column diameter, draught tube length, and height of the lower end of draught tube, and decreases with increasing liquid viscosity. It was also found that the maximum value of Q_L is observed for constant values of gas velocity and column diameter, when the diameter ratio of draught tube and column is about 0.6.
Empirical equations for gas holdups in draught tube and annulus and the pressure drops due to flow reversals, necessary for estimating Q_L, are proposed.