EFFECTS OF LIQUID VISCOSITY ON RADIAL GAS HOLDUP PROFILES WITHIN ANNULAR SECTION IN DOUBLE-TUBE BUBBLE-COLUMN

The local gas holdup of carboxymethyl cellulose (CMC) solution-air sys tem in the annular section of a double-tube bubble column is measured by a probe technique. The local gas holdup decreases with increasing C MC concentration. The empirical equation developed for a water-air sys tem to estimate the maximum gas holdup in the annular section is modif ied by the relative viscosity of the solution to water. Compared with the experimental results, it is demonstrated that the modified correla tion is appliable to a CMC solution-air system.