Mass transfer in countercurrent and cocurrent bubble columns

Abstract

The hydrodynamic and mass transfer characteristics in countercurrent, cocurrent and liquid batch operations with various Newtonian liquids were studied experimentally using the same bubble column. Taking the effects of gas sparger geometries, operating variables and liquid properties into account, empirical correlations were obtained for the gas hold-up and the volumetric liquidphase mass transfer coefficient.

The effect of gas‐liquid counter‐current operation on gas hold‐up in bubble columns using electrical resistance tomography

“…But there is a small error in the heterogeneous regime, namely the overall hold-up slightly increases with increasing liquid velocities, which is similar to information reported in references. 3,4 The reason could be that the rise in velocity of the gas bubble decreases with increasing liquid velocities in a counter-current operation and results in increasing the residence time of a gas bubble in the column, and in the overall hold-up. This means that the retarding effects on the rising bubbles arising www.soci.org H Jin et al from the counter-current flow of the liquid makes the operation of the column more effective.…”

“…Based on the experimental results, a correlation is developed for the centreline hold-up with respect to gas velocity (u g ), liquid velocity (u l ) and height to diameter ratio (H/D) as shown in Equation (4). Figure 6 shows a comparison of calculated and experimental ε g, centre values.…”

“…Otake et al 3 studied the behaviour of gas hold-up and flow regimes. Seno et al 4 studied the hydrodynamics and mass transfer characteristics in counter-current, co-current and liquid batch operations, and gave two empirical correlations for the gas hold-up and the volumetric liquid phase mass transfer coefficient. Hidaka et al 5 investigated the axial mixing of liquid in a bubble column with a counter-current flow.…”

Development of Unified Correlations for Volumetric Mass-Transfer Coefficient and Effective Interfacial Area in Bubble Column Reactors for Various Gas−Liquid Systems Using Support Vector Regression

“…The wide size distribution of bubbles is known to create difficulties in the measurement of a, particularly by chemical methods. 67,68 (8) The presence of adventious impurities and surface-active agents affects fractional gas holdup ( G ) and, hence, k L a and a. Table 3.…”

Enzyme deactivation in a bubble column, a stirred vessel and an inclined plane

“…The energy was supplied to the bubble column by the introduction of gas. The gassed power consumption per unit mass is V G × g. The mass transfer coe cient for the bubble column was estimated using the following correlation (Seno, Uchida, & Tsuyutani, 1990): (1)…”