Simultaneous measurement of hold-up profiles and interfacial area using LDA in bubble columns: predictions by multiresolution analysis and comparison with experiments

Abstract

A wavelet-based technique was used for the identification of bubble events from the velocity-time data obtained using LDA in bubble column reactors. Bubble rise velocity distribution was also measured from the velocity-time series, which enabled the estimation of bubble size and shape distributions. From this information, the values of local fractional gas hold-up (ε_G) and effective interfacial area a̅ were calculated. The estimated values of a̅ have been compared with those obtained from the chemical method of air-oxidation of sodium sulfite. For this purpose, LDA measurements were carried out during the reaction of sulfite oxidation.