文献类型：期刊文献

英文题名：Determination of Liquid Multiscale Circulation Structure in a Bubble Column by Tracing the Liquid Flowing Trajectory

作者：Huang, Zi-Bin[1];Cheng, Zhen-Min[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：50

期号：21

起止页码：11843

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20114414477235);WOS:【SCI-EXPANDED(收录号:WOS:000296128300009)】；

基金：This work was carried out under support from Natural Science Foundation of China through Grant No.20876043 and No. 21076072.

语种：英文

外文关键词：Flow structure - Frequency domain analysis - Bubble columns - Hydraulic turbines

摘要：To identify the liquid circulation flow structure in a bubble column, a set of multipoint tracer injection and detection device was developed for a systematic study in a bubble column of 550 cm in height and SO cm in diameter. Tracer response profiles were measured to track the liquid flowing trajectory under various flow conditions in the column with and without draft tubes. They showed that only when the draft tube length was greater than 3 m could the tracer response exhibit obvious periodicity. To resolve the liquid circulation flow structure in the time and frequency domain, wavelet rnultiresolution analysis was adopted. The results showed that the liquid circulation frequency increased with superficial gas velocity, which is in agreement with the published literature. It was also found that the macroscale, mesoscale, and microscale circulation loops coexisted in the bubble column.