Wavelet Transform of Velocity-Time Data for the Analysis of Turbulent Structures in a Trayed Bubble Column

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Wavelet Transform of Velocity-Time Data for the Analysis of Turbulent Structures in a Trayed Bubble Column

WEN Jianping^a; JIA Xiaoqiang^a; ZHOU Huai^a; LIU Baotan^b; LI Rui^b

^aDepartment of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
^b Distillation Laboratory of StateKey Laboratories of Chemical Engineering, Tianjin University, Tianjin 300072, China

Received:1900-01-01 Revised:1900-01-01 Online:2004-10-28 Published:2004-10-28
Contact: WEN Jianping

通过速度-时间数据的小波变换研究筛板式鼓泡塔中的湍流结构

闻建平^a;贾晓强^a;周怀^a;刘宝谈^b;李瑞^b

^a Department of Biochemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
^b Distillation Laboratory of StateKey Laboratories of Chemical Engineering, Tianjin University, Tianjin 300072, China

通讯作者: 闻建平

Abstract

Abstract: Hydrodynamic and turbulent structures in the trayed bubble column with 1.2m inner diameter have been characterized from liquid-phase velocity-time series data obtained by the hot-film anemometer. Wavelet transform analysis was used for denoising the measured data and also for evaluating quantifiers of t
urbulence, viz., local intermittency measure, intermittency index and flatness factor. These quantifiers help in detecting the passage of bubbles and reveal the hidden structures and patterns in data. Also, the wavelet scalewise analysis of the turbulence at various locations in the column and under dif
ferent operating conditions could be used to build a direct relationship between the local gas holdup and flatness factor. The methodology is therefore suitable for online evaluation of the trayed bubble column performance and shows promise for developing strategies for improving process performance.

Key words: wavelet transform, trayed bubble column, hydrodynamics, turbulence structures, hot film anemometer

摘要： Hydrodynamic and turbulent structures in the trayed bubble column with 1.2m inner diameter have been characterized from liquid-phase velocity-time series data obtained by the hot-film anemometer. Wavelet transform analysis was used for denoising the measured data and also for evaluating quantifiers of t
urbulence, viz., local intermittency measure, intermittency index and flatness factor. These quantifiers help in detecting the passage of bubbles and reveal the hidden structures and patterns in data. Also, the wavelet scalewise analysis of the turbulence at various locations in the column and under dif
ferent operating conditions could be used to build a direct relationship between the local gas holdup and flatness factor. The methodology is therefore suitable for online evaluation of the trayed bubble column performance and shows promise for developing strategies for improving process performance.

关键词: 鼓泡塔;板式;筛板;研究;湍流结构;时间;小波变换

WEN Jianping, JIA Xiaoqiang, ZHOU Huai, LIU Baotan, LI Rui. Wavelet Transform of Velocity-Time Data for the Analysis of Turbulent Structures in a Trayed Bubble Column[J]. .

闻建平,贾晓强,周怀,刘宝谈,李瑞. 通过速度-时间数据的小波变换研究筛板式鼓泡塔中的湍流结构[J]. CIESC Journal.

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