文献类型：期刊文献

中文题名：Multi-scale and multi-fractal analysis of pressure fluctuation in slurry bubble column bed reactor

英文题名：Multi-scale and multi-fractal analysis of pressure fluctuation in slurry bubble column bed reactor

作者：Wang Xing-jun[1];Hu Li-shun[1];Shen Jun-jie[1];Yu Zhi-nan[1];Wang Fu-chen[1];Yu Zun-hong[1]

机构：[1]E China Univ Sci & Technol, Inst Clean Coal technol, Shanghai 200237, Peoples R China

年份：2007

卷号：14

期号：5

起止页码：696

中文期刊名：Journal of Central South University of Technology

外文期刊名：JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY

收录：;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000251847000019)】；

基金：Project(NCET-05-0413)support by the Program for New Century Excellent Talents in University;Project(YB0142112) support by Priming Foundation of East China University of Science and Technology

语种：英文

中文关键词：pressure fluctuation; R/S analysis; multi-scale; multi-fractal; bubble column bed reactor

外文关键词：pressure fluctuation; R/S analysis; multi-scale; multi-fractal; bubble column bed reactor

摘要：The Daubechies second order wavelet was applied to decompose pressure fluctuation signals with the gas flux varying from 0.18 to 0.90 m3/h and the solid mass fraction from 0 to 20% and scales 1?9 detail signals and the 9th scale approximation signals. The pressure signals were studied by multi-scale and R/S analysis method. Hurst analysis method was applied to analyze multi-fractal characteristics of different scale signals. The results show that the characteristics of mono-fractal under scale 1 and scale 2, and bi-fractal under scale 3?9 are effective in deducing the hydrodynamics in slurry bubbling flow system. The measured pressure signals are decomposed to micro-scale signals, meso-scale signals and macro-scale signals. Micro-scale and macro-scale signals are of mono-fractal characteristics, and meso-scale signals are of bi-fractal characteristics. By analyzing energy distribution of different scale signals,it is shown that pressure fluctuations mainly reflects meso-scale interaction between the particles and the bubble.
The Daubechies second order wavelet was applied to decompose pressure fluctuation signals with the gas flux varying from 0.18 to 0.90 m(3)/h and the solid mass fraction from 0 to 20% and scales 1-9 detail signals and the 9th scale approximation signals. The pressure signals were studied by multi-scale and R/S analysis method. Hurst analysis method was applied to analyze multi-fractal characteristics of different scale signals. The results show that the characteristics of mono-fractal under scale I and scale 2, and bi-fractal under scale 3-9 are effective in deducing the hydrodynamics in slurry bubbling flow system. The measured pressure signals are decomposed to micro-scale signals, meso-scale signals and macro-scale signals. Micro-scale and macro-scale signals are of mono-fractal characteristics, and meso-scale signals are of bi-fractal characteristics. By analyzing energy distribution of different scale signals, it is shown that pressure fluctuations mainly reflects meso-scale interaction between the particles and the bubble.