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

作者：Wang Xing jun^*; Hu Li shun; Shen Jun jie; Yu Zhi nan; Wang Fu chen; Yu Zun hong

来源：Journal of Central South University of Technology, 2007, 14(5): 696-700.

DOI：10.1007/s11771-007-0133-x

• pressure fluctuation
• R/S analysis
• multi-scale
• multi-fractal
• bubble column bed reactor

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.

• 出版日期2007-10
• 单位华东理工大学