Multi-scale and multi-fractal analysis of pressure fluctuation in slurry bubble column bed reactor
来源期刊：中南大学学报(英文版)2007年第5期
论文作者：王兴军 胡立舜 沈军杰 余志楠 王辅臣 于遵宏
文章页码：696 - 696
Key words：pressure fluctuation; R/S analysis; multi-scale; multi-fractal; bubble column bed reactor
Abstract: 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.
基金信息：the Program for New Century Excellent Talents in University
