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Study on Fractal Scale Characterization of Inclined and Vertical Upward Gas/Liquid Two Phase Flow Patterns

Author: ChiHeng
Tutor: JinNingDe
School: Tianjin University
Course: Detection Technology and Automation
Keywords: Gas-liquid two-phase flow Fractal scaling Algorithm Evaluation Dynamics of Flow pattern characterization
CLC: O359.1
Type: Master's thesis
Year: 2007
Downloads: 123
Quote: 1
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Abstract


Two-phase flow pattern identification is an important measure in question . This fractal scaling method using dynamic experiments two-phase flow conductance measurement signal processing , the results showed that the amount of different flow characteristics of a significant difference , to reflect the flow characteristics of two-phase law , the corresponding characteristic amount can be used as two phase flow pattern identification valid indicator. Firstly, in order to Weierestrass function , fgn nonlinear function generator functions and fbm fractal time series , for example, discusses the six kinds of fractal scaling algorithm works in the common Gaussian noise, random noise, periodic noise and impulse noise applicability. Found that the elimination of the fractal scaling law of detrended fluctuation robustness . On this basis , this paper presents a vertical upward sloping upward pipe and gas-water two-phase flow conductance fluctuation signals fractal scale characterization results. Found in the vertical riser pipe , the water phase superficial velocity 0.0453ms -1 ~ 0.226ms -1 , gas superficial velocity 0.0043ms -1 ~ 3.43ms -1 range, with the superficial gas velocity increases, bubbly flow fractal scale minimum and exhibited random complex dynamic behavior ; slug fractal scaling the highest and performance outlet plug and slug periodic alternating motion behavior ; churn flow fractal scaling in between and with the superficial gas velocity increases the performance of relatively complex motor behavior . For the ramp up phase flow, bubble flow fractal scaling is extremely high, and with little change in superficial gas velocity increases , the performance of relatively simple dynamical behavior . Slug fractal scaling with increasing superficial gas velocity showed decreasing trend , the performance of the gas plug and slug weakened intermittent motion behavior . The results show that : Based on the fractal conductance signals scale better reflect changes in flow patterns , the understanding of dynamical evolution of the gas-liquid two-phase flow characteristics are important reference value.

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CLC: > Mathematical sciences and chemical > Mechanics > Fluid Mechanics > Multiphase flow > Liquid, gas (vapor) two-phase flow
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