Multi-Scale Time Asymmetry for Detecting the Breakage of Slug Flow Structure
HAO Qing-Yang, JIN Ning-De** , HAN Yun-Feng, GAO Zhong-Ke, ZHAI Lu-Sheng
School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072
Abstract ：We first employ multi-scale time asymmetry (MSA) to analyze typical chaotic signals from Schuster maps and indicate that the MSA method can characterize the distinct time asymmetry of chaotic time series. Then we propose a modified MSA method, i.e., multi-scale weighted time asymmetry, and a novel time asymmetry index to investigate fractal Brownian motion signals and demonstrate its effects on discriminating between fractal signals with different Hurst exponents. Considering that the dynamic behavior of slug flow exhibits chaotic features, we apply the MSA method to analyze experimental signals from a gas-liquid two-phase flow and find that slug flow presents a unique time asymmetric structure. In addition, we further explore the mechanism leading to the formation of time asymmetry in terms of adaptive optimal kernel time-frequency representation. The results suggest that the MSA method can be a useful tool for detecting the complex flow structure underlying a gas-liquid two-phase flow.
出版日期: 2015-01-12
[1] Dukler A E and Hubbard M G 1975 Ind. Eng. Chem. Fundam. 14 337 2003 Int. J. Multiphase Flow 29 97 1977 Int. J. Multiphase Flow 3 585 2006 Chem. Eng. Sci. 61 7336 2006 Chin. J. Chem. Eng. 14 626 2000 J. Pet. Sci. Eng. 27 59 2006 Chem. Eng. Sci. 61 665 Acta Phys. Sin. 61 104701 (in Chinese)2011 J. Membr. Sci. 384 184 1995 Phys. Rev. Lett. 75 2308 1991 Int. J. Multiphase Flow 17 545 2001 Int. J. Multiphase Flow 27 1579 2010 Chem. Eng. Sci. 65 5256 J. Shanghai Jiaotong Univ. 42 1247 (in Chinese)Acta Phys. Sin. 59 7623 (in Chinese)Acta Phys. Sin. 60 049202 (in Chinese)Acta Phys. Sin. 60 118702 (in Chinese)1990 Int. J. Multiphase Flow 16 1117 Acta Phys. Sin. 60 014701 (in Chinese)Acta Phys. Sin. 62 140505 (in Chinese)2012 Physica A 391 3005 2005 Phys. Rev. Lett. 95 198102 2008 Cardiovasc. Eng. 8 88 2007 Phys. Rev. Lett. 98 094101 2007 Chaos Solitons Fractals 32 1649 2008 Phys. Rev. E 77 066204 2010 Physica A 389 754 2011 Med. Eng. Phys. 33 633 Acta Phys. Sin. 61 030506 (in Chinese)Acta Phys. Sin. 58 4485 (in Chinese)1995 IEEE Trans. Signal Process. 43 2361 2011 Chin. J. Chem. Eng. 19 243
[1]
.
[2]
.
[3]
.
[4]
.
[5]
.
[6]
.
[7]
.
[8]
.
[9]
.
[10]
.
[11]
.
[12]
.
[13]
.
[14]
.
[15]
.
2014, Vol. 31 
