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http://dx.doi.org/10.3795/KSME-B.2004.28.11.1398

Flow Pattern Identification of Vertical Upward Two-Phase Flow Using the Attractor-Density-Map Analysis of the Void Fraction Signal in the Nonlinear Phase Space  

Kim, Nam-Seok (한동대학교 대학원 기계제어시스템공학부)
Lee, Jae-Young (한동대학교 기계제어시스템공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.11, 2004 , pp. 1398-1406 More about this Journal
Abstract
The nonlinear signals from an impedance meter for the area average void fraction in two-phase flow have been analyzed to construct a phase space trajectory. The pseudo phase space was constructed with the time delay and proper dimensions. The time delay and the embedding dimension were chosen by the average mutual information and by the false nearest neighborhood, respectively. The attractor-density-map of projected states was used to produce the two dimensional probability distribution functions (2D-PDF). Since the developed 2D-PDF showed clear distinction of the flow patterns, the flow regime identification was made with three rules and with the 2D-PDF. Also, the transition criteria of Mishima-Ishii agree well with the present results.
Keywords
Two-Phase flow; Nonlinear Analysis; Flow Identification; Impedance Signal; Void Fraction;
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