気液二相流の主流動様式と気相変動の統計パラメータ空間における特性

概要

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Flow pattern identification using gas-phase fluctuations is studied analytically. The fundamental waveform of periodic gas-phase or void fraction fluctuations for steady two-phase flow is assumed based on the real waveform of gas-phase fluctuations. The structure of the fundamental wave includes some main flow patterns. Thus the statistical parameter characteristics are directly related to flow structure. That is, the parameter characteristics on the parameter space are revealed, because the parameters of the assumed fluctuations can be calculated for given flow patterns. The results show that for slug or plug flow the relationship between the mean and the standard deviation is described by an equation of a half circle, and that the relationship between the coefficients skewness and excess is described by a quadratic equation in those flows. For bubble, annular or separated flow, the coefficient of skewness is larger than zero, because the flow has a flat or direct-current-like part in the fundamental waveform.
社団法人日本機械学会の論文
1995-06-25