통계적 보이드율계측에 의한 수직상향이상류의 유동양식과 보이드분포 분석

Analyses of the Flow Patterns and Void Distribution in Vertical Upward Two Phase Flow with the Statistical Void Fraction Measurement

An experimental study has been conducted to investigate characteristics of the flow patterns, its transitions and the mean local void fraction obtained from which the probe was traversed diametrically from center to wall of the test section in the vertical upward air-water flow for isothermal condition using the electrical conductivity probe. It has been shown that the probability density function of the mean local void fraction measured statistically from a Fast Fourier Transform becomes a criterion for the flow patterns and the mean local void fraction profile is a highly function of the flow patterns.