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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Differential pressure fluctuation and new identification method of two-phase flow pattern

Get access (open in a dialog) DOI: 10.1615/IHTC12.940
6 pages

Abstract

In this study, the dynamics characteristics of the flow patterns (bubble, slug, churn, and annular flow) and the transition regions were investigated in order to construct a new objective identification method of the flow pattern. The experiment was conducted under atmospheric pressure to investigate the isothermal two-phase flow pattern in a vertical pipe. The differential pressure fluctuation of the flow was measured by the differential pressure sensor, and the magnitude and the baseline of the fluctuation were noticed. The dynamic characteristics of the fluctuation were analyzed through the return map on which the extreme values of the fluctuation were plotted. The distribution on the map varied according to the flow pattern. The fractions of the dots on the map divided into 4 areas were calculated in order to identify the flow patterns. The correlation between air volumetric flux ratio and the fraction implied the characteristics of the flow patterns and the transition regions.