scholarly journals Statistical properties of differential pressure fluctuations and flow patterns in horizontal gas-liquid two-phase flow (Differential pressure between the top and the bottom of a tube cross-section)

1986 ◽  
Vol 52 (478) ◽  
pp. 2337-2344 ◽  
Author(s):  
Goichi MATSUI ◽  
Toshihiko AIZAWA ◽  
Akiyasu MORITA
Keyword(s):  
Cross Section ◽  
Two Phase Flow ◽  
Pressure Fluctuations ◽  
Flow Patterns ◽  
Differential Pressure ◽  
Statistical Properties ◽  
Phase Flow ◽  
Two Phase ◽  
Tube Cross Section

scholarly journals Application of Chaos Theory in Identification of Two-Phase Flow Patterns and Transitions in a Small, Horizontal, Rectangular Channel

1996 ◽  
Vol 118 (2) ◽  
pp. 383-390 ◽  
Author(s):  
Y. Cai ◽  
M. W. Wambsganss ◽  
J. A. Jendrzejczyk
Keyword(s):  
Chaos Theory ◽  
Two Phase Flow ◽  
Rectangular Channel ◽  
Pressure Fluctuations ◽  
Fractal Dimensions ◽  
Flow Patterns ◽  
Deterministic System ◽  
Phase Flow ◽  
Two Phase ◽  
Measurement Tools

Various measurement tools that are used in chaos theory were applied to analyze two-phase pressure signals with the objective of identifying and interpreting flow pattern transitions for two-phase flows in a small, horizontal rectangular channel. These measurement tools included power spectral density function, autocorrelation junction, pseudo-phase-plane trajectory, Lyapunov exponents, and fractal dimensions. It was demonstrated that the randomlike pressure fluctuations characteristic of two-phase flow in small rectangular channels are chaotic, and governed by a high-order deterministic system. The correlation dimension is potentially a new approach for identifying certain two-phase flow patterns and transitions.

Measurement for Individual Gas-Liquid Two-Phase Flow Rates Based on Stochastic Features of Differential Pressure Fluctuation

2007 ◽  
Author(s):  
Tomomi Uchiyama ◽  
Hirokazu Tominaga ◽  
Kiyoshi Minemura
Keyword(s):  
Two Phase Flow ◽  
Pressure Fluctuations ◽  
Vortex Generator ◽  
Measuring Method ◽  
Differential Pressure ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Rates ◽  
Individual Phase ◽  
The Individual

This study proposes a measuring method for the individual phase flow rates of gas-liquid two-phase mixtures flowing through a pipe. First, the time-variations for pressure are measured at three points around a vortex generator mounted in the pipe under the known flow rates. Secondly, the stochastic features of the differential pressure fluctuations, such as the mean and the standard deviation, are calculated to construct a database relating the flow rates with the stochastic features. Consequently, if the differential pressure fluctuations are measured under unknown flow rates, the individual phase flow rates are successfully identified from the database. A neural network is employed for the identification. This study also applies the proposed method for the measurement of air-water two-phase flow and discusses the measured results.

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