Momentum Flux in Two-Phase Flow

1969 ◽  
Vol 91 (3) ◽  
pp. 454-455 ◽  
Author(s):  
C. A. Prins
Keyword(s):  
Momentum Flux ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Two-Phase Flow Modeling in a Pipe Related to Flow-Induced Vibration

2005 ◽  
Author(s):  
W. G. Sim ◽  
N. W. Mureithi ◽  
M. J. Pettigrew
Keyword(s):  
Void Fraction ◽  
Power Law ◽  
Slug Flow ◽  
Momentum Flux ◽  
Two Phase Flow ◽  
Liquid Velocity ◽  
Fluid Dynamic ◽  
Phase Flow ◽  
Two Phase ◽  
Slip Ratio

To understand the fluid dynamic forces acting on a structure subjected to two-phase flow, it is essential to get detailed information about the characteristics of two-phase flow. The distributions of flow parameters across a pipe, such as gas velocity, liquid velocity and void fraction, may be assumed to follow a power law (Cheng 1998, Serizawa et al. 1975). The void fraction profile is, for example, uniform for bubbly flow while it is more or less parabolic for slug flow. In the present work, the average values of momentum flux, slip ratio, etc. are derived by integral analysis, based on approximate power law distributions. A parametric study with various distributions was performed. The existing empirical formulations for average void fraction, proposed by Wallis (1969), Zuber et al. (1967) and Ishii (1970), are considered to obtain the present results. In particular, the unsteady momentum flux for slug flow is approximated.

Characteristics of Two-Phase Flows in Vertical Pipe

2006 ◽  
Author(s):  
W. G. Sim ◽  
N. K. Mureithi ◽  
B. M. Bae ◽  
M. J. Pettigrew
Keyword(s):  
Slug Flow ◽  
Momentum Flux ◽  
Two Phase Flow ◽  
Liquid Velocity ◽  
Force Sensor ◽  
Phase Flow ◽  
Vertical Pipe ◽  
Two Phase ◽  
Flow Parameters ◽  
Excitation Mechanisms

The characteristics of two-phase flow in a vertical pipe are investigated to gain a better understanding of vibration excitation mechanisms. An analytical model for two-phase flow in a pipe was developed by Sim et al. (2005), based on a power law for the distributions of flow parameters across the pipe diameter, such as gas velocity, liquid velocity and void fraction. An experimental study was undertaken to verify the model. The unsteady momentum flux impinging on a ‘turning tee’ (or a ‘circular plate’) has been measured at the exit of the pipe, using a force sensor. From the measured data, especially for slug flow, the predominant frequency and the RMS value of the unsteady momentum flux have been evaluated. It is found that the analytical method, given by Sim et al. for slug flow, can be used to predict the momentum flux.

scholarly journals Momentum Flux in Two-Phase Flow

1968 ◽  
Vol 90 (2) ◽  
pp. 211-220 ◽  
Author(s):  
G. B. Andeen ◽  
P. Griffith
Keyword(s):  
Velocity Profile ◽  
Steady Flow ◽  
Momentum Flux ◽  
Two Phase Flow ◽  
Homogeneous Model ◽  
Phase Flow ◽  
Slip Model ◽  
Two Phase ◽  
Flow Models

Measurements of the momentum flux through a section of pipe with steam-water and air-water two-phase flow are reported. The results are used to evaluate the utility of various two-phase flow models and the underlying assumptions. The slip model was found to yield low values. The homogeneous model correlated the data well, but this is because of compensating errors in the assumptions. The steady flow assumption of most two-phase flow models is considered to be inadequate for prediction of the momentum flux at low quality. At higher quality the velocity profile is the dominant consideration.

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