Wall shear measurements by electrochemical probe for gas-liquid two-phase flow in vertical duct

AIChE Journal ◽  
1984 ◽  
Vol 30 (2) ◽  
pp. 338-341 ◽  
Author(s):  
G. Cognet ◽  
M. Lebouche ◽  
M. Souhar
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Electrochemical Probe ◽  
Wall Shear ◽  
Vertical Duct

Gas/Liquid Two-phase Flow in a Flat Sheet Filtration Module: Measurement of Local Wall Shear Stresses

2008 ◽  
Vol 81 (3-4) ◽  
pp. 771-775 ◽  
Author(s):  
Gaëlle Ducom ◽  
François-Pierre Puech ◽  
Corinne Cabassud
Keyword(s):  
Two Phase Flow ◽  
Shear Stresses ◽  
Phase Flow ◽  
Two Phase ◽  
Flat Sheet ◽  
Wall Shear

Two-Phase Flow in an Annular Channel With an Obstacle

2012 ◽  
Author(s):  
O. N. Kashinsky ◽  
P. D. Lobanov ◽  
A. S. Kurdyumov ◽  
N. A. Pribaturin
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Three Dimensional ◽  
Annular Channel ◽  
Electrochemical Technique ◽  
Phase Flow ◽  
Two Phase ◽  
Wall Shear

Experimental study of gas-liquid two-phase flow in an annular channel is performed. The channel consisted of two coaxial tubes with the diameters of 42 and 20 mm. An obstacle covering a quarter of the channel section was placed in the channel to produce a strong three-dimensional disturbance of the flow. Gas-liquid flow was produced by injecting air bubbles at the channel entrance through a special mixer. Measurements of local wall shear stress are performed using an electrochemical technique. Measurements of time-averaged and fluctuational wall shear stress are performed at various points relative to the obstacle, this allowed to study the field of the hydrodynamic parameters of the flow. Local void fraction is measured using a conductivity probe which traversed across the channel. The distribution of local void fraction in the region downstream the obstacle is obtained. Increased values of local void fraction in the region close to the obstacle are detected. The experimental data obtained can be used for validation of existing and developing computer codes accounting for a 3-D structure of two-phase flows.

Development of a Transient Mechanistic Two-Phase Flow Model for Wellbores

SPE Journal ◽  
2012 ◽  
Vol 17 (03) ◽  
pp. 942-955 ◽  
Author(s):  
Mahdy Shirdel ◽  
Kamy Sepehrnoori
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Two Phase Flow ◽  
Fluid Model ◽  
Flow Regimes ◽  
Phase Flow ◽  
Two Phase ◽  
Wall Shear ◽  
Two Fluid Model ◽  
Two Fluid

Summary A great deal of research has been focused on transient two-phase flow in wellbores. However, there is lack of a comprehensive two-fluid model in the literature. In this paper, we present an implementation of a pseudo-compositional, thermal, fully implicit, transient two-fluid model for two-phase flow in wellbores. In this model, we solve gas/liquid mass balance, gas/liquid momentum balance, and two-phase energy balance equations to obtain five primary variables: liquid velocity, gas velocity, pressure, holdup, and temperature. This simulator can be used as a stand-alone code or can be used in conjunction with a reservoir simulator to mimic wellbore/reservoir dynamic interactions. In our model, we consider stratified, bubbly, intermittent, and annular flow regimes using appropriate closure relations for interphase and wall-shear stress terms in the momentum equations. In our simulation, we found that the interphase and wall-shear stress terms for different flow regimes can significantly affect the model's results. In addition, the interphase momentum transfer terms mainly influence the holdup value. The outcome of this research leads to a more accurate simulation of multiphase flow in the wellbore and pipes, which can be applied to the surface facility design, well-performance optimization, and wellbore damage estimation.

Wall Shear Prediction for Wavy and Annular Air-Water Two-Phase Flow

2008 ◽  
Author(s):  
DuWayne Schubring ◽  
Andrea C. Ashwood ◽  
Timothy A. Shedd
Keyword(s):  
Two Phase Flow ◽  
Absolute Error ◽  
Phase Flow ◽  
Two Phase ◽  
Roughness Model ◽  
Total Mass Flux ◽  
Film Roughness ◽  
Wall Shear ◽  
Consistent Basis ◽  
Number Form

Non-intrusive pressure drop, film thickness, and wave behavior measurements have been performed for horizontal air-water two-phase flow in round tubes. A databank of over 300 flow conditions in the wavy, wavy-annular, and annular regimes was compiled for three tube diameters (8.8 mm, 15.1 mm, and 26.3 mm). A correlation was developed based on the product of total mass flux, gas superficial velocity, and an empirical friction factor, selected from the lesser of a modified Froude number form and a Reynolds number form. This correlation performed to within 11% mean absolute error across the data range considered. A variety of correlations were also selected from the literature for comparison. Those based on film roughness (Wallis, Hurlburt-Newell), two-phase multipliers (Lockhart-Martinelli, Friedel, Chisholm, Olujic, and Gro¨nnerud), and empirical data fits (Mu¨ller-Steinhagen and Heck) were among those tested. As needed, correlations were rephrased in terms of wall shear to provide a consistent basis for comparison. A complex film roughness model (Hurlburt et al.) was also compared to the experimental data.

Annular Two-Phase Flow—Part 1: A Simple Theory

1970 ◽  
Vol 92 (1) ◽  
pp. 59-72 ◽  
Author(s):  
G. B. Wallis
Keyword(s):  
Pressure Drop ◽  
Two Phase Flow ◽  
Simple Theory ◽  
Shear Stresses ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Regime Transition ◽  
Flow Part ◽  
Numerous Data ◽  
Wall Shear

A simple theory for annular two-phase flow is developed in terms of equations for the interfacial and wall shear stresses. Expressions for the pressure drop and void fraction are derived. Criteria for the minimum pressure drop, zero wall shear, and flow regime transition in vertical flow are given. The results are compared with numerous data and alternative theories from the literature.

Development of a wall shear stress integral measurement and analysis system for two-phase flow boundary layers

2006 ◽  
Vol 77 (10) ◽  
pp. 105103 ◽  
Author(s):  
Elvis E. Dominguez-Ontiveros ◽  
Carlos E. Estrada-Perez ◽  
Javier Ortiz-Villafuerte ◽  
Yassin A. Hassan
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Boundary Layers ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Boundary ◽  
Measurement And Analysis ◽  
Wall Shear ◽  
Analysis System

Wall shear stress measurements in vertical air-water annular two-phase flow

1989 ◽  
Vol 15 (3) ◽  
pp. 307-325 ◽  
Author(s):  
A.H. Govan ◽  
G.F. Hewitt ◽  
D.G. Owen ◽  
G. Burnett
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Stress Measurements ◽  
Wall Shear

Numerical Study of Flow Dynamics in Human Eye Vitreous Chamber After Vitrectomy and Gas Tamponade

2015 ◽  
Author(s):  
Ali Yousefi ◽  
Omid Abouali ◽  
Ebrahim Ghoshtasbi Rad ◽  
Goodarz Ahmadi
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Two Phase Flow ◽  
Numerical Study ◽  
Maximum Shear Stress ◽  
Phase Flow ◽  
Two Phase ◽  
Human Eye ◽  
Gas Tamponade ◽  
Wall Shear

The purpose of this study is to evaluate the flow pattern and the fluid shear stress acting on the retinal wall in a human eye vitreous chamber after Vitrectomy and gas tamponade including the effect of saccadic eye movements. The correlation between the maximum shear stress induced on the retinal wall and the gas fill fraction (GF) and saccade amplitudes was investigated. In modeling the geometry of vitreous chamber cavity, the indentation of the lens was taken into account. The two-phase flow at the recovery phase of the operation was modeled numerically. Unsteady three-dimensional forms of continuity and Navier-Stokes equations were solved. Volume-of-fluid method was used to solve the two-phase flow in the eye. Saccadic motion of the eye was modeled using the dynamic mesh technique. The numerical model was validated by comparing the results with the available analytical solutions and experimental data for a spherical model. Then, numerical simulation was performed based on the deformed sphere configuration, representing a more realistic model of vitreous chamber cavity. The simulation results were compared with the available numerical studies for the spherical geometry. Then the wall shear stress on the retina was computed and compared for various gas fractions. The potential effect of wall shear stress on the retinal detachment and the need for post-operation posturing in all studied cases were discussed.

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