A Model for Wetted-Wall Fraction and Gravity Center of Liquid Film in Gas/Liquid Pipe Flow

SPE Journal ◽  
2011 ◽  
Vol 16 (03) ◽  
pp. 692-697 ◽  
Author(s):  
Hong-Quan Zhang ◽  
Cem Sarica
Keyword(s):  
Liquid Film ◽  
Flow Pattern ◽  
Pipe Flow ◽  
Present Model ◽  
Stratified Flow ◽  
Gravity Center ◽  
Transition Prediction ◽  
Flow Pattern Transition ◽  
Circle Model ◽  
Geometrical Relationship

Summary The model presented in this study unifies the predictions of liquid wetted-wall fraction, film gravity center, and flow-pattern transition between stratified and annular flows. It is based on the instability of the liquid film in an equilibrium stratified flow proposed by Taitel and Dukler (1976) for flow-pattern transition prediction from stratified flow to nonstratified flows. The geometrical relationship between the wetted-wall fraction and the gravity center of the liquid film is established based on the double-circle model proposed by Chen et al. (1997), and is further simplified with explicit approximation. The predictions of the present model are compared and agree well with experimental wetted-wall-fraction measurements and flow-pattern observations from different authors.

Dimensionless oil-water stratified to non-stratified flow pattern transition

2017 ◽  
Vol 151 ◽  
pp. 284-291 ◽  
Author(s):  
A. Al-Sarkhi ◽  
E. Pereyra ◽  
I. Mantilla ◽  
C. Avila
Keyword(s):  
Flow Pattern ◽  
Stratified Flow ◽  
Flow Pattern Transition ◽  
Oil Water

Oil–Water Flow Pattern Transition Prediction in Horizontal Pipes

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Carlos F. Torres ◽  
Ram S. Mohan ◽  
Luis E. Gomez ◽  
Ovadia Shoham
Keyword(s):  
Flow Pattern ◽  
Water Flow ◽  
Prediction Models ◽  
Mechanistic Models ◽  
Horizontal Pipes ◽  
Transition Prediction ◽  
Physical Mechanisms ◽  
Flow Pattern Map ◽  
Flow Pattern Transition ◽  
Oil Water

Flow pattern transition prediction models are presented for oil–water flow in horizontal pipes. The transition between stratified and nonstratified flow is predicted using Kelvin–Helmholtz (KH) stability analysis for long waves. New, simplified, and more practical physical mechanisms/mechanistic models are proposed for the prediction of the transition boundaries to semidispersed and to fully dispersed flow. The proposed flow pattern classification significantly simplifies the flow pattern map for liquid–liquid flow and agrees well with the experimental data.

Gas-Liquid Stratified-Wavy Flow in Horizontal Pipelines

1997 ◽  
Vol 119 (4) ◽  
pp. 209-216 ◽  
Author(s):  
X. T. Chen ◽  
X. D. Cal ◽  
J. P. Brill
Keyword(s):  
Pressure Drop ◽  
Liquid Film ◽  
Pipe Flow ◽  
Interfacial Friction ◽  
Interfacial Behavior ◽  
Liquid Holdup ◽  
Liquid Loading ◽  
Two Phase ◽  
Natural Gas Transmission ◽  
Circle Model

Gas-liquid stratified-wavy flow with low liquid loading is common in natural gas transmission pipelines and offshore gas pipelines. This specific case of two-phase pipe flow has been studied experimentally and theoretically in the present paper. The interfacial behavior during air-kerosene stratified-wavy flow in a 77.9-mm-dia 420-m-long pipeline was observed carefully. The gas-liquid interface usually exhibits a concave downward curved configuration. The liquid film-wetted wall fraction, liquid holdup, and pressure drop were also measured. A mechanistic “double-circle” model and a correlation for interfacial friction factor, required as a closure relationship in the model, have been developed. The new model gives significantly improved predictions for both liquid holdup and pressure drop during gas-liquid stratified-wavy flow in horizontal pipelines.

Slug Dynamics in Gas-Liquid Pipe Flow

2000 ◽  
Vol 122 (1) ◽  
pp. 14-21 ◽  
Author(s):  
Hong-Quan Zhang ◽  
Subash S. Jayawardena ◽  
Clifford L. Redus ◽  
James P. Brill
Keyword(s):  
Pressure Gradient ◽  
Flow Pattern ◽  
Pipe Flow ◽  
Film Flow ◽  
Control Volume ◽  
Experimental Results ◽  
Liquid Holdup ◽  
Flow Pattern Transition ◽  
Slug Flows

The continuity and momentum equations for fully developed and spatially developing slug flows are established by considering the entire film zone as the control volume. They are used for the calculations of pressure gradient, slug frequency, liquid holdup in the film, flow pattern transition, slug dissipation, and slug tracking. Comparison with available experimental results shows that these equations correctly describe the slug dynamics in gas-liquid pipe flow. [S0195-0738(00)00701-9]

GAS-LIQUID FLOW-PATTERN TRANSITION IN HORIZONTAL PIPES – ANALYSIS OF REPORTED MODELS

2018 ◽  
Author(s):  
André Mendes Quintino ◽  
Davi Lotfi Lavor Navarro da Rocha ◽  
Oscar Mauricio Hernandez Rodriguez
Keyword(s):  
Flow Pattern ◽  
Liquid Flow ◽  
Horizontal Pipes ◽  
Flow Pattern Transition ◽  
Gas Liquid Flow

Spool Valve Hydraulic Measurement Flow Pattern Error Based on Variable Discharge Coefficient

2015 ◽  
Vol 667 ◽  
pp. 444-448
Author(s):  
Zhuo Lin
Keyword(s):  
Flow Pattern ◽  
Discharge Coefficient ◽  
Compensation Method ◽  
Measuring Process ◽  
Important Method ◽  
Flow Pattern Transition ◽  
Spool Valves ◽  
Spool Valve ◽  
Submerged Discharge

Spool valves are the main elements in electro-hydro servo valves. Hydraulic measurement is an important method for spool valve’s null cutting measuring process. Because of the flow pattern transition, the discharge coefficient is a variable. This phenomenon causes errors if we assume the discharge coefficient is a constant as we always do. In this paper, the variable discharge coefficient is considered to the submerged discharge equation, and the flow pattern error is defined. For improving the precision of overlap values measurements, a compensation method of flow pattern error is presented in this paper.

Flow-Pattern Transition and Hydrodynamic Modeling of Churn Flow

SPE Journal ◽  
1999 ◽  
Vol 4 (12) ◽  
Author(s):  
J. Tengesdal ◽  
A.S. Kaya ◽  
Cem Sarica
Keyword(s):  
Flow Pattern ◽  
Hydrodynamic Modeling ◽  
Flow Pattern Transition ◽  
Churn Flow
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