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

Investigation of the Flow Pattern Transition Behaviors of Viscous Oil–Water Flow in Horizontal Pipes

2020 ◽  
Vol 59 (47) ◽  
pp. 20892-20902
Author(s):  
Haili Hu ◽  
Jiaqiang Jing ◽  
Sara Vahaji ◽  
Jiatong Tan ◽  
Jiyuan Tu
Keyword(s):  
Flow Pattern ◽  
Water Flow ◽  
Horizontal Pipes ◽  
Viscous Oil ◽  
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.

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.

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.

Measuring Flow Pattern Asymmetry of Oil-Water Two Phase Flows Using Multi-channel Rotating Electric Field Conductance Signals

2018 ◽  
Vol 74 (1) ◽  
pp. 25-41 ◽  
Author(s):  
Yuansheng He ◽  
Yingyu Ren ◽  
Yunfeng Han ◽  
Ningde Jin
Keyword(s):  
Electric Field ◽  
Flow Pattern ◽  
Cross Section ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Time Asymmetry ◽  
Pipe Cross Section ◽  
Multi Scale ◽  
Oil Water

AbstractThe present study is a report on the asymmetry of dispersed oil phase in vertical upward oil-water two phase flow. The multi-channel signals of the rotating electric field conductance sensor with eight electrodes are collected in a 20-mm inner diameter pipe, and typical images of low pattern are captured using a high speed camera. With the multi-channel rotating electric field conductance signals collected at pipe cross section, multi-scale time asymmetry (MSA) and an algorithm of multi-scale first-order difference scatter plot are employed to uncover the fluid dynamics of oil-water two phase flow. The results indicate that MSA can characterise the non-linear behaviours of oil-water two phase flow. Besides, the MSA analysis also beneficial for understanding the underlying inhomogeneous distribution of the flow pattern in different directions at pipe cross section.

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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