Two Dimensional Hydro Dynamic and Thermal Modeling of a Turbulent Two Phase Stratified Gas-Liquid Pipe Flow

2009 ◽  
Author(s):  
Z. Mansoori ◽  
Z. Tayarani Yoosefabadi ◽  
M. Saffar-Avval ◽  
F. Behzad ◽  
G. Ahmadi
Keyword(s):  
Pipe Wall ◽  
Interfacial Shear Stress ◽  
Equation Model ◽  
Accurate Solution ◽  
Two Dimensional ◽  
Two Phase ◽  
Perfect Agreement ◽  
High Reynolds ◽  
Gas Liquid Flow ◽  
Energy Equations

A numerical model for solving a fully developed, turbulent, smooth stratified two-phase gas-liquid flow in pipeline is developed. This model is capable to determine pressure drop and liquid height. In addition wall and interfacial shear stress, flow field and temperature field for both phases could be predicted successfully. The method solves the two dimensional momentum and energy equations for both phases and accounts for the effects of turbulence through the use of high Reynolds k – ε two-equation model of turbulence. The bipolar coordinate system is aided to fit the pipe wall and the interface. Also, grid refinement near the interface and near the pipe wall was used for accurate solution near the boundaries. The predicted data by this method is compared with some available Experimental data as well as one and two dimensional modeling results. It is concluded that a perfect agreement between this model and experimental results could be achieved and the ability of this model for prediction of data is more acceptable than one and some two dimensional models. In conclusion this model could have important application for optimization of transportation rates and estimation of corrosion in pipeline.

Complete Transient Two-Dimensional Analysis of Two-Phase Closed Thermosyphons Including the Falling Condensate Film

1994 ◽  
Vol 116 (2) ◽  
pp. 418-426 ◽  
Author(s):  
C. Harley ◽  
A. Faghri
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Conjugate Heat Transfer ◽  
Pipe Wall ◽  
Vapor Flow ◽  
Two Dimensional ◽  
Type Solution ◽  
Two Phase ◽  
Condensate Film ◽  
Good Agreement

A transient two-dimensional thermosyphon model is presented that accounts for conjugate heat transfer through the wall and the falling condensate film. The complete transient two-dimensional conservation equations are solved for the vapor flow and pipe wall, and the liquid film is modeled using a quasi-steady Nusselt-type solution. The model is verified by comparison with existing experimental data for a low-temperature thermosyphon with good agreement. A typical high-temperature thermosyphon was then simulated to examine the effects of vapor compressibility and conjugate heat transfer.

Two-Dimensional Rotating Heat Pipe Analysis

1995 ◽  
Vol 117 (1) ◽  
pp. 202-208 ◽  
Author(s):  
C. Harley ◽  
A. Faghri
Keyword(s):  
Pipe Wall ◽  
Thin Liquid Film ◽  
Interfacial Shear Stress ◽  
Heat Pipes ◽  
Interfacial Shear ◽  
Vapor Flow ◽  
Two Dimensional ◽  
Unsteady Heat Conduction ◽  
Liquid Condensate ◽  
Transient Numerical Simulation

A detailed transient numerical simulation of rotating heat pipes is presented. This two-dimensional, axisymmetric formulation accounts for the thin liquid condensate film on the inner surface of the rotating pipe wall, the vapor flow in the vapor space, and the unsteady heat conduction in the pipe wall. The thin liquid film is coupled to the vapor velocity at the liquid–vapor interface, and the effects of the vapor pressure drop and the interfacial shear stress are included in the Nusselt-type condensation analysis.

Modeling of Transient Two-Phase Flow in a Well After Startup of Electrical Submersible Pump

2002 ◽  
Author(s):  
Oscar Ruiz-Maldonado ◽  
Yuri V. Fairuzov
Keyword(s):  
Two Phase Flow ◽  
Equation Model ◽  
Phase Flow ◽  
Submersible Pump ◽  
Centrifugal Pumps ◽  
Two Phase ◽  
Drift Flux Model ◽  
Drift Flux ◽  
Electrical Submersible Pump ◽  
Gas Liquid Flow

A numerical model of transient two-phase in a wellbore after startup of electrical submersible pump (ESP) was developed in the present study. The model consists of three modules. The first module, the wellbore model, predicts two-phase gas-liquid flow in the wellbore. The second module describes performance characteristics of centrifugal pumps. The third module, the reservoir model, predicts the variable well inflow after startup of the pump. The wellbore model is based on a drift-flux model (three equation model) of two-phase flow. The relative velocity is determined using a flow regime-dependent slip correlation or a mechanistic steady flow model. Field data collected during a startup of an ESP well were analyzed. This analysis showed that the response of the system to the ESP startup is governed by dynamic interacticn between the well and reservoir. The results obtained can be used for the development of production startup or restart procedures for wells equipped with ESP systems.

A Modified Model for Predicting Flow Regime Transitions in Horizontal Gas-Liquid Flow

1999 ◽  
Author(s):  
N. H. Mostafa ◽  
E. S. El Mitwally ◽  
A. A. El Desoky
Keyword(s):  
Shear Stress ◽  
Flow Regime ◽  
Two Phase Flow ◽  
Liquid Velocity ◽  
Interfacial Shear Stress ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Gas Liquid Flow ◽  
Different Diameters

Abstract A Theoretical model for identifying the flow regime transition of air-water two-phase flow in a horizontal pipe is presented. In this work, when mapping the two-phase flow, the nonuniform liquid-to-wall shear stress around the pipe circumference and the interfacial shear stress were taken into consideration. This model was found in agreement with the experimental map of Mandhane et al. (1974) and the Modified Baker map (Ball et al. 1970) for mapping the two-phase flow. The proposed model is plotted for different pipe diameters. The superficial liquid velocity was found to increase four times in the stratified and bubble flow regimes when the pipe diameter was increased from 2.5 to 5 cm. This model enables for any user for working in different diameters.

Pulse Antennas: Accurate Solution of Two-Dimensional Model Problems for Structures with Gratings as Dispersive Elements

2001 ◽  
Vol 55 (8) ◽  
pp. 14
Author(s):  
A. I. Vyazmitinova ◽  
V. L. Pazynin ◽  
Andrei Olegovich Perov ◽  
Yurii Konstantinovich Sirenko ◽  
H. Akdogan ◽  
...  
Keyword(s):  
Accurate Solution ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model

Numerical modeling of the influence of bubbles on flow and heat transfer in the descending gas-liquid flow in a pipe

2012 ◽  
Vol 9 (1) ◽  
pp. 131-135
Author(s):  
M.A. Pakhomov
Keyword(s):  
Heat Transfer ◽  
Gas Phase ◽  
Liquid Flow ◽  
Bubble Diameter ◽  
Gas Content ◽  
Two Phase ◽  
Eulerian Description ◽  
Flow And Heat Transfer ◽  
Gas Liquid Flow ◽  
The Mathematical Model

The paper presents the results of modeling the dynamics of flow, friction and heat transfer in a descending gas-liquid flow in the pipe. The mathematical model is based on the use of the Eulerian description for both phases. The effect of a change in the degree of dispersion of the gas phase at the input, flow rate, initial liquid temperature and its friction and heat transfer rate in a two-phase flow. Addition of the gas phase causes an increase in heat transfer and friction on the wall, and these effects become more noticeable with increasing gas content and bubble diameter.

Features of spatial shock-wave flows in vapor-gas-liquid mixtures

2014 ◽  
Vol 10 ◽  
pp. 27-31
Author(s):  
R.Kh. Bolotnova ◽  
U.O. Agisheva ◽  
V.A. Buzina
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Shock Waves ◽  
Liquid Mixture ◽  
Liquid Mixtures ◽  
Pressure Vessels ◽  
Water Mixture ◽  
Two Dimensional ◽  
Nonstationary Processes ◽  
Two Phase

The two-phase model of vapor-gas-liquid medium in axisymmetric two-dimensional formulation, taking into account vaporization is constructed. The nonstationary processes of boiling vapor-water mixture outflow from high-pressure vessels as a result of depressurization are studied. The problems of shock waves action on filled by gas-liquid mixture volumes are solved.

Investigation of two-dimensional nonstationary processes of outflow a gas-saturated liquid from axisymmetric vessels

2012 ◽  
Vol 9 (1) ◽  
pp. 47-52
Author(s):  
R.Kh. Bolotnova ◽  
V.A. Buzina
Keyword(s):  
Comparative Analysis ◽  
Numerical Model ◽  
Liquid Mixture ◽  
Phase Model ◽  
Test Problems ◽  
Two Dimensional ◽  
Nonstationary Processes ◽  
Saturated Liquid ◽  
Two Phase ◽  
One Dimensional

The two-dimensional and two-phase model of the gas-liquid mixture is constructed. The validity of numerical model realization is justified by using a comparative analysis of test problems solution with one-dimensional calculations. The regularities of gas-saturated liquid outflow from axisymmetric vessels for different geometries are established.

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