scholarly journals Two-Phase Flow in Geothermal Wells: Development and Uses of a Good Computer Code

1983 ◽  
Author(s):  
Jaime Ortiz-Ramirez
Keyword(s):  
Two Phase Flow ◽  
Computer Code ◽  
Phase Flow ◽  
Two Phase ◽  
Geothermal Wells

scholarly journals Modelling of two-phase flow inside geothermal wells

1993 ◽  
Vol 17 (5) ◽  
pp. 236-245 ◽  
Author(s):  
P.K. Chadha ◽  
M.R. Malin ◽  
A. Palacio-Perez
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Geothermal Wells

Evaluation of Void Fraction Correlations for the Statistical and Numerical Analysis of Two-Phase Flows Inside Producing Geothermal Wells

2008 ◽  
Author(s):  
A. A´lvarez del Castillo ◽  
E. Santoyo ◽  
O. Garci´a-Valladares ◽  
P. Sa´nchez-Upton
Keyword(s):  
Void Fraction ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Temperature Gradients ◽  
Production Performance ◽  
Phase Flow ◽  
Two Phase ◽  
Precise Knowledge ◽  
Geothermal Wells ◽  
Gas Void Fraction

The modeling of heat and fluid flow inside two-phase geothermal wells is a vital task required for the study of the production performance. Gas void fraction is one of the crucial parameters required for a better prediction of pressure and temperature gradients in two-phase geothermal wells. This parameter affects the correct matching between simulated and measured data. Modeling of two-phase flow inside wells is complex because two phases exist concurrently (exhibiting various flow patterns that depend on their relative concentrations, the pipe geometry, and the mass flowrate). A reliable modeling requires the precise knowledge of the two-phase flow patterns (including their transitions and some flow parameters). In this work, ten empirical correlations were used to estimate the gas void fraction in vertical-inclined pipes, and to evaluate their effect on the prediction of two-phase flow characteristics of some Mexican geothermal wells. High quality downhole pressure/ temperature logs collected from four producing geothermal wells were studied [Los Azufres, Mich. (Az-18); Los Humeros, Pue. (H-1), and Cerro Prieto, B.C. (M-90 and M-201)]. The pressure/ temperature gradients were simulated using an improved version of the wellbore simulator GEOPOZO, and the gas void fraction correlations. The simulated results were statistically compared with measured field data.

The Research of Flow Instability in Vertical Parallel Natural Circulation Channels Based on Relap5

2013 ◽  
Author(s):  
Jingjing Li ◽  
Tao Zhou ◽  
Mingqiang Song ◽  
Yanping Huang
Keyword(s):  
Two Phase Flow ◽  
Single Channel ◽  
Flow Instability ◽  
Natural Circulation ◽  
Computer Code ◽  
Phase Flow ◽  
Flow Oscillation ◽  
Two Phase ◽  
Best Estimate ◽  
Estimate System

The gas-liquid two phase flow oscillation in vertical parallel natural circulation channels was performed by the best estimate system computer code Relap5. The effects of symmetry and dissymmetry degree of heated power to flow oscillation and the effects of symmetry and dissymmetry throttling to flow oscillation were researched. The results says that when the twin channels under the same conditions of geometry and boundary, the parameters of the twin channel such as flow are the same. So under these conditions the twin channels can be researched as single channel. It is more possible of flow oscillation for the channels under condition of dissymmetry heating. The use of throttling will make the channels more stable, it is more stable when the throttling coefficient increases. With the implement of dissymmetry throttling, the system is possible for out of phase flow oscillation.

The KORSAR Computer Code Modeling of Stratified Two-Phase Flow Hydrodynamics in Horizontal Pipes

2002 ◽  
Author(s):  
Yu. V. Yudov
Keyword(s):  
Two Phase Flow ◽  
Computer Code ◽  
Phase Flow ◽  
Two Phase ◽  
Development Activity ◽  
Horizontal Pipes ◽  
Best Estimate ◽  
Accident Conditions ◽  
Code Development

The KORSAR best estimate computer code has been developed at NITI since 1996. It is designed to numerically simulate transient and accident conditions in VVER-type reactors /1/. From 1999 and on, the code development activity has been coordinated by the Center for Computer Code Development under Russia’s Minatom.

A two-phase flow model for geothermal wells in the presence of non-condensable gas

Geothermics ◽  
1982 ◽  
Vol 11 (3) ◽  
pp. 175-191 ◽  
Author(s):  
A. Barelli ◽  
R. Corsi ◽  
G. Del Pizzo ◽  
C. Scali
Keyword(s):  
Flow Model ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Geothermal Wells

Analysis of Two-Phase Flow Instability in Multi-Channel System

2014 ◽  
Author(s):  
Genglei Xia ◽  
Minjun Peng ◽  
Du Xue
Keyword(s):  
Two Phase Flow ◽  
Flow Instability ◽  
Saturation Pressure ◽  
Computer Code ◽  
Phase Flow ◽  
Parallel Channel ◽  
Multichannel System ◽  
Two Phase ◽  
Forced Circulation ◽  
Channel System

Ledinegg instability is one of the most important static instabilities for two phase flow system, especially in microchannel systems. In this paper, the force circulation two phase flow instability in vertical multi-channel system is performed by the best estimate system computer code RELAP5. The process and inherent reason of flow instability between multichannel system (FIBM) and flow excursion in forced circulation parallel channel system are analyzed. The effects of main operating parameters related to static onset of flow instability are investigated. Inlet subcooling, inlet restrictor, and saturation pressure are sensitive to the stability of parallel channel system.

Analysis of Two-Phase Flow Instability for Steam Generator

2008 ◽  
Author(s):  
Su-Xia Hou ◽  
Yun Tai ◽  
Fu-Yu Zhao
Keyword(s):  
Steam Generator ◽  
Nuclear Reactor ◽  
Two Phase Flow ◽  
Flow Instability ◽  
Computer Code ◽  
Frequency Domain Method ◽  
Phase Flow ◽  
Steam Generators ◽  
Two Phase ◽  
The Stability

Two-phase flow instability is an important problem that affects the running of steam generators in nuclear reactor systems. In this paper, two-phase flow instability in parallel channels of a steam generator are analyzed to disclose the mechanism of flow instability by using the frequency domain method. The mathematical expressions of heat transfer and flow for a steam generator are proposed, and the transfer function of the closed-loop system is deduced by using linearization and Laplace transfer. The steam generator’s stability is judged according to Nyquist stability criterion. Depending on this fundamental principal, the computer code is developed to analyze the stability of steam generators. The results displayed two conclusions; firstly, the increase of inlet orifices or mass flow rate enhances the stability of generator steam; secondly, the coupling interactions between channels and their external loop effects on the stability of generator steam are not ignored. The result show that the effects are non-monotonic on the stability of generator steam.

scholarly journals Flow in geothermal wells. Part IV. Transition criteria for two-phase flow patterns

1980 ◽  
Author(s):  
Z. Bilicki ◽  
J. Kestin
Keyword(s):  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Geothermal Wells ◽  
Transition Criteria

FLICA-4: a three-dimensional two-phase flow computer code with advanced numerical methods for nuclear applications

2000 ◽  
Vol 200 (1-2) ◽  
pp. 139-155 ◽  
Author(s):  
I. Toumi ◽  
A. Bergeron ◽  
D. Gallo ◽  
E. Royer ◽  
D. Caruge
Keyword(s):  
Numerical Methods ◽  
Two Phase Flow ◽  
Three Dimensional ◽  
Computer Code ◽  
Phase Flow ◽  
Two Phase ◽  
Nuclear Applications
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