Physics of melt extraction: theory, implications and applications

1993 ◽  
Vol 342 (1663) ◽  
pp. 23-41 ◽  
Keyword(s):  
Two Phase Flow ◽  
Small Scale ◽  
Phase Flow ◽  
Two Phase ◽  
Melt Extraction ◽  
Deformable Porous Media ◽  
Ocean Ridges ◽  
Matrix Deformation ◽  
Extraction Processes ◽  
Magma Migration

This paper presents a general overview of flow in deformable porous media with emphasis on melt extraction processes beneath mid-ocean ridges. Using a series of simple model problems, we show that the equations governing magma migration have two fundamentally different modes of behaviour. Compressible two-phase flow governs the separation of melt from the solid and forms a nonlinear wave equation that allows melt to propagate in solitary waves. Incompressible two-phase flow governs small-scale mantle convection driven by lateral variations in melt content. The behaviour of both compressible and incompressible matrix deformation is demonstrated in the context of mid-ocean ridges to show that both mechanisms may explain the observation of the narrowness of ridge volcanism. These results also suggest that melt extraction is an inherently time dependent process that may account for the timing, volume and chemistry of volcanism.

scholarly journals Invasion patterns during two-phase flow in deformable porous media

2015 ◽  
Vol 3 ◽  
Author(s):  
Fredrik K. Eriksen ◽  
Renaud Toussaint ◽  
Knut J. Måløy ◽  
Eirik G. Flekkøy
Keyword(s):  
Porous Media ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Deformable Porous Media ◽  
Invasion Patterns

Evaluation of Length Scales and Meshing Requirements for Resolving Two-Phase Flow Regime Transitions Using the Level Set Method

2021 ◽  
Author(s):  
Matt Zimmer ◽  
Igor A Bolotnov
Keyword(s):  
Thin Films ◽  
Flow Regime ◽  
Level Set Method ◽  
Level Set ◽  
Two Phase Flow ◽  
Small Scale ◽  
Phase Flow ◽  
Two Phase ◽  
Interface Capturing ◽  
Regime Transitions

Abstract New criteria for fully resolving two-phase flow regime transitions using direct numerical simulation with the level set method for interface capturing are proposed. A series of flows chosen to capture small scale interface phenomena are simulated at different grid refinements. These cases include droplet deformation and breakup in a simple shear field, the thin film around a Taylor bubble, and the rise of a bubble towards a free surface. These cases cover the major small scale phenomena observed in two-phase flows: internal recirculation, interface curvature, interface snapping, flow of liquid in thin films, and drainage/snapping of thin films. The results from these simulations and their associated grid studies were used to develop new meshing requirements for simulation of two-phase flow using interface capturing methods, in particular the level set method. When applicable, the code used in this work, PHASTA, was compared to experiments in order to contribute to the ongoing validation process of the code. Results show that when the solver meets these criteria, with the exception of resolving the nanometer scale liquid film between coalescing bubbles, the code is capable of accurately simulating interface topology changes.

A New Streamline Method for Evaluating Uncertainty in Small-Scale, Two-Phase Flow Properties

SPE Journal ◽  
2003 ◽  
Vol 8 (01) ◽  
pp. 32-40
Author(s):  
J.J. Hastings ◽  
A.H. Muggeridge ◽  
M.J. Blunt
Keyword(s):  
Two Phase Flow ◽  
Small Scale ◽  
Phase Flow ◽  
Flow Properties ◽  
Two Phase ◽  
Streamline Method

Two Phase Gas-Liquid Bubbly Flow Modeling in Vertical Mini Pipe

2010 ◽  
Author(s):  
M. H. Kebriaee ◽  
H. Karabi ◽  
S. Khorsandi ◽  
M. H. Saidi
Keyword(s):  
Void Fraction ◽  
Two Phase Flow ◽  
Bubbly Flow ◽  
Superficial Velocity ◽  
Small Scale ◽  
High Heat Flux ◽  
Phase Flow ◽  
Bubble Shape ◽  
Pipe Axis ◽  
Two Phase

Studies on two-phase flow in small scale pipes have become more important, because of the application of mini-scale devices in several engineering fields including, high heat-flux compact heat exchangers, and cooling systems of various types of equipment. In a mini pipe the behavior of two phase flow is not the same as flow in conventional pipes. The difference is caused by different effective forces; for e. g. inside a mini pipe capillary forces are more important in comparison with gravitational forces. This paper is devoted to numerical simulation of gas-liquid two phase flow in a vertical mini pipe. Prediction of bubble shape and the effects of gas and liquid velocities on flow characteristics are considered. Also simulation involves prediction of changes in average void fraction along pipe axis. Numerical simulations in this paper are performed by a designed and developed CFD package which is based on Eulerian-Eulerian approach. The governing equations which are solved in the CFD package are momentum, continuity and Fractional Volume of Fluid (VOF) function equations. The fluid is assumed to be viscous and incompressible. The pressure-velocity coupling is obtained using the SIMPLEC algorithm. The geometry, which have been studied in this paper, is a D = 1.02 mm pipe, with 500 mm height. Bubble shape and the distribution of void fraction in a mini pipe are related to many parameters such as: gas and liquid velocities, pressure losses and etc. Since these mechanisms vary over time, time-average value of void fraction is used. Comparisons between Numerical results and experimental work which performed by hibiki et al. [1] indicated good agreement. Also results have shown that the present model is capable to simulate the behavior of nitrogen-water two phase flow in a mini pipe with acceptable accuracy. Furthermore, the results indicates that average void fraction along the pipe axis is related to the height and nitrogen superficial velocity. Also it is observed that at constant nitrogen superficial velocities, average void fraction decreases with water superficial velocity increments.

Two-Phase Flow-Induced Forces on Bends in Small Scale Tubes

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
M. F. Cargnelutti ◽  
S. P. C. Belfroid ◽  
W. Schiferli
Keyword(s):  
Experimental Data ◽  
Structural Integrity ◽  
Two Phase Flow ◽  
Experimental Results ◽  
Small Scale ◽  
Phase Flow ◽  
Momentum Exchange ◽  
Two Phase ◽  
Worst Case ◽  
Good Agreement

Two-phase flow occurs in many situations in industry. Under certain circumstances, it can be a source of flow-induced vibrations. The forces generated can be sufficiently large to affect the performance or efficiency of an industrial device. In the worst-case scenario, the mechanical forces that arise may endanger structural integrity. Thus, it is important to take these forces into account in designing industrial machinery to avoid problems during operation. Although the occurrence of such forces is well known, not much is known about their magnitudes because, unfortunately, the amount of experimental data available in literature are rather limited. This paper describes the experiments performed to measure forces in 6 mm diameter tubing containing a bend. Experiments are performed on bends of different radii, with the bend positioned horizontally or vertically. The experimental results are analyzed based on flow regime and bend configuration. A comparison with available experimental results for bigger internal pipe diameter shows a general good agreement. To improve future predictions, a simple model based on momentum exchange is proposed to estimate the forces generated by multiphase flow. The proposed model shows a good agreement with the experimental data.

Investigation of Centrifugal Pump Performance Under Two-Phase Flow Conditions

1995 ◽  
Vol 117 (1) ◽  
pp. 129-137 ◽  
Author(s):  
G. R. Noghrehkar ◽  
M. Kawaji ◽  
A. M. C. Chan ◽  
H. Nakamura ◽  
Y. Kukita
Keyword(s):  
Centrifugal Pump ◽  
Nuclear Reactor ◽  
Two Phase Flow ◽  
Fluid Model ◽  
Small Scale ◽  
Phase Flow ◽  
Flow Conditions ◽  
Two Phase ◽  
Pump Impeller ◽  
Pump Head

A one-dimensional two-fluid model has been used to study the centrifugal pump head degradation phenomena and to analyze the gas-liquid interaction within the pump impeller under high pressure, steam-water two-phase flow conditions. The analytical model was used to predict the two-phase pump head data for the small-scale and full-scale nuclear reactor pumps and the predictions of the head degradation compared favorably with the test data for different suction void fractions. The physical mechanisms responsible for head degradation were also investigated.

Numerical modeling of two-phase flow in deformable porous media: application to CO$$_2$$ injection analysis in the Otway Basin, Australia

2021 ◽  
Vol 80 (3) ◽  
Author(s):  
Taehyun Kim ◽  
Chan-Hee Park ◽  
Norihiro Watanabe ◽  
Eui-Seob Park ◽  
Jung-Wook Park ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Porous Media ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Deformable Porous Media
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