Two-dimensional two-fluid model for air-oil wavy flow in horizontal tube

2019 ◽  
Vol 33 (6) ◽  
pp. 2693-2709 ◽  
Author(s):  
Hong-Cheol Shin ◽  
Hyeon-Seok Seo ◽  
Sung-Min Kim
Keyword(s):  
Fluid Model ◽  
Horizontal Tube ◽  
Two Dimensional ◽  
Two Fluid Model ◽  
Two Fluid

A NUMERICAL STUDY OF TWO-PHASE FLOW USING A TWO-DIMENSIONAL TWO-FLUID MODEL

2004 ◽  
Vol 45 (10) ◽  
pp. 1049-1066 ◽  
Author(s):  
Moon-Sun Chung ◽  
Seung-Kyung Pak ◽  
Keun-Shik Chang
Keyword(s):  
Two Phase Flow ◽  
Numerical Study ◽  
Fluid Model ◽  
Phase Flow ◽  
Two Dimensional ◽  
Two Phase ◽  
Two Fluid Model ◽  
Two Fluid

ELECTRON PARALLEL COMPRESSIBILITY IN THE NONLINEAR DEVELOPMENT OF TWO-DIMENSIONAL COLLISIONLESS MAGNETOHYDRODYNAMIC RECONNECTION

2006 ◽  
Vol 20 (16) ◽  
pp. 931-961 ◽  
Author(s):  
DANIELE DEL SARTO ◽  
F. CALIFANO ◽  
F. PEGORARO
Keyword(s):  
Magnetic Reconnection ◽  
Fluid Model ◽  
Density Fluctuations ◽  
Larmor Radius ◽  
Small Scale ◽  
Two Dimensional ◽  
Guide Field ◽  
Fluid Instabilities ◽  
Two Fluid Model ◽  
Two Fluid

Some topological aspects of the magnetic reconnection phenomenon are summarized and recent numerical results, derived within a two-fluid model, of two-dimensional collisionless magnetic reconnection in presence of a strong guide field are reported. Both the Alfvèn and the whistler frequency range are investigated by including electron parallel compressibility effects that are related respectively to thermal effects and to density fluctuations. The Hamiltonian character of the system is emphasized as it drives the small scale dynamics through the presence of topological invariants. These determine the formation and the shape of small scale current and vorticity layers inside the magnetic island. Secondary fluid instabilities, mainly of the Kelvin–Helmholtz type, can destabilize these layers when a hydrodynamic type regime is achieved. The inclusion of parallel electron compressibility has stabilizing effects. In view of the limitations of the two-fluid modelling, possible developments are briefly discussed such as the inclusion of Larmor-radius corrections, in lieu of a fully kinetic approach.

Refilling and Rewetting of a Hot Horizontal Tube: Part II—Structure of a Two-Fluid Model

1981 ◽  
Vol 103 (2) ◽  
pp. 287-292 ◽  
Author(s):  
A. M. C. Chan ◽  
S. Banerjee
Keyword(s):  
Fluid Model ◽  
Numerical Technique ◽  
Horizontal Tube ◽  
Simple Problem ◽  
Subsequent Paper ◽  
Horizontal Tubes ◽  
Two Fluid Model ◽  
Explicit Finite Difference ◽  
Two Fluid ◽  
Hydraulic Processes

This is the second paper in a series of three papers reporting on a study on refilling and rewetting of horizontal tubes. The experimental work has been reported in a previous paper (Chan and Banerjee [1]). This paper concentrates on development of a mathematical model for analysis of the main thermal-hydraulic processes. The resulting set of equations are solved numerically. An explicit finite difference characteristics technique is used to solve the hydraulic equations. To assess the model and the accuracy of the numerical technique used, a relatively simple problem, refilling of a dry horizontal tube with no heat transfer, is investigated. Experimental and calculated results are compared. This problem highlights the hydraulic aspects of the more complicated refilling and rewetting problem which is analyzed in a subsequent paper (Chan and Banerjee [2]).

A Two-Fluid Model of Mixing in a Two-Dimensional Enclosure

1998 ◽  
Vol 120 (1) ◽  
pp. 115-126 ◽  
Author(s):  
O. J. Ilegbusi ◽  
M. D. Mat
Keyword(s):  
Potential Energy ◽  
Buoyancy Force ◽  
Volume Fraction ◽  
Fluid Model ◽  
Two Dimensional ◽  
Material Interface ◽  
Thermal Buoyancy ◽  
Two Fluid Model ◽  
Nonisothermal Conditions ◽  
Two Fluid

Mixing of fluids in a cavity under isothermal and nonisothermal conditions is studied with a two-fluid model. This model involves the solution of separate transport equations for zone-averaged variables of each fluid with allowance for interface transport of momentum and energy. The effects of thermal and potential energy driven convection as well as Prandtl number are investigated. The material interface is represented by the contour of the volume fraction separating the fluids. The effect of the buoyancy force due to the initial potential energy of the fluids is found to predominate over thermal buoyancy for comparable Grashof numbers.

Hamiltonian vortices and reconnection in a magnetized plasma

1998 ◽  
Vol 59 (4) ◽  
pp. 727-736 ◽  
Author(s):  
B. N. KUVSHINOV ◽  
V. P. LAKHIN ◽  
F. PEGORARO ◽  
T. J. SCHEP
Keyword(s):  
Magnetic Flux ◽  
Euler Equation ◽  
Fluid Model ◽  
Magnetized Plasma ◽  
Two Dimensional ◽  
Magnetic Islands ◽  
Electron Momentum ◽  
Lagrangian Form ◽  
Two Fluid Model ◽  
Two Fluid

Hamiltonian vortices and reconnection in magnetized plasmas are investigated analytically and numerically using a two-fluid model. The equations are written in the Lagrangian form of three fields that are advected with different velocities. This system can be considered as a generalization and extension of the two-dimensional Euler equation for an ordinary fluid. It is pointed out that these equations allow solutions in the form of singular current-vortex filaments, drift-Alfvén vortices and magnetic islands, and admit collisionless magnetic reconnection where magnetic flux is converted into electron momentum and ion vorticity.

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