SIMULATION METHODS OF TWO-PHASE FLOW BASED ON A HYPERBOLIC TWO-FLUID MODEL

A simulation model for the direct contact condensation of steam in subcooled water is presented that allows determination of major parameters of the process, such as the jet penetration length. Entrainment of water by the steam jet is modeled based on the Kelvin–Helmholtz and Rayleigh–Taylor instability theories. Primary atomization due to acceleration of interfacial waves and secondary atomization due to aerodynamic forces account for the initial size of entrained droplets. The resulting steam-water two-phase flow is simulated based on a one-dimensional two-fluid model. An interfacial area transport equation is used to track changes of the interfacial area density due to droplet entrainment and steam condensation. Interfacial heat and mass transfer rates during condensation are calculated using the two-resistance model. The resulting two-phase flow equations constitute a system of ordinary differential equations, which is solved by means of the explicit Runge–Kutta–Fehlberg algorithm. The simulation results are in good qualitative agreement with published experimental data over a wide range of pool temperatures and mass flow rates.

Download Full-text

Onset of slugging criterion based on characteristics and stability analyses of transient one-dimensional two-phase flow equations of two-fluid model

International Communications in Heat and Mass Transfer ◽

10.1016/0735-1933(96)00032-2 ◽

1996 ◽

Vol 23 (4) ◽

pp. 473-484 ◽

Cited By ~ 4

Author(s):

Moon-Hyun Chun ◽

Chang-Kyung Sung

Keyword(s):

Two Phase Flow ◽

Fluid Model ◽

Phase Flow ◽

Two Phase ◽

One Dimensional ◽

Flow Equations ◽

Stability Analyses ◽

Two Fluid Model ◽

Two Fluid

Download Full-text

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

Numerical Heat Transfer Part A Applications ◽

10.1080/10407780490453891 ◽

2004 ◽

Vol 45 (10) ◽

pp. 1049-1066 ◽

Cited By ~ 6

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

Download Full-text

Closure relations effects on the prediction of the stratified two-phase flow stability via the two-fluid model

International Journal of Multiphase Flow ◽

10.1016/j.ijmultiphaseflow.2017.07.010 ◽

2017 ◽

Vol 97 ◽

pp. 78-93 ◽

Cited By ~ 5

Author(s):

R. Kushnir ◽

V. Segal ◽

A. Ullmann ◽

N. Brauner

Keyword(s):

Two Phase Flow ◽

Fluid Model ◽

Flow Stability ◽

Phase Flow ◽

Two Phase ◽

Closure Relations ◽

Two Fluid Model ◽

Two Fluid

Download Full-text

Development of a Transient Mechanistic Two-Phase Flow Model for Wellbores

SPE Journal ◽

10.2118/142224-pa ◽

2012 ◽

Vol 17 (03) ◽

pp. 942-955 ◽

Cited By ~ 11

Author(s):

Mahdy Shirdel ◽

Kamy Sepehrnoori

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Two Phase Flow ◽

Fluid Model ◽

Flow Regimes ◽

Phase Flow ◽

Two Phase ◽

Wall Shear ◽

Two Fluid Model ◽

Two Fluid

Summary A great deal of research has been focused on transient two-phase flow in wellbores. However, there is lack of a comprehensive two-fluid model in the literature. In this paper, we present an implementation of a pseudo-compositional, thermal, fully implicit, transient two-fluid model for two-phase flow in wellbores. In this model, we solve gas/liquid mass balance, gas/liquid momentum balance, and two-phase energy balance equations to obtain five primary variables: liquid velocity, gas velocity, pressure, holdup, and temperature. This simulator can be used as a stand-alone code or can be used in conjunction with a reservoir simulator to mimic wellbore/reservoir dynamic interactions. In our model, we consider stratified, bubbly, intermittent, and annular flow regimes using appropriate closure relations for interphase and wall-shear stress terms in the momentum equations. In our simulation, we found that the interphase and wall-shear stress terms for different flow regimes can significantly affect the model's results. In addition, the interphase momentum transfer terms mainly influence the holdup value. The outcome of this research leads to a more accurate simulation of multiphase flow in the wellbore and pipes, which can be applied to the surface facility design, well-performance optimization, and wellbore damage estimation.

Download Full-text