A New Numerical Method of Simulating Two-dimensional Two-phase Flow Through Media With Single And Double Porosity

Mechanistic models have been developed for each of the existing two-phase flow patterns in an annulus, namely bubble flow, dispersed bubble flow, slug flow, and annular flow. These models are based on two-phase flow physical phenomena and incorporate annulus characteristics such as casing and tubing diameters and degree of eccentricity. The models also apply the new predictive means for friction factor and Taylor bubble rise velocity presented in Part I. Given a set of flow conditions, the existing flow pattern in the system can be predicted. The developed models are applied next for predicting the flow behavior, including the average volumetric liquid holdup and the average total pressure gradient for the existing flow pattern. In general, good agreement was observed between the experimental data and model predictions.

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Homogenization of nonisothermal immiscible incompressible two-phase flow in double porosity media

Nonlinear Analysis Real World Applications ◽

10.1016/j.nonrwa.2021.103323 ◽

2021 ◽

Vol 61 ◽

pp. 103323

Author(s):

B. Amaziane ◽

M. Jurak ◽

L. Pankratov ◽

A. Piatnitski

Keyword(s):

Two Phase Flow ◽

Double Porosity ◽

Phase Flow ◽

Two Phase

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Numerical Analysis of Two-Phase Pipe Flow of Liquid Helium Using Multi-Fluid Model

Journal of Fluids Engineering ◽

10.1115/1.1400747 ◽

2001 ◽

Vol 123 (4) ◽

pp. 811-818 ◽

Cited By ~ 6

Author(s):

Jun Ishimoto ◽

Mamoru Oike ◽

Kenjiro Kamijo

Keyword(s):

Phase Transition ◽

Gas Phase ◽

Liquid Helium ◽

Two Phase Flow ◽

Fluid Model ◽

Numerical Results ◽

Phase Flow ◽

Two Dimensional ◽

Two Phase ◽

Normal Fluid

The two-dimensional characteristics of the vapor-liquid two-phase flow of liquid helium in a pipe are numerically investigated to realize the further development and high performance of new cryogenic engineering applications. First, the governing equations of the two-phase flow of liquid helium based on the unsteady thermal nonequilibrium multi-fluid model are presented and several flow characteristics are numerically calculated, taking into account the effect of superfluidity. Based on the numerical results, the two-dimensional structure of the two-phase flow of liquid helium is shown in detail, and it is also found that the phase transition of the normal fluid to the superfluid and the generation of superfluid counterflow against normal fluid flow are conspicuous in the large gas phase volume fraction region where the liquid to gas phase change actively occurs. Furthermore, it is clarified that the mechanism of the He I to He II phase transition caused by the temperature decrease is due to the deprivation of latent heat for vaporization from the liquid phase. According to these theoretical results, the fundamental characteristics of the cryogenic two-phase flow are predicted. The numerical results obtained should contribute to the realization of advanced cryogenic industrial applications.

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