Grouting Mechanism in Water-Bearing Fractured Rock Based on Two-Phase Flow

Grouting is always used in mine water plugging, reinforcement, and other disaster prevention projects. The diffusion mechanism of slurry in fractured rock is affected by geological environment and slurry performance, which should be revealed and characterized better. Based on the two-phase flow diffusion theory, a slurry diffusion model considering flowing water condition was established for a blocking area of a fracture zone in one case from China. The feasibility of two-phase flow model in grouting diffusion calculation was analyzed. The diffusion model in dynamic water environment was studied, and the diffusion range varying with time in the grouting area of Zhangji Coal Mine was explored. The optimization method of multi grouting holes was put forward, and the influence of water flowing was discussed. The results show that the slurry diffusion calculated by the two-phase flow model was feasible and consistent with the experimental study. The dynamic water can change the conventional circular diffusion state of slurry, but its pattern was oval and leaf type. There were different penetration distances in directions, and typical grouting voids were made on the side and upstream. When the single-hole grouting was carried out, the predetermined value can be achieved in the height range, but it was only about 15 m on the side because of the water flowing, which cannot meet the requirements. The optimization scheme of grouting was put forward, which adopted multiple grouting holes in the long side, and grouting in different directions and periods to avoid the possible problems of multihole intersection. The rationality and effectiveness of the proposed optimization method were verified through the calculation of water yield and analysis of cement composition from the drilling core in the grouted zone. In the grouting process, the water flowing has double effects, which has a significant role in promoting and scouring along the flow direction, but there is a significant weakness in the side diffusion. It is very important to realize the rational use of the dynamic water through the optimization scheme. This study is an important basic work of grouting mechanism, and it is expected to promote the development of grouting technology and application of two-phase fluid-solid coupling theory.

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Comprehensive Comparisons of a Two-Phase Flow Model with a Wide Range of Conditions

Coastal Dynamics 2005 ◽

10.1061/40855(214)91 ◽

2006 ◽

Author(s):

Haijiang Liu ◽

Shinji Sato

Keyword(s):

Flow Model ◽

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Wide Range

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A ONE-DIMENSIONAL TWO-PHASE FLOW MODEL AND EXPERIMENTAL VALIDATION FOR A FLASHING VISCOUS LIQUID IN A SPLASH PLATE NOZZLE

Atomization and Sprays ◽

10.1615/atomizspr.2015011460 ◽

2015 ◽

Vol 25 (9) ◽

pp. 795-817 ◽

Cited By ~ 1

Author(s):

Mika P. Jarvinen ◽

A. E. P. Kankkunen ◽

R. Virtanen ◽

P. H. Miikkulainen ◽

V. P. Heikkila

Keyword(s):

Viscous Liquid ◽

Experimental Validation ◽

Flow Model ◽

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

One Dimensional

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Status of Advanced Two-Phase Flow Model Development for SRM Chamber Flow Field and Combustion Modeling

10.21236/ada427829 ◽

2004 ◽

Author(s):

Gary Luke ◽

Mark Eagar ◽

Michael Sears ◽

Scott Felt ◽

Bob Prozan

Keyword(s):

Flow Field ◽

Flow Model ◽

Two Phase Flow ◽

Model Development ◽

Phase Flow ◽

Two Phase ◽

Combustion Modeling

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Experimental Investigation and Prediction on Pressure Drop during Flow Boiling in Horizontal Microchannels

Micromachines ◽

10.3390/mi12050510 ◽

2021 ◽

Vol 12 (5) ◽

pp. 510

Author(s):

Yan Huang ◽

Bifen Shu ◽

Shengnan Zhou ◽

Qi Shi

Keyword(s):

Pressure Drop ◽

Flow Model ◽

Two Phase Flow ◽

Flow Boiling ◽

Separated Flow ◽

Heat Fluxes ◽

Phase Flow ◽

Vapor Quality ◽

Two Phase ◽

Gas Flux

In this paper, two-phase pressure drop data were obtained for boiling in horizontal rectangular microchannels with a hydraulic diameter of 0.55 mm for R-134a over mass velocities from 790 to 1122, heat fluxes from 0 to 31.08 kW/m2 and vapor qualities from 0 to 0.25. The experimental results show that the Chisholm parameter in the separated flow model relies heavily on the vapor quality, especially in the low vapor quality region (from 0 to 0.1), where the two-phase flow pattern is mainly bubbly and slug flow. Then, the measured pressure drop data are compared with those from six separated flow models. Based on the comparison result, the superficial gas flux is introduced in this paper to consider the comprehensive influence of mass velocity and vapor quality on two-phase flow pressure drop, and a new equation for the Chisholm parameter in the separated flow model is proposed as a function of the superficial gas flux . The mean absolute error (MAE ) of the new flow correlation is 16.82%, which is significantly lower than the other correlations. Moreover, the applicability of the new expression has been verified by the experimental data in other literatures.

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A prospective study of anti-vibration mechanism of microfluidic fuel cell via novel two-phase flow model

Energy ◽

10.1016/j.energy.2020.119543 ◽

2021 ◽

Vol 218 ◽

pp. 119543

Author(s):

Jingxian Chen ◽

Peihang Xu ◽

Jie Lu ◽

Tiancheng Ouyang ◽

Chunlan Mo

Keyword(s):

Fuel Cell ◽

Prospective Study ◽

Flow Model ◽

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Vibration Mechanism ◽

Microfluidic Fuel Cell ◽

A Prospective Study

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A relaxation scheme for a hyperbolic multiphase flow model

ESAIM Mathematical Modelling and Numerical Analysis ◽

10.1051/m2an/2019034 ◽

2019 ◽

Vol 53 (5) ◽

pp. 1763-1795 ◽

Cited By ~ 1

Author(s):

Khaled Saleh

Keyword(s):

Multiphase Flow ◽

Flow Model ◽

Two Phase Flow ◽

Equations Of State ◽

Energy Inequality ◽

Approximation Error ◽

Finite Volume Scheme ◽

Phase Flow ◽

Two Phase ◽

Relaxation Scheme

This article is the first of two in which we develop a relaxation finite volume scheme for the convective part of the multiphase flow models introduced in the series of papers (Hérard, C.R. Math. 354 (2016) 954–959; Hérard, Math. Comput. Modell. 45 (2007) 732–755; Boukili and Hérard, ESAIM: M2AN 53 (2019) 1031–1059). In the present article we focus on barotropic flows where in each phase the pressure is a given function of the density. The case of general equations of state will be the purpose of the second article. We show how it is possible to extend the relaxation scheme designed in Coquel et al. (ESAIM: M2AN 48 (2013) 165–206) for the barotropic Baer–Nunziato two phase flow model to the multiphase flow model with N – where N is arbitrarily large – phases. The obtained scheme inherits the main properties of the relaxation scheme designed for the Baer–Nunziato two phase flow model. It applies to general barotropic equations of state. It is able to cope with arbitrarily small values of the statistical phase fractions. The approximated phase fractions and phase densities are proven to remain positive and a fully discrete energy inequality is also proven under a classical CFL condition. For N = 3, the relaxation scheme is compared with Rusanov’s scheme, which is the only numerical scheme presently available for the three phase flow model (see Boukili and Hérard, ESAIM: M2AN 53 (2019) 1031–1059). For the same level of refinement, the relaxation scheme is shown to be much more accurate than Rusanov’s scheme, and for a given level of approximation error, the relaxation scheme is shown to perform much better in terms of computational cost than Rusanov’s scheme. Moreover, contrary to Rusanov’s scheme which develops strong oscillations when approximating vanishing phase solutions, the numerical results show that the relaxation scheme remains stable in such regimes.

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