Simulation of Flow Transients in a Water Filling Pipe Containing Entrapped Air Pocket with VOF Model

Zhou, Ling; Liu, Deyou; Ou, Chuanqi

doi:10.1080/19942060.2011.11015357

Cited by 68 publications

(60 citation statements)

References 13 publications

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“…Besides experimental research, numerical simulations have proven alternative means to investigate the fluid related phenomena, demonstrating significant advantages over experimental studies. Zhou et al (2011) investigated experimentally and numerically the pressure within an entrapped air pocket in a filling pipeline without air release. The VOF model was introduced to simulate the transient flow and showed similar flow properties to experimental observations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Mobilization of Oil Slugs in Capillary Model with Level set Approach

Dai

Wang

2014

Engineering Applications of Computational Fluid Mechanics

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Numerical investigation on mobilizing oil slugs trapped in an axisymmetric capillary tube saturated with water was conducted. The governing equations for the incompressible two-phase core-annular flow in a capillary model were derived. Numerical solutions for capturing the evolution of interface between oil and water were developed using a level set approach. A projection method was applied to obtain the velocity field of the twophase flow. The existence of a water film between the oil slug and solid tube wall was evident in mobilizing the oil slug, and the water film clearly reduced the external pressure required to mobilize the oil slug. This result matches with the experimental phenomena reported in the literature. New phenomena in oil slug mobilization and motion were also found in the numerical investigations. The results obtained showed the high efficiency of the presented approach and the significance of water film in improving the mobilization of oil slugs.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on Mobilization of Oil Slugs in Capillary Model with Level set Approach

Dai

Wang

2014

Engineering Applications of Computational Fluid Mechanics

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“…The volume of fluid (VOF) method is widely adopted to track the free-surface movement (Chokri, Zouhaier, Mohamed, & Khlifa, 2010;Zhou, Liu, & Ou, 2011), and it is also applied in the present numerical strategy. The governing equations are discretized by the finite volume method.…”

Section: Methodsmentioning

confidence: 99%

The effect of aspect ratio and axial magnetic field on thermocapillary convection in liquid bridges with a deformable free-surface

Zhang

Huang

Zhang

et al. 2015

Engineering Applications of Computational Fluid Mechanics

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Three-dimensional numerical simulations are performed to analyze the effect of the aspect ratio Ar and axial magnetic field on thermocapillary convection in liquid bridges with deformable freesurface under microgravity, in which the volume of fluid (VOF) method is adopted to track the free-surface movement. The simulation results elucidate that the oscillation wave number m and frequency of temperature fluctuation decrease with increasing Ar, while the amplitude of temperature fluctuation increases with increasing Ar. The deformation ratio ξ of the free-surface increases as Ar increases. The numerical results also reveal that the axial magnetic field causes a concentration of convection vortexes near the free-surface and effectively suppresses the flow in both the radial and axial directions. Moreover, the axial magnetic field effectively damps free-surface deformation, so that the deformation ratio ξ decreases as the Hartmann number Ha increases. The temperature displays a uniform and linear distribution along the free-surface and the axis of molten zone when B a = 0.3 T. ARTICLE HISTORYintensity of the applied axial magmatic fields (T) Ca Capillary number, Ca =

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“…The rigid model was used in order to compute the evolution of the water column [11,25], considering that the elasticity of the air is much higher than the elasticity of the pipe and the water [12]. Applying the rigid model to the emptying column j and considering that the drain valve s joins pipes L j and L j−1 , which is a common point in a pipeline, then:…”

Section: Equations For the Water Phasementioning

confidence: 99%

“…This problem can be studied using one (1D) [10,11], two (2D) [12] or three-dimensional (3D) [13] models. The water phase in the 1D model can be analyzed considering two types of models [14]: (i) elastic models [15,16], which consider the elasticity of the pipe and the water; or (ii) rigid models [17], which ignore the elasticity of them.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of a Water Emptying Pipeline Using Different Air Valves

Coronado-Hernández

Fuertes-Miquel

Besharat

et al. 2017

Water

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Abstract:The emptying procedure is a common operation that engineers have to face in pipelines. This generates subatmospheric pressure caused by the expansion of air pockets, which can produce the collapse of the system depending on the conditions of the installation. To avoid this problem, engineers have to install air valves in pipelines. However, if air valves are not adequately designed, then the risk in pipelines continues. In this research, a mathematical model is developed to simulate an emptying process in pipelines that can be used for planning this type of operation. The one-dimensional proposed model analyzes the water phase propagation by a new rigid model and the air pockets effect using thermodynamic formulations. The proposed model is validated through measurements of the air pocket absolute pressure, the water velocity and the length of the emptying columns in an experimental facility. Results show that the proposed model can accurately predict the hydraulic characteristic variables.

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Simulation of Flow Transients in a Water Filling Pipe Containing Entrapped Air Pocket with VOF Model

Cited by 68 publications

References 13 publications

Numerical Study on Mobilization of Oil Slugs in Capillary Model with Level set Approach

Numerical Study on Mobilization of Oil Slugs in Capillary Model with Level set Approach

The effect of aspect ratio and axial magnetic field on thermocapillary convection in liquid bridges with a deformable free-surface

Experimental and Numerical Analysis of a Water Emptying Pipeline Using Different Air Valves

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