Numerical simulation of two-phase gas–liquid flow through gradual expansions/contractions

Ahmadpour, Ali; Abadi, S.M.A. Noori Rahim; Kouhikamali, R.

doi:10.1016/j.ijmultiphaseflow.2015.10.008

Cited by 29 publications

(14 citation statements)

References 27 publications

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“…The strength of the shock waves was pronounced at low gas volume fraction but weakened with the increase of the void fraction. The bubbly flow through convergent/ divergent channels was investigated in details by Ahmadpour et al (2016) with Computational Fluid Dynamic (CFD) method. When the gas-liquid mixture flowed through the convergent/divergent section, a drastic increase in drag and virtual mass forces were obtained, especially higher drag force for the divergent section.…”

Section: Theoretical Analysis and Numerical Simulationmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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Venturi-type bubble generators own advantages of simplicity in structure, high efficiency, low power consumption, and high reliability, exhibiting a broad application potential in various fields. This work presents a literature review of recent progress in the research concerning Venturi-type bubble generators, with a focus on the performance evaluation, bubble transportation, and breakup mechanisms. Experimental studies employing flow visualization techniques have played an important role in exploring the bubble transportation and breakup phenomena, which is vitally necessary for clarifying the bubble breakup mechanisms and understanding the working principle and performance of a Venturi channel as a bubble generator. A summarization was carried out on both experimental and theoretical work concerning parameters influencing the bubble breakup and the performance of Venturi-type bubble generators. Based on the geometric parameter optimization combined with appropriate flow conditions, it is expected that Venturi-type bubble generators can produce bubbles with controllable size and concentration to satisfy the application requirements, while a further work is required to illustrate the interaction between the liquid and gas bubbles.

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Section: Theoretical Analysis and Numerical Simulationmentioning

confidence: 99%

A review on bubble generation and transportation in Venturi-type bubble generators

Huang

Sun

Liu

et al. 2019

Exp. Comput. Multiph. Flow

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“…The inter-phase momentum transfer term (Su,i) at the liquid-vapour interface accounts for the forces due to viscose drag (Fi,Drag), lift (Fi,lift), virtual mass (Fi,vm), turbulent dispersion (Fi,Dispersion) and wall lubrication force (Fq,wall) [39,40]:…”

Section: Governing Equationsmentioning

confidence: 99%

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Abadi

Meyer

2018

International Journal of Heat and Mass Transfer

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In this study, the effect of the tube inclination angle on simultaneous condensation inside and pool boiling outside a smooth tube is investigated numerically. Such conjugate phase-change phenomena happen in many heat exchangers, particularly in passive heat removal systems. The simulated domain is a pool filled with water liquid at atmospheric pressure, with a submerged tube with inner and outer diameters of 19 mm and 25 mm respectively. The fluid inside the tube is considered to be the steam at the saturation temperature of 250 °C, which is a very common operating condition in many heat removal systems. The flow field is considered to be turbulent, unsteady and three dimensional. The effect of conduction through the tube thickness is also taken into account. The Eulerian-Eulerian multiphase flow approach is utilized to express the governing equation of the problem. ANSYS FLUENT 17.1 is also used to solve the governing equations. The effects of various parameters, such as tube orientation, steam mass flux and inlet steam quality on the condensation and pool boiling heat transfer coefficients, are investigated. The results show good agreement with the available experimental data. The condensation heat transfer coefficient is found to increase with an increase in the inlet steam quality and steam mass flow rate. The results of the effect of inclination on the heat transfer coefficient are also compatible with the previous experimental works. Moreover, the results show that there is a partial maximum point for the total heat transfer coefficient at an inclination angle between θ = -60° and θ = -30°.

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“…It can be seen that the values fluctuate after the mesh number exceeds 6.0 × 10 5 , which can be consequently recognized as the appropriate mesh number. The numerical method in this paper is testified by simulating a gas-liquid flow process in the literature [20], as shown in Figure 5. The figure describes the axial pressure distribution at different The numerical method in this paper is testified by simulating a gas-liquid flow process in the literature [20], as shown in Figure 5.…”

Section: Independence Verificationmentioning

confidence: 99%

“…The numerical method in this paper is testified by simulating a gas-liquid flow process in the literature [20], as shown in Figure 5. The figure describes the axial pressure distribution at different The numerical method in this paper is testified by simulating a gas-liquid flow process in the literature [20], as shown in Figure 5. The figure describes the axial pressure distribution at different Reynolds numbers, and the simulated results acquired by the present method are in good agreement with the experiments, with the maximum error of less than 10%.…”

Section: Independence Verificationmentioning

confidence: 99%

Numerical Study of the Gas-Liquid Two-Phase Flow in a Self-Designed Mixer for a Ga-R113 MHD System

Zheng

Fang

et al. 2017

Energies

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Abstract:Liquid metal MHD (Magneto-Hydro-Dynamic) systems can be employed to produce electricity from a wide range of heat resources. In such a system, a low-boiling organic fluid and a high-temperature liquid metal fluid mix. The former evaporates, and carries the latter to flow through an MHD channel, where the electricity is generated. The mixing process and the gas-liquid flow characteristics will have a significant effect on the power generating efficiency. In the present work, trifluorotrichloroethane (R113) was chosen as the organic fluid, and gallium (Ga) as the liquid metal, respectively. Numerical study was subsequently carried out on the gas-liquid flow and heat transfer in a self-designed spherical mixer. The effects of the main factors, including the inlet velocities and inlet temperatures of Ga and R113, were separately determined, with suggested values or ranges discussed in detail.

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Numerical simulation of two-phase gas–liquid flow through gradual expansions/contractions

Cited by 29 publications

References 27 publications

A review on bubble generation and transportation in Venturi-type bubble generators

A review on bubble generation and transportation in Venturi-type bubble generators

Numerical investigation into the inclination effect on conjugate pool boiling and the condensation of steam in a passive heat removal system

Numerical Study of the Gas-Liquid Two-Phase Flow in a Self-Designed Mixer for a Ga-R113 MHD System

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