Simulation of the Vapor-Liquid Two-Phase Flow of Evaporation and Condensation

Hong-jie, Song; Zhang, Wei; Li, Yaqi; Yang, Zhengwei; Ming, Anbo

doi:10.18280/ijht.340416

Cited by 8 publications

(10 citation statements)

References 35 publications

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“…To measure the cross-sectional void fraction profile, the wire mesh sensor (WMS) (1) was used. It was located at the downstream side (based on the air flow direction) of the multiwave ultrasonic sensor (2).…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Void fraction that is also known as the gas hold-up or the volumetric concentration of the gas phase in gas-liquid twophase flows is a critically important parameter in the design and operation of the thermal hydraulic systems in, for example, various nuclear power reactor [1], solar dynamics space station -SDPSS [2], oil and gas gathering and transportation [3]. One of the reasons is that it directly and critically affects the flow regimes and hence the heat transfer characteristics and/or the efficiency of the systems [4].…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Measurement of Two-Phase Flow Parameters for Drift-Flux Model

Nguyen¹

2021

IJHT

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The drift-flux model is widely used in study, calculation and design of two-phase flow. It is a highly efficient model that requires little computation resources. In the model, accurate calculation of the distribution parameter C0 and the drift velocity Vgj is a critically important factor. The calculation requires simultaneously measured data of phase velocity and void fraction distributions or profiles. By using currently widely used methods for two-phase flow measurement, satisfying the requirement is highly difficult. This paper presents novel results of simultaneous measurement of the phase velocity and void fraction profiles in a vertical round tube of 50 mm inner diameter. A combination measurement method has been developed. It comprises the multiwave Ultrasonic Velocity Profile (multiwave UVP) method and the Wire Mesh Tomography (WMT). Based on the measured data, C0 and Vgj have been calculated. They have been compared with those of the published experimental data and correlations. Analyses of the measured data have been carried out. For the first time, the analysis results reveal the variation of C0 and Vgj in the measured flow conditions. More importantly, the data obtained are also useful for the development and validation of the computational codes for two-phase flow.

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Section: Experimental Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of Two-Phase Flow Parameters for Drift-Flux Model

Nguyen¹

2021

IJHT

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“…While, at the condenser wall, a constant temperature of 298 K was applied for all cases. Each wall was imposed with a non-slip boundary condition [21] [23]. At the general setup, gravitational acceleration of -9.81 m/s 2 was set at a positive y-axis direction.…”

Section: Boundary Conditionmentioning

confidence: 99%

Simulation of Thermosyphon Rankine Engine

Othman

Remeli

Azizi

2022

ARASET

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The increasing global energy demand has led to other alternative ways of harvesting energy from renewable resources. This energy cause less environmental pollution and deterioration of humans' health. Thermosyphon Rankine engine (TSR) is a concept used for direct electrical power generation from low-grade heat sources. In this project, an extended investigation on previous experimental done was conducted through a simulation approach using Computational Fluid Dynamic (CFD) analysis to simulate a two-phase flow, phase change occurred during evaporation and condensation processes inside the thermosyphon under different power inputs of 245 W, 552 W, and 984 W. Also the water was used as a working fluid. The volume of fluid (VOF) technique was used to model the phase change using ANSYS FLUENT software. The simulation investigated temperature profile, water volume fraction, and velocity. Then, CFD predicted temperature profile was compared with the previous experimental data, and percentage error was calculated. Compared to the experimental one, CFD predicted temperature profile was higher than the experimental one due to mechanical losses during experimentation. Meanwhile, the model managed to simulate vapor bubbles and nucleate boiling during phase change. It showed that the VOF model with the in-built evaporation-condensation model developed by Lee only simulated nucleate boiling at the interphase between water and vapor phase during evaporation and condensation processes.

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“…The surface tension effects and wall adhesion can be included in the VOF model [18]. The continuum surface force (CSF) model is used as the surface tension model in ANSYS Fluent and expressed as the pressure jump across the surface.…”

Section: Multiphase Modelmentioning

confidence: 99%

CFD simulation and experimental study of water-oil displacement flow in an inclined pipe

Jieheng¹,

Zhang²,

Jiang³

et al. 2017

IJHT

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This paper investigates the water-oil displacement flow in a downward inclined pipe, which is applied in practice in the chemical and oil industries. The computational fluid dynamics (CFD) method was applied in the simulation of the displacement process. The simulation procedure was performed in a structured grid with refinement near the boundary, and the Volume of Fluid method was used as the multiphase model. Three flow patterns were obtained and the simulated data were favorably matched with the experiment results. Further efforts were made where parametric studies were concerned, including the effects of pipe diameter, inclination angle, and water inlet velocity on the displacement process. It was concluded that the displacement efficiency can be improved by increasing the water inlet velocity, and the increasing pipe inclination angle may lead to the instability of the interface.

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Simulation of the Vapor-Liquid Two-Phase Flow of Evaporation and Condensation

Cited by 8 publications

References 35 publications

Simultaneous Measurement of Two-Phase Flow Parameters for Drift-Flux Model

Simultaneous Measurement of Two-Phase Flow Parameters for Drift-Flux Model

Simulation of Thermosyphon Rankine Engine

CFD simulation and experimental study of water-oil displacement flow in an inclined pipe

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