A novel drag force coefficient model for gas–water two-phase flows under different flow patterns

Shang, Zhi

doi:10.1016/j.nucengdes.2015.04.001

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…In this study, some of the recent developments in simulation methods are reviewed. Peña-Monferrer et al, Shang, and Wang used the Eulerian approach with a k –ε turbulence model. Islam et al also implemented the Eulerian approach with a low Re correction turbulence model.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulations of the Air–Water Two-Phase Vertically Upward Bubbly Flow in Pipes

Lote

Vinod

Patwardhan

2018

Ind. Eng. Chem. Res.

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In this study, computational fluid dynamics (CFD) simulation of air–water two-phase flow in vertical pipe has been carried out. Wide ranges of superficial liquid and gas velocities, 0.376–3.53 and 0.0036–1.275 m/s, and dispersed phase holdup range from 0.3 to 38.74% is used in the simulation. In this study, for drag, lift, wall lubrication, and turbulent dispersion force the models of Grace, Tomiyama, Hosokawa, and Burns are used, respectively. The Eulerian–Eulerian multiphase approach with the k–ω shear stress transport (SST) turbulence model was used. Bubble diameter is an essential parameter to perform the Eulerian simulation. In the present study, we developed new correlation for bubble diameter and with this predicted bubble diameter simulations were performed. The developed CFD model is well capable of predicting gas void fraction, interfacial area concentration, pressure drop, gas/liquid velocity, and turbulent kinetic energy.

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Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Simulations of the Air–Water Two-Phase Vertically Upward Bubbly Flow in Pipes

Lote

Vinod

Patwardhan

2018

Ind. Eng. Chem. Res.

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“…Interfacial area concentration is the interfacial area between two phases of per unit mixture volume. To calculated bubble collision, the interfacial area concentration is calculated in algebra by the Particle model which is derived from the surface area to volume ratio [3,25],…”

Section: Bubble Size Due To Collisionmentioning

confidence: 99%

“…Among these interphase forces, the drag force, → F drag , is the dominant component. The drag force per unit volume can be expressed as [25,30] …”

Section: Interphase Momentum Transfermentioning

confidence: 99%

An Overall Bubble Diameter Model for the Flow Boiling and Numerical Analysis through Global Information Searching

Zhang

Lin

et al. 2018

Energies

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Bubble diameter is important for the three-dimensional nucleate boiling two-phase flow simulation. However, the bubble diameter is rarely considered as a variable because it is difficult to estimate. In this paper, a novel bubble diameter model is proposed for the boiling flow. The heat transfer growth, the breakup or coalescence of collision and the liquid impacting separation are considered as the factors affecting the bubble diameter, and three bubble diameter sub-models are developed to calculate the overall bubble diameter based on a departure diameter. In the model, the heat transfer growth is calculated after estimating the bubble location. The collision variation is deduced from the interfacial area concentration equation. The liquid impacting variation is calculated through phase interaction force and gas viscous force. The proposed model is conducted through global information searching in the flow boiling simulation and validated using the void fraction and temperature data from the literature. The effects of the heat transfer growth, the collision, and the separating volume on the bubble diameter are discussed.

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“…Wachem & Almstedt (2003) conducted a review of the mathematical formulation for CFD models to predict the behavior of the fluid-fluid flow and solid-fluid flow. For the liquid-gas two-phase flow, researches mainly used the Eulerian model (Krishna, Urseanu, van Baten & Ellenberger, 1999;Ahmai & Al-Makky, 2014;Shang, 2015) or the Volume of Fluid (VOF) model which is an Eulerian approach (Anglart & Podowski, 2001;Fang, David, Rogacs & Goodson, 2010;Abdulkadir, 2011). Additionally, vertical flows have been analyzed using both CFD models (Abdulkadir, 2011;Shang, 2015).…”

Section: Introductionmentioning

confidence: 99%

Comparison between eulerian and vof models for two-phase flow assessment in vertical pipes

Guerrero¹,

Muñoz²,

Ratkovich³

2017

CT&F Cienc. Tecnol. Futuro

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he appropriate characterization of the two-phase flow has been recently considered as a topic of interest at industrial level. The Computational Fluid Dynamics (CFD) is one of the techniques used for this analysis. Commonly, the Volume Of Fluid (VOF) model and the Eulerian model are used to model the two-phase flow. The mathematical formulations of these models cause differences in their convergence, computational time and accuracy. This article describes the differences between these two models for applications in the two-phase upward-flow. In order to accomplish this objective, the CFD models were validated with experimental results. This study modeled six experiments with an orthogonal (butterfly) grid. As a result, the Eulerian model shows mean square errors (13.86%) lower than the VOF model (19.04%) for low void fraction flows (< 0.25). Furthermore, it was demonstrated that Eulerian model performance is independent from grid, spending less computational time than the VOF model. Finally, it was determined that only the VOF model predicts the pattern flow.

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A novel drag force coefficient model for gas–water two-phase flows under different flow patterns

Cited by 7 publications

References 41 publications

Computational Fluid Dynamics Simulations of the Air–Water Two-Phase Vertically Upward Bubbly Flow in Pipes

Computational Fluid Dynamics Simulations of the Air–Water Two-Phase Vertically Upward Bubbly Flow in Pipes

An Overall Bubble Diameter Model for the Flow Boiling and Numerical Analysis through Global Information Searching

Comparison between eulerian and vof models for two-phase flow assessment in vertical pipes

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