Steam-water void fraction for vertical upflow in a 73.9 mm pipe

Beattie, D. R. H.; Sugawara, Shinji

doi:10.1016/0301-9322(86)90065-0

Cited by 72 publications

(8 citation statements)

References 6 publications

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“…Based on this finding , Bonnecaze et al proposed a correlation for drift velocity (Eq. ), which was adapted by Beattie and Sugawara and Hibiki and Ishii .

true V_{normalgr} = 0.35 \sqrt{\frac{gD (ρ_{l} - ρ_{g})}{ρ_{normall}}}

…”

Section: Drift Flux Model and Proposed Correlationsmentioning

confidence: 99%

Improved Void Fraction Correlation for Two‐Phase Flow in Large‐Diameter Annuli

et al. 2017

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A flow pattern-independent void fraction correlation for gas-liquid two-phase flow in vertical large-diameter annuli is established. Two equations are proposed for the parameters of a drift flux model-based correlation: the distribution parameter and the drift flux velocity. These equations are expressed as a function of two-phase flow variables including void fraction, fluid properties, pipe geometry, and phase flow rates. Experiments were performed to study the void fraction of vertical air-water two-phase flow in large-diameter annuli. The obtained experimental data along with the literature data of Caetano are used to verify the performance of the proposed void fraction correlation. The accuracy of this correlation is compared with nineteen frequently used correlations in literature. The proposed correlation was found to predict the void fraction consistently with a better accuracy.

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“…Based on this finding , Bonnecaze et al proposed a correlation for drift velocity (Eq. ), which was adapted by Beattie and Sugawara and Hibiki and Ishii .

true V_{normalgr} = 0.35 \sqrt{\frac{gD (ρ_{l} - ρ_{g})}{ρ_{normall}}}

…”

Section: Drift Flux Model and Proposed Correlationsmentioning

confidence: 99%

Improved Void Fraction Correlation for Two‐Phase Flow in Large‐Diameter Annuli

et al. 2017

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“…The balance between the coalescence and breakage as well as the reduced static pressure at higher axial positions lead to create larger bubbles which tend to migrate toward the center of the column. Furthermore, the gas holdup profile is radially uniform at low gas velocities, implying a homogeneous regime, but it is almost Clark et al [54] Hibiki et al [55] Beattie et al [56] Modified distribution 1 8modified drift flux model, Equation 10Urseanu et al [33] Hikita et al [29] Joshi et al [7] Kawase et al [18] Dimentiev et al [34] Toshiba [35] Figure 9: Gas holdup prediction by using different models. parabolic at higher velocities, corresponding to transition and heterogeneous regimes.…”

Section: Gas Holdup and Flow Structurementioning

confidence: 99%

A Numerical Model for Bubble Column Reactors: Prediction of the Fractional Gas Holdup by the Implementation of the Drift-Flux Model

Bahramian¹,

Elyasi²

2019

J Chem Eng Process Technol

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Comprehensive knowledge of hydrodynamics inside a reactor is crucial for the design and scale-up of bubble columns. Fractional gas holdup (αg) is an important parameter that should be obtained for the design of bubble column reactors. The estimation of this parameter depends mainly on experimental procedures. Drift-flux theory is one of the most practical and accurate models for calculating the gas holdup. Although many researchers have studied bubble column reactors, because of the limits of the experimental setting, there are few studies that have operated over a wide range of superficial gas velocities. In this work, a transient 3-D numerical simulation of upward air-water flow in the bubble column was performed over a wide range of superficial gas velocities (0.025-0.4 m/s) using the Eulerian-Eulerian model. The effect of the superficial gas velocity on the flow pattern was simulated, and two-phase flow regimes were classified into homogeneous, transition and heterogeneous regimes. Considering the importance of the drift-flux model, the values of the distribution parameter and the drift velocity were computed according to their definitions using the cross-sectional gas holdup and velocity profiles obtained via computational flow dynamic simulation. The results were verified against the experimental data, and a correlation is proposed for predicting the gas holdup.

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“…Six correlations for distribution parameter and weighted mean drift velocity [11,[16][17][18][19][20][21] were evaluated to examine the applicability of those models to subcooled boiling flow. They are listed in Table 3 in which the applicable geometry of each correlation is also shown.…”

Section: Void Fractionmentioning

confidence: 99%

Axial developments of interfacial area and void concentration profiles in subcooled boiling flow of water

Lee

Situ

Hibiki

et al. 2009

International Journal of Heat and Mass Transfer

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a b s t r a c tAxial developments of the local void fraction, interfacial area concentration and bubble Sauter mean diameter were measured in subcooled boiling flow of water in a vertical internally heated annulus using the double-sensor conductivity probe technique. Measurements were performed under varying conditions of heat flux, inlet liquid velocity and inlet liquid temperature. A total of 10 data sets were acquired. Based on these measurements with the previous data obtained in the present test loop, the influence of flow condition on the profiles of local two-phase flow parameters was discussed. The measured average void fraction and interfacial area concentration were compared with the predictions by existing correlations for drift-flux parameters and interfacial area concentration. Also, the recently proposed bubble layer thickness model in subcooled boiling was evaluated for the measurement data.

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Steam-water void fraction for vertical upflow in a 73.9 mm pipe

Cited by 72 publications

References 6 publications

Improved Void Fraction Correlation for Two‐Phase Flow in Large‐Diameter Annuli

Improved Void Fraction Correlation for Two‐Phase Flow in Large‐Diameter Annuli

A Numerical Model for Bubble Column Reactors: Prediction of the Fractional Gas Holdup by the Implementation of the Drift-Flux Model

Axial developments of interfacial area and void concentration profiles in subcooled boiling flow of water

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