Analysis of phase distribution in fully developed laminar bubbly two-phase flow

Antal, Steven P.; Lahey, R.T.; Flaherty, Joseph E.

doi:10.1016/0301-9322(91)90029-3

Cited by 758 publications

(329 citation statements)

References 6 publications

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“…The studies done in bubbly vertical downward flow by Drew and Lahey [6], Wang et al [7] Antal et al [8] and Kashinsky and Randin [5] reported similar void fraction distributions as measured in the current study with a quasi-constant void fraction in the core region which drops abruptly to zero as the wall is approached. Iskandrani and Kojasoy [9] also reported that, in twophase vertical bubbly flows, the presence of voids tends to flatten the liquid velocity profile, thus leading to a homogenous phase distribution across the vertical pipe section.…”

Section: Resultssupporting

confidence: 85%

“…Furthermore, Antal et al [8] related the void fraction distribution across the vertical pipe section with a wall repulsion force dependent on the bubble radius, distance from the wall and the phase relative velocity. Such a repulsion force is assumed to be equal for both down and upward flows.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, negligble consideration has been given to the downward flow scenario. However, the known studies done in bubbly vertical downward flow by Drew and Lahey [6], Wang et al [7] Antal et al [8] and Kashinsky and Randin [5] reported similar void fraction dis tributions with a quasiconstant void fraction in the core region which drops abruptly to zero as the wall is approached.…”

Section: Introductionmentioning

confidence: 85%

See 2 more Smart Citations

Two-phase distribution in the vertical flow line of a domestic wet central heating system

Fsadni

2013

EPJ Web of Conferences

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Abstract. The theoretical and experimental aspects of bubble distribution in bubbly two-phase flow are reviewed in the context of the micro bubbles present in a domestic gas fired wet central heating system. The latter systems are mostly operated through the circulation of heated standard tap water through a closed loop circuit which often results in water supersaturated with dissolved air. This leads to micro bubble nucleation at the primary heat exchanger wall, followed by detachment along the flow. Consequently, a bubbly two-phase flow characterises the flow line of such systems. The two-phase distribution across the vertical and horizontal pipes was measured through a consideration of the volumetric void fraction, quantified through photographic techniques. The bubble distribution in the vertical pipe in down flow conditions was measured to be quasi homogenous across the pipe section with a negligible reduction in t he void fraction at close proximity to the pipe wall. Such a reduction was more evident at lower bulk fluid velocities.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 85%

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Two-phase distribution in the vertical flow line of a domestic wet central heating system

Fsadni

2013

EPJ Web of Conferences

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“…It is mainly determined by the lift and wall forces. Antal et al [14] proposed a wall lubrication force as follows: …”

Section: Wall Lubrication Force Modelmentioning

confidence: 99%

Verification of Turbulence and Non-Drag Interfacial Force Models of a Computational Multi-Fluid Dynamics Code

Park¹,

Chun²

2013

Journal of computational fluids engineering

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“…The lift force is given by where CD is the lift force coefficient given by the Tomiyama correlation [23]. The wall lubrication [24] and turbulent dispersion [25] forces are also implemented to consider the lateral motion of gas in liquid. The virtual mass force is expressed as where For the interfacial heat transfer coefficients in Eqs.…”

Section: Physical Modelsmentioning

confidence: 99%