Bubble and liquid turbulence characteristics of bubbly flow in a large diameter vertical pipe

Shawkat, M.E.; Ching, C.Y.; Shoukri, M.

doi:10.1016/j.ijmultiphaseflow.2008.01.007

Cited by 106 publications

(85 citation statements)

References 33 publications

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“…The wall vapor condensation rate can be modeled by considering the bubbles' coalescence and breakup and the turbulence effects [35,36], but because of the smallness of the hydraulic diameter and for the sake of simplicity, here it is assumed equal to:…”

Section: Conservation Of Mass: Continuity Equationmentioning

confidence: 99%

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Electromagnetohydrodynamic Effects on Steam Bubble Formation in Vertical Heated Upward Flow

et al. 2016

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Abstract:In this paper, the modeling of a steady state two phase flow heated through a vertical upward flow under electro-magneto-hydro-dynamic forces is presented. The thermal non-equilibrium, non-homogeneous, two-phase flow model consisting of mass, momentum and energy conservation in each phase has been adjusted for subcooled inlet conditions close to saturation. The P-1 approximation, viscous dissipation and Joule heating are included in the energy equations. It was seen that the Lorentz force can decrease and postpone the bubble generation, as well as affect the slip velocity, flow forces, viscous dissipation and Joule heating. Furthermore, two correlations for the slip velocity under magnetohydrodynamic (MHD) forces are presented. As shown, skin friction and Joule heating increase with the magnetic field strength.

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Section: Conservation Of Mass: Continuity Equationmentioning

confidence: 99%

“…However, in the present study, a more simplified force derived from [32][33][34][35][36][37][38][39] was used for the wall friction coefficient. The interfacial drag force (between phases) is [40]:…”

Section: Conservation Of Momentummentioning

confidence: 99%

Electromagnetohydrodynamic Effects on Steam Bubble Formation in Vertical Heated Upward Flow

et al. 2016

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“…A research group at McMaster University, Canada (Shawkat and coworkers) 59) also carried out experimental research on the flow structure of two-phase flow in a largediameter pipe. They used an X-type hot-film anemometer and measured the radial distributions of void fraction, bubble diameter (Sauter mean diameter), and averaged and turbulent velocities of liquid phase in flow and radial directions.…”

Section: Measurement Of Interfacial Area Concentration In Nonboiling mentioning

confidence: 99%

Development of Research on Interfacial Area Transport

Kataoka

2010

Journal of Nuclear Science and Technology

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Interfacial area concentration and its transport model are quite important in two-fluid model analysis of gas-liquid two-phase flow, which is widely used for the thermal hydraulic analysis of nuclear reactors. Recent developments and the present status of research on interfacial area transport model were reviewed. The definition and rigorous formulation of interfacial area concentration were introduced. Based on this rigorous formulation, basic transport equations of interfacial area concentration were developed by several research groups. In the interfacial area transport equation, source and sink terms of interfacial area concentration are important, and detailed analyses of these terms were carried out, and constitutive equations based on bubble coalescence, bubble breakup, phase change, bubble expansion, and shrinkage due to pressure change were developed. These interfacial area transport equations and constitutive equations were installed in two-fluid model codes and the validities of these models were confirmed by experimental data. Experimental research studies on interfacial area concentration and its transport were also reviewed. Measurement methods of interfacial area concentration were reviewed and multiple-sensor probe methods were established and commonly used in experimental research. Considerable experimental works have been carried out for air-water two-phase flows, and detailed measurements of distributions on interfacial area concentration and their development in the flow direction were reported. For boiling twophase flow, experimental works on interfacial area concentration and its transport have been carried out and data are being accumulated. These data are used for the validation of interfacial area transport models.

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“…predictions to the TBF in the large diameter circular (pipe diameter larger than 100 mm) and noncircular pipes, several researchers have also investigated the characteristics of the upward TBF in large circular [7,8] and small noncircular ducts [11] to establish the experimental database. For the large diameter pipes' cases, one of the main differences observed from those in small circular ducts is that the bubbles tend to migrate toward the pipe center which leads to lower wall peak of the void fraction under the same flow conditions and then earlier phase transition to the core peak.…”

Section: Introductionmentioning

confidence: 99%