Axial void fraction profile in low pressure subcooled flow boiling

Zeitoun, O.; Shoukri, M.

doi:10.1016/0017-9310(96)00164-0

Cited by 135 publications

(26 citation statements)

References 19 publications

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“…The bubble departure diameter of the dispersed phase played a key role in the two-phase flow and heat transfer process and has a close relationship with the surface subcooling. Previously, the relationship between the surface subcooling and the bubble departure diameter was obtained from the experimental data [39][40][41][42] and empirical formula [43]. In this study, it can be seen from the numerical calculation that bubble departure diameter increased as surface subcooling increased.…”

Section: Characteristics Analysis Of Evaporation and Condensationmentioning

confidence: 69%

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

Hong-jie¹,

Zhang²,

Li³

et al. 2016

IJHT

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The heat pipe receiver with integrated high temperature latent thermal energy storage is one of the key components of Solar Dynamic Space Power System (SDPSS), among which the evaporation and condensation is the main heat transfer mode, a very complicated two-phase flow. However, research on the two-phase flow and heat transfer characteristics is an effective way to improve the system efficiency and reduce the system mass. So a two-dimensional physical model was built and the volume of fluid (VOF) technique was used to model the interaction between the two phases. The UDF (Users Define Function) was introduced to handle the mass source terms. In the study, the relationship between superheat, subcooling and wall heat flux were investigated. In addition, the flow pattern of bubbles in the tube was analyzed. Compared with the churn bubbles flow, the heat transfer coefficient of the bubbles flow was much higher. Bubble departure diameter increased as surface subcooling increased. The work in this paper lays a good foundation for the further research on the heat transfer characteristics of heat pipe receiver with integrated high temperature latent thermal energy storage.

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Section: Characteristics Analysis Of Evaporation and Condensationmentioning

confidence: 69%

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

Hong-jie¹,

Zhang²,

Li³

et al. 2016

IJHT

View full text Add to dashboard Cite

show abstract

“…As stated in the problem definition, steady state one-dimensional case experiment results performed on the geometry of the vertical concentric annular tube (Figure 1) by Shoukri [29] where sub-cooled water is entering upward were compared to the results of the numerical calculations of the model presented here. This experiment simulated a low pressurized tube with water that was heated at the middle section of the tube.…”

Section: Resultsmentioning

confidence: 99%

“…The void fraction prediction is the most important characteristic of a low pressure boiling problem. For example, all of the numerical predictions of the [29] are about the void fractions. Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1 shows the sectional view of the vertical tube and its boundary condition. This problem is the same as the Case 3 experiment from [29], where the vertical concentric annular is a part of the low pressure water boiling loop. The fluid entered the channel with a mass flux of 283.1 kg/m 2 ·s and 19.7 • C sub-cooling.…”

Section: Problem Definitionmentioning

confidence: 99%

“…When the length of the pipe is much larger than the diameter, the one-dimensional method to analyze the fluid flow leads to acceptable results [29]. The general case of the mathematical formulation of the proposed model involves 14 unknowns: seven variables of the flow (pressure, velocity, temperature of each phase and the void fraction), three interfacial transfer terms (mass, momentum and energy) and four transfer terms at the wall assumed impermeable (transfer of the momentum and the energy of each phase at the wall).…”

Section: Mathematical Modelmentioning

confidence: 99%

See 2 more Smart Citations

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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Numerical Investigation of Flow Instability in a Low-Pressure Subcooled Boiling Channel

Yeoh

2003

Computational Fluid Dynamics 2002

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Axial void fraction profile in low pressure subcooled flow boiling

Cited by 135 publications

References 19 publications

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

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

Electromagnetohydrodynamic Effects on Steam Bubble Formation in Vertical Heated Upward Flow

Numerical Investigation of Flow Instability in a Low-Pressure Subcooled Boiling Channel

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