Phase Distribution Characteristics of Bubbly Flow in Mini Pipes Under Normal and Microgravity Conditions

Hazuku, Tatsuya; Takamasa, Tomoji; Hibiki, Takashi

doi:10.1007/s12217-015-9412-6

Cited by 11 publications

(2 citation statements)

References 34 publications

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“…The interfacial characteristics were used to understand the interfacial transfer of mass, momentum, and energy and further provide the necessary parameters for the two-fluid model [50,51]. Several experimental results showed that the interfacial area concentration of bubbles was related to the gas-liquid flow rate [52,53] and was affected by the coalescence and rupture between bubbles and turbulent eddies [54]. However, the study of interfacial area concentration for oil-water two-phase was relatively less.…”

Section: Effect Of Interfacial Area Concentration On the Apparent Vis...mentioning

confidence: 99%

Oil-Water Two-Phase Flow with Three Different Crude Oils: Flow Structure, Droplet Size and Viscosity

Lv,

Chen,

et al. 2024

Energies

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The study focuses on the flow patterns and pressure drop characteristics of three crude oils and water in a horizontal pipe. The experimental results showed that the transformation boundary of the flow pattern and phase inversion water fraction were related to the flow parameters. Comparing the three oils, it was found that the viscosity and composition of the oil also significantly influence the flow performance, which can be explained by the adsorption properties of the asphaltenes at the oil-water interface. In particular, the droplet size in water-in-oil dispersion flow was observed and measured. It showed that the water droplet size decreased with the increase of oil viscosity, the decrease of water content, the drop of temperature, and the growth of mixing velocity, probably due to higher shear stress and lower frequency of collision and coalescence between droplets. The apparent viscosity of water-in-oil emulsions was calculated by the rheological model, and the qualitative relation between flow parameters and interfacial area concentration on apparent viscosity was obtained. Taking the influence of interfacial area concentration into consideration, a simple and accurate viscosity model was established based on dimensional analysis, which is of great significance for process design in gathering and transportation systems.

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Section: Effect Of Interfacial Area Concentration On the Apparent Vis...mentioning

confidence: 99%

Oil-Water Two-Phase Flow with Three Different Crude Oils: Flow Structure, Droplet Size and Viscosity

Lv,

Chen,

et al. 2024

Energies

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“…In this context, authors constructed the precise databases on the axial development of the void fraction and the interfacial area concentration of vertical upward and horizontal bubbly flows in mini pipes with pipe sizes of 0.55, 0.79, and 1.02 mm (Hazuku et al, 2010). The local two-phase flow parameters of vertical upward bubbly flows and bubbly flows under microgravity in 3.00, 5.00, and 9.00 mm diameter pipes were also compared through the previous experiments (Hazuku et al, 2012(Hazuku et al, , 2015(Hazuku et al, , 2016. The results showed significant differences between the flow characteristics in horizontal and vertical mini pipes as well as under microgravity.…”

Section: Introductionmentioning

confidence: 99%

Measurement of local two-phase flow parameters of downward bubbly flow in mini pipes

Hazuku

Ihara

Hibiki

2019

Exp. Comput. Multiph. Flow

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In order to extend a precise database on local two-phase flow parameters in mini pipes, experiments were conducted for adiabatic gas-liquid bubbly flows flowing down in vertical mini pipes with inner diameters of 1.03, 3.00, and 5.00 mm. A stereo image-processing was applied to observe the phase distribution characteristics in pipe cross-section. The local flow parameters including profiles of void fraction, Sauter mean bubble diameter, and interfacial area concentration in pipe cross-section were obtained at three axial locations in the test pipes with various flow conditions: superficial gas velocity of 0.00508-0.0834 m/s and superficial liquid velocity of 0.208-3.00 m/s. The axial developments of the local flow parameters were discussed in detail based on the obtained data and the visual observation. It was confirmed that the core peak distributions were formed at low liquid flow rate conditions in which the buoyancy force dominated while the wall peak distributions were formed at high liquid flow rate conditions in which the body acceleration due to the frictional pressure gradient dominated. The result indicated the existence of lift force pushing the bubbles towards the pipe wall even in vertical downward flows. The database obtained through the present experiment is expected to be useful in modeling the interfacial area transport terms, the validation of the existing lift force models as well as the benchmarking of various CFD simulation codes.

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Gas/Water and Heat Management of PEM-Based Fuel Cell and Electrolyzer Systems for Space Applications

Guo

et al. 2016

Microgravity Sci. Technol.

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Phase Distribution Characteristics of Bubbly Flow in Mini Pipes Under Normal and Microgravity Conditions

Cited by 11 publications

References 34 publications

Oil-Water Two-Phase Flow with Three Different Crude Oils: Flow Structure, Droplet Size and Viscosity

Oil-Water Two-Phase Flow with Three Different Crude Oils: Flow Structure, Droplet Size and Viscosity

Measurement of local two-phase flow parameters of downward bubbly flow in mini pipes

Gas/Water and Heat Management of PEM-Based Fuel Cell and Electrolyzer Systems for Space Applications

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