Pressure distribution and vortical structure in the wake behind gas bubbles in liquid and liquid-solid systems

Raghunathan, K.; Kumar, Samir; Fan, Liang‐Shih

doi:10.1016/0301-9322(92)90005-2

Cited by 9 publications

(6 citation statements)

References 4 publications

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“…Additional information on the disturbance of the vortices to the pressure and velocity can be seen when x = 0.038 mm. The minimum pressure can also appear in the vortex centres, which resemble the experimental observations of Raghunathan et al 29 It is accompanied by the velocity change from positive values to negative ones. Further downstream, there are small peaks in the pressure curve affected by the vortices.…”

Section: Pressure Field and Velocity Fieldsupporting

confidence: 84%

“…For the pressure field, Lazarek and Littman 14 measured the pressure field around a large two-dimensional spherical-cap bubble in water. Later Bessler and Littman 15 extended this study for liquids of different viscosities and Raghunathan et al 29 further extended to a liquid-solid system. In all these studies, only spherical-cap bubbles were observed.…”

Section: Pressure Field and Velocity Fieldmentioning

confidence: 99%

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Volume-of-fluid simulations of bubble dynamics in a vertical Hele-Shaw cell

et al. 2016

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Bubbles in confined geometries serve an important role for industrial operations involving bubble-liquid interactions. However, high Reynolds number bubble dynamics in confined flows are still not well understood due to experimental challenges. In the present paper, combined experimental and numerical methods are used to provide a comprehensive insight into these dynamics. The bubble behaviour in a vertical Hele-Shaw cell is investigated experimentally with a fully wetting liquid for a variety of gap thicknesses. A numerical model is developed using the volume of fluid method coupled with a continuum surface force model and a wall friction model. The developed model successfully simulates the dynamics of a bubble under the present experimental conditions and shows good agreement between experimental and simulation results. It is found that with an increased spacing between the cell walls, the bubble shape changes from oblate ellipsoid and spherical-cap to more complicated shapes, while the bubble path changes from only rectilinear to a combination of oscillating and rectilinear; the bubble drag coefficient decreases and this results in a higher bubble velocity caused by a lower pressure exerted on the bubble; the wake boundary and wake length evolve gradually accompanied by vortex formation and shedding.

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Section: Pressure Field and Velocity Fieldsupporting

confidence: 84%

Section: Pressure Field and Velocity Fieldmentioning

confidence: 99%

Volume-of-fluid simulations of bubble dynamics in a vertical Hele-Shaw cell

et al. 2016

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“…Heterogenous effects caused by the larger particle size reduce the bubblewake-induced enhancement in heat transfer although the baseline value is increased. Note that for the liquid-solid system containing GB326, heterogenous effects caused by the particle in the system destroy ordered motion/circulation resulting in reduced vortical strength compared with that in water and liquid-solid systems containing GB163 (Raghunathan et al, 1992). The baseline values (time-averaged heat-transfer coefficient with no bubble injection) for liquid is 285 W/m2*K, for GB163 system is 808 W/m2*K, and for GB326 system is 815 W/mZ*K. Figure 10 shows the in-situ visualization of local solids motion in the vicinity of the probe due to the passage of single gas bubble in the liquid-solid fluidized bed containing GB163.…”

Section: Instantaneous Heat-transfer Coefficientmentioning

confidence: 99%

“…They reported that the enhancement of mass-transfer coefficient takes place in the wake. Raghunathan et al (1992) studied the pressure distribution and vortical structure in the wake behind single gas bubbles in stagnant water and 163-pm and 326-pm glass-beads fluidized bed. They reported significant effect of solids on primary wake flow behavior.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of heat transfer in bubbly liquid and liquid‐solid systems: Single bubble injection

et al. 1992

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“…e gas holdup significantly affects the efficiencies of mass transfer, heat transfer, and microrate of reaction. e gas holdup distribution is mainly related to the superficial gas velocity, solids' concentration, pressure distribution, density of each phase, and the physical properties of the liquid [22].…”

Section: Introductionmentioning

confidence: 99%

Dimensional Analysis of Gas Holdup of Venturi Carbonation Reactor for Red Mud Processing

Xiao

Liu

Zhao

et al. 2020

Mathematical Problems in Engineering

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Gas holdup is an important parameter in the carbonation reaction for processing red mud. In this paper, for estimating the gas holdup of Venturi carbonation reactor, water model experiments were performed. The effects of superficial gas velocities, superficial liquid velocities, and liquid-to-solid and height-to-diameter ratio on the gas holdup are investigated. Through dimensional analysis using Buckingham π principle, a derivation of the empirical correlation is also proposed. The results indicate that gas holdup increases with the increase in gas velocity, with the decrease in liquid velocity, with the increase in liquid-to-solid ratio, and with the increase in height-to-diameter ratio. The calculated results from the empirical correlation agree well with the experimental data, which is important for designing a highly efficient Venturi reactor with a high temperature, high pressure, and three phases of gas, liquid, and solid.

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Pressure distribution and vortical structure in the wake behind gas bubbles in liquid and liquid-solid systems

Cited by 9 publications

References 4 publications

Volume-of-fluid simulations of bubble dynamics in a vertical Hele-Shaw cell

Volume-of-fluid simulations of bubble dynamics in a vertical Hele-Shaw cell

Mechanism of heat transfer in bubbly liquid and liquid‐solid systems: Single bubble injection

Dimensional Analysis of Gas Holdup of Venturi Carbonation Reactor for Red Mud Processing

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