Conditions for the sliding-bouncing transition for the interaction of a bubble with an inclined wall

Barbosa, C. F. Gomez; Legendre, Dominique; Zenit, Roberto

doi:10.1103/physrevfluids.1.032201

Cited by 11 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For bubbles rising in the column subjected to roll motion with an amplitude of 15°from vertical, F Bn continuously changes based on the sinusoidal trajectory according to the hexapod trajectory. The bubbles bounce beneath the columns' wall while rising, which could be predicted by the criteria proposed by Barbosa et al 22 for the sliding/bouncing regimes of single bubbles along the inclined walls. The bouncing regime is maintained for the maximum angle of the column in this study, which is 15°from vertical, sustaining the dispersed bubble flow regime despite the high local voids beneath the upper wall.…”

Section: Resultsmentioning

confidence: 74%

Mass Transfer Performance and Hydrodynamics of a Bubble Column Reactor at Offshore Floating Conditions

Heydari

Larachi

Kipping

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Hydrodynamics and mass transfer characteristics are analyzed in a bubble column subjected to simulated ship motions using a hexapod robot with six-degree-of-freedom motions. Wire-mesh sensors have been used for collecting local gas holdup and flow patterns under nonreactive conditions. Additionally, the electrical conductivity of the liquid phase during CO 2 uptake was extracted to determine hydroxide ion consumption rates as an indicator of mass transfer. The two-phase flow patterns in the bubble column operating under offshore conditions deviate significantly from the stationary ones due to the buoyancy-driven lateral migration of bubbles. The consumption rates of hydroxide ions during the chemical absorption of CO 2 revealed that the amplitude of oscillations imposed on the bubble column is the dominant factor for the mass transfer in moving columns. Contrarily, the effect of the oscillation frequency is negligible, which is attributed to bubble coalescence and bubble flow maldistribution in the bubble column subjected to rotational oscillations. Bubble-free zones are formed in the liquid phase because of the buoyancy effects in the column tilted from the vertical axis, while the frequency of the oscillations does not add any additional effects to the bubble kinematics. The latter is attributed to the low shear rates maintained over the range of frequencies simulating marine swells.

show abstract

Section: Resultsmentioning

confidence: 74%

Mass Transfer Performance and Hydrodynamics of a Bubble Column Reactor at Offshore Floating Conditions

Heydari

Larachi

Kipping

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…The sliding bubbles over tilted surfaces in a quiescent fluid showed more complex motion than for a flat surface. [33][34][35] The complex motion is especially enhanced in a liquid base flow. Figure 1 illustrates the situations adopted in the present study.…”

Section: Introductionmentioning

confidence: 99%

Lift coefficient of bubble sliding inside turbulent boundary layers in an inclinable channel flow

et al. 2022

View full text Add to dashboard Cite

The behavior of bubbles traveling in the proximity of a tilted wall is studied experimentally to understand the fundamental sliding motion of bubbles inside turbulent boundary layers along an inclined wall. The qualitative visualization of sliding bubbles confirms the contribution of bubble buoyancy on the sliding motion for negative and positive inclinations of the channel. An opto-acoustic combined measurement technique is adopted to explore the sliding motion. Liquid velocity profiles in the bubbly flow and the distance between the wall and bottom of the bubble are obtained using the ultrasound pulsed Doppler method, while the bubble diameters and velocities are obtained from particle-tracking type image processing. The combined measurements reveal that the velocity of bubbles decreases under the negative slope condition and increases under the positive slope condition due to opposite buoyancy effects. In addition, the distance between the wall and bottom of the bubble increases with an increase in negative inclination. The lift coefficient is derived from the measured variables using a force–balance equation among the buoyancy, lift, and surface tension. Finally, we propose modeling equations for the lift coefficient expressed in terms of the Reynolds, Weber, and Bond numbers, which apply to the bubbles inside boundary layers.

show abstract

“…In the case of φ=40˚, the geometric factor becomes dominant. Considering that the wall-parallel velocity of a single bubble near the wall decreases monotonically with increasing φ [40], the non-monotonous dependence of the wallparallel mean velocity of bubbles on the wall inclination is recognized as a unique feature observed in the case of near-wall injection of bubbles. …”

Section: Bubble Concentration and Wall-parallel Mean Velocity Of Bubblesmentioning

confidence: 99%

Effect of heated wall inclination on natural convection heat transfer in water with near-wall injection of millimeter-sized bubbles

Kitagawa

Denissenko

Murai

2017

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. ABSTRACT Natural convection heat transfer from a heated wall in water with near-wall injection of millimeter-sized bubbles is studied experimentally. Velocity and temperature measurements are conducted in the near-wall region. In the range of the heated wall angles from 0 to 40˚ from the vertical, the heat transfer coefficient increases by up to an order of magnitude with bubble injection. The ratio of the heat transfer coefficient with bubble injection to that without injection increases with the wall inclination angle. Based upon measured liquid temperature distributions and liquid flow velocity profiles, enhancement of heat transfer by bubble injection is explained by two mechanisms. First, wall-parallel transport of cold liquid into the thermal boundary layer is enhanced by the bubbledriven flow. Second, wall-normal mixing of warm liquid and cold liquid occurs, as a result of wall-normal velocity fluctuations of the liquid phase activated by a combination of bubble rising motion, vortex shedding from the bubbles, and unsteady vortices formed within the boundary layer. The unsteady vortices travel along the wall together with the bubbles, primarily contributing to the enhancement of heat transfer at higher wall inclination angles.

show abstract

Conditions for the sliding-bouncing transition for the interaction of a bubble with an inclined wall

Cited by 11 publications

References 13 publications

Mass Transfer Performance and Hydrodynamics of a Bubble Column Reactor at Offshore Floating Conditions

Mass Transfer Performance and Hydrodynamics of a Bubble Column Reactor at Offshore Floating Conditions

Lift coefficient of bubble sliding inside turbulent boundary layers in an inclinable channel flow

Effect of heated wall inclination on natural convection heat transfer in water with near-wall injection of millimeter-sized bubbles

Contact Info

Product

Resources

About