Large and small bubble interaction patterns in a bubble column

Tsuchiya, Katsumi; Ohsaki, Katsuichiro; Taguchi, Koji

doi:10.1016/0301-9322(95)00052-6

Cited by 13 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whereas artifacts, like ghosting, between plumes (not side lobe return) can be spatially segregated, this is not feasible for such artifacts inside the plume. Here the bubbles are within a few centimeters (∼ 10-20 r e ) of each other, such as bubbles in the wake of a larger bubble (Tsuchiya et al, 1996) and near the seabed, acoustic coupling leads to frequency shifts (Leifer and Tang, 2006) that decrease σ .…”

Section: Sonar Seep Bubble Observationsmentioning

confidence: 99%

Sonar gas flux estimation by bubble insonification: application to methane bubble flux from seep areas in the outer Laptev Sea

et al. 2017

View full text Add to dashboard Cite

Abstract. Sonar surveys provide an effective mechanism for mapping seabed methane flux emissions, with Arctic submerged permafrost seepage having great potential to significantly affect climate. We created in situ engineered bubble plumes from 40 m depth with fluxes spanning 0.019 to 1.1 L s −1 to derive the in situ calibration curve (Q(σ )). These nonlinear curves related flux (Q) to sonar return (σ ) for a multibeam echosounder (MBES) and a single-beam echosounder (SBES) for a range of depths. The analysis demonstrated significant multiple bubble acoustic scattering -precluding the use of a theoretical approach to derive Q(σ ) from the product of the bubble σ (r) and the bubble size distribution where r is bubble radius. The bubble plume σ occurrence probability distribution function ( (σ )) with respect to Q found (σ ) for weak σ well described by a power law that likely correlated with small-bubble dispersion and was strongly depth dependent. (σ ) for strong σ was largely depth independent, consistent with bubble plume behavior where large bubbles in a plume remain in a focused core.(σ ) was bimodal for all but the weakest plumes. Q(σ ) was applied to sonar observations of natural arctic Laptev Sea seepage after accounting for volumetric change with numerical bubble plume simulations. Simulations addressed different depths and gases between calibration and seep plumes. Total mass fluxes (Q m ) were 5.56, 42.73, and 4.88 mmol s −1 for MBES data with good to reasonable agreement (4-37 %) between the SBES and MBES systems. The seepage flux occurrence probability distribution function ( (Q)) was bimodal, with weak (Q) in each seep area well described by a power law, suggesting primarily minor bubble plumes. The seepage-mapped spatial patterns suggested subsurface geologic control attributing methane fluxes to the current state of subsea permafrost.

show abstract

Section: Sonar Seep Bubble Observationsmentioning

confidence: 99%

Sonar gas flux estimation by bubble insonification: application to methane bubble flux from seep areas in the outer Laptev Sea

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Others have also differentiated between large and small bubbles in bubble columns. 13,14,[39][40][41][42] For example, De Swart et al 13 also used d B ) 10 mm as the demarcation between large and small bubbles.…”

Section: Air-water (C ) 0%)mentioning

confidence: 99%

Bubble Size in a Cocurrent Fiber Slurry

Heindel

2002

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Bubble diameter measurements in a two-dimensional cocurrent bubble column are obtained using a gas−liquid−solid system in which the solid component is a cellulose fiber. Flash X-ray radiography, a noninvasive measurement technique, is used to record bubble size in the opaque slurry at various operating conditions. Results are presented for a range of fiber mass fractions (0 ≤ C ≤ 1.5%), a range of superficial gas velocities (1 ≤ υg ≤ 4 cm/s), two superficial liquid velocities (υl = 1 or 2 cm/s), and two column heights (H = 15−40 or 115−140 cm). Bubbles are categorized as either large (dB > 10 mm) or small (dB ≤ 10 mm), and all bubble diameter distributions can be characterized by log-normal distributions. The presence of fibers has the most significant effect on the large bubble size and population, even at mass fractions as low as 0.5%. In general, the large bubble size and population increases with column height, superficial gas velocity, and fiber mass fraction. Bubble diameter measurements in a two-dimensional cocurrent bubble column are obtained using a gas-liquid-solid system in which the solid component is a cellulose fiber. Flash X-ray radiography, a noninvasive measurement technique, is used to record bubble size in the opaque slurry at various operating conditions. Results are presented for a range of fiber mass fractions (0 e C e 1.5%), a range of superficial gas velocities (1 e υ g e 4 cm/s), two superficial liquid velocities (υ l ) 1 or 2 cm/s), and two column heights (H ) 15-40 or 115-140 cm). Bubbles are categorized as either large (d B > 10 mm) or small (d B e 10 mm), and all bubble diameter distributions can be characterized by log-normal distributions. The presence of fibers has the most significant effect on the large bubble size and population, even at mass fractions as low as 0.5%. In general, the large bubble size and population increases with column height, superficial gas velocity, and fiber mass fraction. Disciplines Mechanical Engineering Comments Reprinted with permission from

show abstract

“…For a swarm of bubbles with Eo numbers ranging from 6.0 to 27.5, the wake attraction was found to be the main interaction mechanism, and the tendency of the bubbles to form chimneys under such condition was speculated to be relevant to the flow regime transitions (Stewart, 1995). The interactions between large spherical cap bubbles and between large and small bubbles in a swarm have also been investigated (Krishna et al, 1999;Tsuchiya et al, 1996). The effect of volume fraction of the bubbles on the rise velocity of the bubble swarm has been studied for millimeter sized bubbles.…”

Section: Introductionmentioning

confidence: 97%