Bubble break-up in gas—liquid bioreactors: Break-up in turbulent flows

Walter, J. F.; Blanch, Harvey W.

doi:10.1016/0300-9467(86)85011-0

Cited by 127 publications

(65 citation statements)

References 4 publications

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“…12 Walter and Blanch studied bubble breakup and identified three stages that characterize the breakup mechanism: oscillation, dumbbell stretching, and pinching off. 13 It was concluded from the study that two fragments were formed. No information about the final size distributions was given.…”

Section: Experimental Observations On Bubble and Drop Breakupmentioning

confidence: 99%

On the breakup of fluid particles in turbulent flows

2006

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Section: Experimental Observations On Bubble and Drop Breakupmentioning

confidence: 99%

On the breakup of fluid particles in turbulent flows

2006

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“…Following Kolmogorov and Hinze, many investigators have studied bubble or drop size distributions in turbulent flows theoretically and experimentally (Coulaloglou and Tavlarides, 1977;Walter and Blanch, 1986;Prince and Blanch, 1990;Bouaifi and Roustan, 1998). Although most researchers used the Kolmogorov-Hinze theory, many formulas were proposed to predict the maximum stable bubble or drop size, and a wide range of critical Weber numbers was obtained based on different assumptions and experiments.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Bubble Breakup Dynamics in Homogeneous Turbulence

Qian

McLaughlin

Sankaranarayanan

et al. 2006

Chemical Engineering Communications

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This article presents numerical simulation results for the deformation and breakup of bubbles in homogeneous turbulence under zero gravity conditions. The lattice Boltzmann method was used in the simulations. Homogeneous turbulence was generated by a random stirring force that acted on the fluid in a three-dimensional periodic box. The grid size was sufficiently small that the smallest scales of motion could be simulated for the underlying bubble-free flow. The minimum Weber number for bubble breakup was found to be about 3. Bubble breakup was stochastic, and the average time needed for breakup was much larger for small Weber numbers than for larger Weber numbers. For small Weber numbers, breakup was preceded by a long period of oscillatory behavior during which the largest linear dimension of the bubble gradually increased. For all Weber numbers, breakup was preceded by a sudden increase in the largest linear dimension of the bubble. When the Weber number exceeded the minimum value, the average surface area increased by as much as 80%.

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“…N cd can be determined by simple methods such as visual observation, from the power input curve, and from mixing time studies (Rewatkar and Joshi, Zhu et al (2001) 0.39 6DT Ring 0.13 1 ¥ 10 -3 to 100-1500 Dynamic method 7.5 ¥ 10 -3 stresses) outweigh the surface tension force (Hinze, 1955;Calderbank et al, 1959;Walter and Blanch ,1986). Walter and Blanch (1986) gave the correlation of maximum stable bubble size on the assumption that bubble break-up is caused by the eddies of the same scale as the maximum stable bubble size. Parthasarathy and Ahmed (1991) have discussed the process of bubble break-up in a turbulent field using the criterion of power dissipation according to Kolmogoroff's theory.…”

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Gas—Liquid Mass Transfer Coefficient in Stirred Tank Reactors

et al. 2002

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Volumetric gas—liquid mass transfer coefficient (kLa) data available in the literature for larger tanks (T = 0.39 m to 2.7 m) have been analyzed on the basis of relative dispersion parameter, N/Ncd. It was observed that at a given superficial gas velocity (VG), kLa values were approximately the same irrespective of geometric configuration (size of the tank, type and size of the impellers, type of the sparger, etc.) at a particular N/Ncd. A single correlation based on N/Ncd is presented which shows satisfactory agreement with the kLa data of different workers.

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Bubble break-up in gas—liquid bioreactors: Break-up in turbulent flows

Cited by 127 publications

References 4 publications

On the breakup of fluid particles in turbulent flows

On the breakup of fluid particles in turbulent flows

Simulation of Bubble Breakup Dynamics in Homogeneous Turbulence

Gas—Liquid Mass Transfer Coefficient in Stirred Tank Reactors

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