Breakup of Bubbles Rising in Liquids of Low and Moderate Viscosity

Wichterle, Kamil; Wichterlová, Jana; Kulhánková, Lenka

doi:10.1080/00986440590495034

Cited by 9 publications

(8 citation statements)

References 4 publications

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“…17 For sufficiently high E O , rupture of the bubble will occur leading to vigorous liquid flow. 17 For sufficiently high E O , rupture of the bubble will occur leading to vigorous liquid flow.…”

Section: Behaviour Of Rising Gas Bubblesmentioning

confidence: 99%

Rigorous buoyancy driven bubble mixing for centrifugal microfluidics

et al. 2016

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We present batch-mode mixing for centrifugal microfluidics operated at fixed rotational frequency. Gas is generated by the disk integrated decomposition of hydrogen peroxide (H2O2) to liquid water (H2O) and gaseous oxygen (O2) and inserted into a mixing chamber. There, bubbles are formed that ascent through the liquid in the artificial gravity field and lead to drag flow. Additionaly, strong buoyancy causes deformation and rupture of the gas bubbles and induces strong mixing flows in the liquids. Buoyancy driven bubble mixing is quantitatively compared to shake mode mixing, mixing by reciprocation and vortex mixing. To determine mixing efficiencies in a meaningful way, the different mixers are employed for mixing of a lysis reagent and human whole blood. Subsequently, DNA is extracted from the lysate and the amount of DNA recovered is taken as a measure for mixing efficiency. Relative to standard vortex mixing, DNA extraction based on buoyancy driven bubble mixing resulted in yields of 92 ± 8% (100 s mixing time) and 100 ± 8% (600 s) at 130g centrifugal acceleration. Shake mode mixing yields 96 ± 11% and is thus equal to buoyancy driven bubble mixing. An advantage of buoyancy driven bubble mixing is that it can be operated at fixed rotational frequency, however. The additional costs of implementing buoyancy driven bubble mixing are low since both the activation liquid and the catalyst are very low cost and no external means are required in the processing device. Furthermore, buoyancy driven bubble mixing can easily be integrated in a monolithic manner and is compatible to scalable manufacturing technologies such as injection moulding or thermoforming. We consider buoyancy driven bubble mixing an excellent alternative to shake mode mixing, in particular if the processing device is not capable of providing fast changes of rotational frequency or if the low average rotational frequency is challenging for the other integrated fluidic operations.

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Section: Behaviour Of Rising Gas Bubblesmentioning

confidence: 99%

Rigorous buoyancy driven bubble mixing for centrifugal microfluidics

et al. 2016

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“…First, this requires an experimental set-up in which a rising bubble can be observed over a long time. Following the idea of Wichterle et al 12 , this has been obtained by immersing a bubble in a slightly rotating downward flow through a slightly divergent pipe. Second, it also requires to generate a calibrated turbulent flow with an intensity large enough to cause the bubble breakup.…”

Section: Introductionmentioning

confidence: 99%

On the dynamics and breakup of a bubble rising in a turbulent flow

Ravelet¹,

Colin²,

Risso³

2011

Physics of Fluids

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Experimental investigations of the dynamics of a deformable bubble rising in a uniform turbulent flow are reported. The turbulence is characterized by fast PIV. Time-resolved evolutions of bubble translation, rotation and deformation are determined by three-dimensional shape recognition from three perpendicular camera views. The bubble dynamics involves three mechanisms fairly decoupled: (i) average shape is imposed by the mean motion of the bubble relative to liquid; (ii) wake instability generates almost periodic oscillations of velocity and orientation; (iii) turbulence causes random deformations that sometimes lead to breakup. The deformation dynamics is radically different from that observed in the absence of a significant sliding motion due to buoyancy. Large deformations that lead to breakup are not axisymmetric and correspond to elongations in the horizontal direction. The timescale of decay of shape oscillations is of the same order as their natural frequency f 2 , so that breakup always results from the interaction with a single turbulent eddy. This overdamping causes the statistics of large deformations and the statistics of breakup identical to the statistics of turbulence. The bubble response time f −1 2 however controls the duration of individual breakup events.

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“…An empirical power‐law function fits approximately the experimental data 67. According to this result, the kinetic constant in (1) can be expressed as a function of bubble volume where …”

Section: Methodsmentioning

confidence: 62%

“…We have developed a similar equipment which enables to observe the behaviour of freely rising bubbles qualitatively and quantitatively under defined conditions. Breakup of rising medium size bubbles with diameters d 0 = 2.5 − 11 mm was studied in our laboratory in water and glycerol solutions 67 and recently in butyl alcohol and in water with electrolyte or polymer additives 68. Apparently the large bubbles are essentially unstable.…”

Section: Methodsmentioning

confidence: 99%

Breakup of Gas Bubbles Rising in Molten Metals

Wichterle

2010

steel research int.

Self Cite

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A theory on the breakup of rising bubbles is developed on the basis of long‐term experiments with bubbles rising in different liquids. The probability of bubble breakup is expressed in terms of half‐life as a dimensionless function of the bubble volume and liquid properties. The results are applied to develop a mathematical model of bubbles rising in a column of high density liquid under a low external pressure. The model predicts that in typical steelmaking equipment the size of bubbles approaching the liquid level depends mostly on the external pressure and it is quite independent of the original size of the bubbles.

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Breakup of Bubbles Rising in Liquids of Low and Moderate Viscosity

Cited by 9 publications

References 4 publications

Rigorous buoyancy driven bubble mixing for centrifugal microfluidics

Rigorous buoyancy driven bubble mixing for centrifugal microfluidics

On the dynamics and breakup of a bubble rising in a turbulent flow

Breakup of Gas Bubbles Rising in Molten Metals

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