Experimental and simulation studies of the shape and motion of an air bubble contained in a highly viscous liquid flowing through an orifice constriction

Hallmark, Bart; Chen, C.-H.; Davidson, John

doi:10.1016/j.ces.2019.04.043

Cited by 9 publications

(3 citation statements)

References 62 publications

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“…Similar observations can be made to those resulting from Figure 7, notably (i) that a combination of roundness and convexity ratio appears to give good quantitative information concerning the change of bubble shape and (ii) that elongation ratio and roundness measurements derived from the geometric theory again qualitatively capture some of the trends observed experimentally. A further study by the same authors (Hallmark et al, 2019) has been carried out that compares predictions from computational fluid dynamics to images similar to those presented in this paper.…”

Section: Bubble Shapes: Experiments and Theory Comparedmentioning

confidence: 95%

The motion and shape of a bubble in highly viscous liquid flowing through an orifice

Chen

Hallmark

Davidson

2019

Chemical Engineering Science

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Experiments and theory concern the behaviour of a small bubble carried through an orifice by a very viscous liquid. The liquid was polybutene oil, of viscosity about 70 Pa s, i.e. 70,000 times that of water. The Reynolds number of the flow is substantially less than one, hence the flow pattern is approximately radial flowing into, and away from, the orifice. These flow patterns have profound effects on the shape of an entrained bubble. On the upstream side, the acceleration of the liquid, as it approaches the orifice, causes elongation of the bubble since the front of the bubble moves faster than the back. On the downstream side, the reverse occurs: the back of the bubble moves fast than the front. Thus the height of the bubble diminishes as it moves away from the orifice, leading to the formation of a 'crescentmoon' shape. The shape of these bubbles can be predicted by considering the motion of a droplet of the same liquid replacing the bubble: the resulting geometric theory gives good predictions of bubble deformation approaching the orifice and of 'crescent-moon' formation downstream of the orifice.

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Section: Bubble Shapes: Experiments and Theory Comparedmentioning

confidence: 95%

The motion and shape of a bubble in highly viscous liquid flowing through an orifice

Chen

Hallmark

Davidson

2019

Chemical Engineering Science

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“…Bubble shape is a key factor of the motion characteristics. A lot of work had been carried out to study the bubble shape in a single liquid rather than immiscible liquids [4][5][6][7]. In many practical industrial processes [8], however, the bubble is in immiscible fluids.…”

Section: Introductionmentioning

confidence: 99%

Deformation characteristics of the bubble in water-biodiesel immiscible fluids

Zhang

Qing

et al. 2022

THERM SCI

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It is of great significance to investigate the rising behavior of a bubble in immiscible fluids in chemical and metallurgical engineering. A three-dimensional model is established and the free-floating behavior of a single bubble in immiscible fluids (water-heavier liquid, biodiesel-lighter liquid) is numerically simulated by phase-field method. After the fluctuation of a certain distance, the bubble tends to be stable. It takes more time for the larger bubble to reach a stable shape than for the smaller one. The terminal aspect ratio of bubble (ET) with the same size in heavier liquid is smaller than that in lighter liquid. With the increase of bubble size, ET becomes small both in heavier and lighter liquid. Comparing bubble vortex diagrams of different shapes shows that the maximum vortex intensity is the direction in which the bubble shape extends. When the bubble passes through the liquid-liquid interface, it will form ?pear?, ?inverted pear?, ?convex? and ?water drop? shapes successively.

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“…Previous studies have also closely considered interaction and turbulence simulation models to effectively simulate bubble plume, each with a different closure relation model. Liu and Luo [21] found the effect of surface tension on the oscillation behavior of bubble plume is obvious. In addition, the gas velocity is also very important for the prediction of plume oscillation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Plume Offset Characteristics in Bubble Columns by Euler–Euler Simulation

et al. 2020

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Based on low-cost and easy to enlarge, the bubble column device has been widely concerned in chemical industry. This paper focuses on bubble plumes in laboratory-scale three-dimensional rectangular air-water columns. Static behavior has been investigated in many experiments and simulations, and our present investigations consider the dynamic behavior of bubble plume offset in three dimensions. The investigations are conducted with a set of closure models by the Euler–Euler approach, and subsequently, literature data for rectangular bubble columns are analyzed for comparison purposes. Moreover, the transient evolution characteristics of the bubble plume in the bubble column and the gas phase distribution in sections are introduced, and the offset characteristics and the oscillation period of the plume are analyzed. In addition, the distributions of the vector diagram of velocity and vortex intensity in the domain are given. The effects of different fluxes and column aspect ratios on bubble plumes are studied, and the offset and plume oscillation period (POP) characteristics of bubbles are examined. The investigations reveal quantitative correlations of operating conditions (gas volume flux) and aspect ratios that have not been reported so far, and the simulated and experimental POP results agree well. An interesting phenomenon is that POP does not occur under conditions of a high flux and aspect ratio, and the corresponding prediction values for the conditions with and without POP are given as well. The results reported in this paper may open up a new way for further study of the mass transfer of bubble plumes and development of chemical equipment.

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Experimental and simulation studies of the shape and motion of an air bubble contained in a highly viscous liquid flowing through an orifice constriction

Abstract: Experimental and simulation studies of the shape and motion of an air bubble contained in a highly viscous liquid flowing through an orifice constriction, Chemical Engineering Science (2019), doi:

Cited by 9 publications

References 62 publications

The motion and shape of a bubble in highly viscous liquid flowing through an orifice

The motion and shape of a bubble in highly viscous liquid flowing through an orifice

Deformation characteristics of the bubble in water-biodiesel immiscible fluids

Investigation of Plume Offset Characteristics in Bubble Columns by Euler–Euler Simulation

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