Effect of bubble interactions on mass transfer in bubbly flow

Aboulhasanzadeh, Bahman; Tryggvason, Grétar

doi:10.1016/j.ijheatmasstransfer.2014.08.027

Cited by 42 publications

(13 citation statements)

References 31 publications

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“…The phenomenon of gaseous bubbles rising together in liquid is not only encountered in many chemical and petrochemical applications, such as bubble column reactors, heat exchangers [1,2], but also in natural phenomena [4]. In industrial applications, gaseous bubbles are frequently used to enhance the heat and mass transfer, and this enhancement depends primarily on the interaction and distribution of bubbles, apart from the flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

Two initially spherical bubbles rising in quiescent liquid

et al. 2017

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A pair of bubbles starting from rest and rising side-by-side in a liquid have been shown earlier to display spherical and ellipsoidal shapes. In contrast to earlier computational studies on the two-dimensional dynamics of a pair of bubbles, we study the fully three-dimensional motion of the bubbles in the inertial regime. We reveal the destabilizing nature of the interaction between the wakes of the bubbles, which causes them to rise in an oscillatory path. Such three dimensionality sets in earlier in time than for a single bubble and also at a lower inertia. The interaction leads to a mirror symmetry in the trajectories of the two bubbles, which persists for some time even in the high inertia regime where each path is chaotic. The e↵ect of the inertia and initial separation on the mirror symmetry of the path, the vortex shedding pattern and the attraction/repulsion between the bubbles are examined. The bubble rise has been interestingly observed to be symmetrical about the plane perpendicular to the separation vector for all separation distances considered in the present study.

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Section: Introductionmentioning

confidence: 99%

Two initially spherical bubbles rising in quiescent liquid

et al. 2017

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“…The accuracy of the approach was demonstrated by comparisons with fully resolved simulations of two-dimensional flows. Subsequent comparisons with experimental results in Aboulhasanzadeh et al (2013) showed excellent agreement and the method was then applied to examine how bubble interactions influenced mass transfer (Aboulhasanzadeh and Tryggvason, 2014). The results were compared with predictions by a simple cell model where the bubbles remain fixed in a periodic array, and showed that although the interactions increased mass transfer, the freely evolving bubbles are also slowed down, which decreases the mass transfer.…”

Section: Complex Bubbly Flowsmentioning

confidence: 94%

Direct numerical simulations of bubbly flows

Tryggvason

2015

Mechanical Engineering Reviews

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Abstract. The status of direct numerical simulations of bubbly flows is reviewed and a few recent results are presented. The development of numerical methods based on the one-field formulation has made it possible to follow the evolution of a large number of bubbles for a sufficiently long time so that converged statistics for the averaged properties of the flow can be obtained. In addition to extensive studies of homogeneous bubbly flows, recent investigations have helped give insight into drag reduction due to the injection of bubbles into turbulent flows and two-fluid modeling of laminar multiphase flows in channels.

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“…We have also compared the results of a three-dimensional implementation with experimental results, specially designed to test our method, and with experimental correlations from the literature, and in both cases we find excellent agreement 45 . The new method has also been used to examine in some detail the effect that bubble-bubble interactions have on the mass transfer of freely moving bubbles 46 .…”

Section: Multiscale Models For Small Scalesmentioning

confidence: 99%

Direct Numerical Simulations of Flows with Phase Change

Tryggvason

2015

Procedia IUTAM

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Direct Numerical Simulations (DNS) of multiphase flows, where every continuum length and time scale are fully resolved, currently allow us to simulate flows of considerable complexity, such as the motion of several hundred bubbles or drops in turbulent flows, for sufficiently long time so that meaningful statistical quantities can be obtained. Additional physical processes such as heat transfer and phase change have also been included, although only for relatively small systems so far. After reviewing briefly recent studies of bubbles in turbulent channel flows, we discuss simulations of flows with phase change, focusing on bubble generation by boiling. The addition of new physics often results in new length and time scales that are shorter and faster than the dominant flow scales. Similarly, very small features such as thin films, filaments, and drops can also arise during coalescence and breakup of fluid blobs. The geometry of these features is usually simple, since surface tension effects are strong and inertia effects are relatively small and in isolation these features are often well described by analytical or semi-analytical models. Recent efforts to embed analytical and semi-analytical models to capture such features, in combination with direct numerical simulations of the rest of the flow, are discussed. We conclude by a short discussion of the use of DNS data for closure laws for model equations for the large scale flow.

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Effect of bubble interactions on mass transfer in bubbly flow

Cited by 42 publications

References 31 publications

Two initially spherical bubbles rising in quiescent liquid

Two initially spherical bubbles rising in quiescent liquid

Direct numerical simulations of bubbly flows

Direct Numerical Simulations of Flows with Phase Change

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