2020
DOI: 10.1103/physreve.101.023106
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General power-law temporal scaling for unequal-size microbubble coalescence

Abstract: We systematically study the effects of liquid viscosity, liquid density, and surface tension on global microbubble coalescence using lattice Boltzmann simulation. The liquid-gas system is characterized by Ohnesorge number Oh ≡ η h / √ ρ h σ r F with η h , ρ h , σ , and r F being viscosity and density of liquid, surface tension, and the radius of the larger parent bubble, respectively. This study focuses on the microbubble coalescence without oscillation in an Oh range between 0.5 and 1.0. The global coalescenc… Show more

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Cited by 12 publications
(10 citation statements)
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“…1. In our previous study [34], a switching of the major axis of the coalescing bubble between the horizontal and vertical directions was observed, when the Oh number is relatively small, in the post-coalescence corresponding to the period from (c) to (g) in Fig. 1.…”
Section: Computational Set-upmentioning
confidence: 64%
See 1 more Smart Citation
“…1. In our previous study [34], a switching of the major axis of the coalescing bubble between the horizontal and vertical directions was observed, when the Oh number is relatively small, in the post-coalescence corresponding to the period from (c) to (g) in Fig. 1.…”
Section: Computational Set-upmentioning
confidence: 64%
“…The in-house, GPU-accelerated LBM code based on the free-energy model is used for all the simulation in this work. The reliability of this LBM model has been demonstrated in some application studies [30,35,34] previously through comparisons with analytical solutions and experimental/computational results. The spatial resolution was selected 600 2 through a convergence check [34].…”
Section: Computational Set-upmentioning
confidence: 92%
“…The novelty of this computational approach consists of (1) a unique extraction of flow domain and local wall normality from image data, (2) a seamless connection between the output of image processing and the input of CFD, (3) an en-route calculation of strain-rate tensor for wall stresses, and (4) GPU parallel computing processing 29 32 (not included in this paper) to significantly mitigate the computation burden. The kinetic-based lattice Boltzmann modeling has emerged for simulating a broad class of complex flows including pore-scale porous media flow 33 37 , multiphase/multicomponent flows 38 42 , and turbulence 40 , 43 47 . The main advantages related to this work are its amenability for modeling the intermolecular interactions at the two-phase interface to recover the appropriate multiphase dynamics without demanding computing cost and its suitability for scalable GPU (Graphics Processing Unit) parallelization 29 , 31 , 32 , 40 , 43 48 to achieve fast computation.…”
Section: Introductionmentioning
confidence: 99%
“…There have been many studies on the phenomenon and mechanism of bubble coalescence through experiments [11][12][13][14][15][16][17][18][19], theoretical analyses [12,20,21] and numerical simulations [14,[22][23][24][25][26][27][28][29][30][31]. Stover, et al [14] first investigated the turbulence characteristics of coalescence of bubbles with different sizes, viscosities, and surface tensions.…”
Section: Introductionmentioning
confidence: 99%
“…They simulated the bubble coalescence at a high-density ratio using LBM [24]. A similar approach, solving Navier-Stokes equations and Cahn-Hilliard interface evolution equation by LBM, was used by Chen, et al to study the coalescence of unequal-size or equal-size bubbles [25][26][27]. They presented power-law relations between the global coalescence time and size inequality, and the effect of the Ohnesorge (Oh) number on those power-law relations.…”
Section: Introductionmentioning
confidence: 99%