A pressure correction‐volume of fluid method for simulation of two‐phase flows

Interaction of two in-line bubbles with different size in a viscous liquid is studied using volume-of-fluid method. Simulations are performed on initially spherical bubbles starting from rest. The influences of size ratio 0.5 ≤ R ≥ 1 and initial distance ratio 1.7 ≤ S ≥ 3 are investigated with fixed Eötvös number Eo = 50, Galilei number Ga = 100, density ratio η = 1,000, and viscosity ratio λ = 100. Two arrangement patterns are considered, the small-big arrangement (SBA) and big-small arrangement (BSA). Two distinct evolution regimes are defined: coalescence and penetration. The bubble-bubble interaction is intensified by increasing R and decreasing S, promoting the possibility of coalescence. Penetration is more prone to occur in BSA than in SBA, and it is absent in BSA when R ≤ 0.625 regardless of S. The ascending velocity of the leading bubble (LB) is nearly independent of size ratio, initial distance ratio, and arrangement pattern, since the motion of the LB is little influenced by the trailing bubble (TB). Meanwhile, the ascending velocity of the TB increases with increasing R and decreasing S. The LB usually plays a dominant role in the interaction, especially in BSA.KEYWORDS arrangement pattern, bubble-bubble interaction, initial distance ratio, size ratio, VOF

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“…Here, δ and k are defined as

δ = (||, \nabla γ_{g}),

k = \nabla \cdot boldn,

respectively. For details about the calculation of curvature, readers can refer to Seifollahi et al and Lin et al…”

Section: Numerical Aspectsmentioning

confidence: 99%

Interaction of two differently sized bubbles in a viscous liquid

Zhang

Chen

You

et al. 2018

Asia-Pacific J Chem Eng

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“…It is designed for two or more immiscible fluids where the position of the interface between the fluids is of interest. VOF is commonly used by researchers to model stratified flow, two-phase flow, and free surface flow [14][15][16]. Meanwhile, the realizable k-ε turbulence model of Shih et al (1995) [17] was selected in this study, due to its superior performance in jet flow and have proven by Ozan & Yüksel (2010) and Farzad & Hamed (2010) [18,19].…”

Section: Computational Fluids Dynamics Setupmentioning

confidence: 99%

Experimental and CFD Modelling: Impact of the Inlet Slug Flow on the Horizontal Gas–Liquid Separator

et al. 2018

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For a gas-liquid separator sizing, many engineers have neglected the flow pattern of incoming fluids. The impact of inlet slug flow which impeded onto the separator’s liquid phase will cause a separator fails to perform when sloshing happened in the separator. To date, the study on verifying the impact of inlet slug flow in a separator remains limited. In this paper, the impact of inlet momentum and inlet slug flow on the hydrodynamics in a separator for cases without an inlet device were investigated. The experimental and Computational Fluid Dynamics (CFD) results of cavity formation and sloshing occurrence in the separator in this study were compared. A User Defined Function (UDF) was used to describe the inlet slug flow at the separator inlet. Inlet slug flow occurred at inlet momentum from 200 to 1000 Pa, and sloshing occurred in the separator at 1000 Pa. Both experimental and simulated results showed similar phenomena.

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