Bubbles in Non-Newtonian Fluids: A Multiscale Modeling

Frank, Xavier; Charpentier, Jean‐Claude; Canneviere, Frederic; Midoux, N.; Li, Huai Z.

doi:10.2516/ogst/2012085

Cited by 3 publications

(1 citation statement)

References 32 publications

(34 reference statements)

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“…[54] As bubble phenomena are inherently complex, a complete theoretical analysis of such systems remains incomplete. [55] The excellent capabilities of CFD enable the simulation and analysis of multiphase flows faster without real-time experiments. [56] The significance of physical effects such as gravity and surface tension can be identified since the inclusion or exclusion of such forces is at the discretion of the user.…”

Section: Introductionmentioning

confidence: 99%

Bubble size distribution and gas holdup in bubble columns employing non‐Newtonian liquids: A CFD study

Paul

Pakzad

2022

Can J Chem Eng

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The hydrodynamics involved with the rise of air bubbles in shear‐thinning non‐Newtonian liquids in bubble columns was investigated using computational fluid dynamics (CFD). In bubble columns, the bubble size distribution (BSD) and gas holdup significantly affect the mass transfer rates and the reactor design. Consequently, the influence of superficial gas velocity, flow index, consistency index, sparger bubble size, and yield stress were analyzed on a local and global scale. The bubble sizes and the coalescence and breakage phenomena were incorporated using the homogeneous discrete method of the population balance model (PBM). The bubbles underwent coalescence during ascent and exhibited bimodal distribution. The radial homogeneity of the gas phase increased axially. Moreover, the zones of low liquid dynamic viscosity produced zones of a high gas holdup. Though the dual effect of viscosity on gas holdup was non‐existent, the gas holdup surged after 35.1 mPa s at the mid‐zone and remained constant thereafter. The noteworthy differences in simulation results put further emphasis upon the importance of sparger bubble size in CFD modelling. A decrease in the overall gas holdup and the axial air velocity with yield stress was observed. CFD simulation proved capable of providing results in reasonable agreement with experiments.

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Section: Introductionmentioning

confidence: 99%

Bubble size distribution and gas holdup in bubble columns employing non‐Newtonian liquids: A CFD study

Paul

Pakzad

2022

Can J Chem Eng

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Numerical simulations of bubble behavior and mass transfer in CO 2 capture system with ionic liquids

Bao

Xin

Dong

et al. 2015

Chemical Engineering Science

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The evolution of a three-dimensional microbubble at a corner in a Maxwell fluid

O'Brien,

Mahmud,

Smith

et al. 2023

Physics of Fluids

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Bubbles often appear in non-Newtonian liquids from nature, engineering to biomedical applications, but their study has been under research compared to their Newtonian counterpart. Here, we extend the axisymmetric modeling of Lind and Phillips to three-dimensional modeling. The approach is based on the boundary integral method coupled with the Maxwell constitutive equation. The flow is assumed to have moderate to high Reynolds numbers and, thus, is irrotational in the bulk domain. The viscoelastic effects are incorporated approximately in the normal stress balance at the bubble surface. The numerical model has excellent agreement with the corresponding Rayleigh–Plesset equation for spherical bubbles in a non-Newtonian liquid. Computations are carried out for a bubble near a corner at various angles. The numerical results agree very well with the experiments for bubbles in a Newtonian fluid in a corner. As the Deborah number increases, the amplitude and period of the bubble oscillation increase, the bubble migration to the corner enhances, and the bubble jet is broader, flatter, and inclined more to the further boundary. This implies an improvement to surface cleaning of all surrounding boundaries for ultrasonic cavitation cleaning and results in greater administration of noninvasive therapy and drug delivery.

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Bubbles in Non-Newtonian Fluids: A Multiscale Modeling

Abstract: and available online here Cet article fait partie du dossier thématique ci-dessous publié dans la revue OGST, Vol. 68, n°6, pp. 951-1113 et téléchargeable ici

Cited by 3 publications

References 32 publications

Bubble size distribution and gas holdup in bubble columns employing non‐Newtonian liquids: A CFD study

Bubble size distribution and gas holdup in bubble columns employing non‐Newtonian liquids: A CFD study

Numerical simulations of bubble behavior and mass transfer in CO 2 capture system with ionic liquids

The evolution of a three-dimensional microbubble at a corner in a Maxwell fluid

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