The effect of thixotropy on a rising gas bubble: A numerical study

Sadeghy, Kayvan; Vahabi, Mohammad

doi:10.1007/s13367-016-0021-8

Cited by 13 publications

(5 citation statements)

References 28 publications

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“…Furthermore, it has been conjectured that thixotropy could be the cause of the negative wake. However, Sadeghy and Vahabi [64] simulated the effect of thixotropy on a rising bubble and did not find a negative wake behind the bubble. Further, Arigo et al [52] and Vélez-Cordero et al [62] did not observe a negative wake experimentally for the Boger-type fluids, which have a constant viscosity.…”

Section: The Negative Wake Phenomenonmentioning

confidence: 96%

Review of Single Bubble Motion Characteristics Rising in Viscoelastic Liquids

Wang

2021

International Journal of Chemical Engineering

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The emphasis of this review is to discuss three peculiar phenomena of bubbles rising in viscoelastic fluids, namely, the formation of a cusp, negative wake, and velocity jump discontinuity, and to highlight the possible future directions of the subject. The mechanism and influencing factors of these three peculiar phenomena have been discussed in detail in this review. The evolution of the bubble shape is mainly related to the viscoelasticity of the fluid. However, the mechanisms of the two-dimensional cusp, tip-streaming, “blade-edge” tip, “fish-bone” tip, and the phenomenon of the tail breaking into two different threads, in some special viscoelastic fluids, are not understood clearly. The origin of the negative wake behind the bubbles rising in a viscoelastic fluid can be attributed to the synergistic effect of the liquid-phase viscoelasticity, and the bubbles are large enough; thus, leading to a very long relaxation time taken by the viscoelastic stresses. For the phenomenon of bubble velocity jump discontinuity, viscoelasticity is the most critical factor, and the cusp of the bubbles and the surface modifications play only ancillary roles. It has also been observed that a negative wake does not cause velocity jump discontinuity.

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Section: The Negative Wake Phenomenonmentioning

confidence: 96%

Review of Single Bubble Motion Characteristics Rising in Viscoelastic Liquids

Wang

2021

International Journal of Chemical Engineering

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“…In addition, the use of SPH to model thixotropic fluids can be found only in few studies: one related to free surface flow in dam-break applications [38] and the other related to the interfacial-flows in the ascent of bubbles in thixotropic materials e.g. [39].…”

Section: Some Of the Earliest Applications Of Smoothed Particle Hydro...mentioning

confidence: 99%

SPH simulations of thixo-viscoplastic fluid flow past a cylinder

Rossi¹,

Garcia‐Beristain²,

Vázquez-Quesada³

et al. 2022

Journal of Non-Newtonian Fluid Mechanics

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“…The SPH demonstrates its capabilities for multiphase flow simulations (Grenier et al , 2009; Aly, 2015; Fonty et al , 2019; Wang et al , 2020; Saghatchi et al , 2020; Rahmat and Yildiz, 2021). The performed simulations are not limited to Newtonian cases but include non-Newtonian ones (Ren et al , 2012; Zainali et al , 2013; Sadeghy and Vahabi, 2016). Based on the previous success of the SPH on similar problems, SPH is selected in this study for simulation drop deformation.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of drop deformation under simple shear flow of Giesekus fluids by SPH

Moinfar

Vahabi²,

Vahabi³

2022

HFF

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Purpose The purpose of this study is to investigate the effects of the shear-thinning viscoelastic behavior of the surrounding matrix on droplet deformation by weakly compressible smoothed particle hydrodynamics (WC-SPH). Also, the effect of the presence of another droplet is examined. Design/methodology/approach A modified consistent weakly compressible SPH method is proposed. After code verification, a complete parameter study is performed for a drop under the simple shear flow of a Giesekus liquid. The investigated parameters are 0.048≤Ca ≤ 14.4, 0.1≤c ≤ 10, 0.04≤De ≤ 10, 0≤α ≤ 1 and 0.12≤Re ≤ 12. Findings It is demonstrated that the rheological behavior of the surrounding fluid could dramatically affect the droplet deformation. It is shown that the droplet deformation is increased by increasing Re and Ca. In contrast, the droplet deformation is decreased by increasing a, De and polymer content. Also, it is indicated the presence of another droplet could drastically affect the flow field, and the primary stress difference (N1) is resonated between two droplets. Originality/value The main originality of this paper is to introduce a new consistent WC-SPH algorithm. The proposed method is very versatile for tackling the shear-thinning viscoelastic multiphase problems. Furthermore, a complete parameter study is performed for a drop under the simple shear flow of Giesekus liquid. Another novelty of the current paper is studying the effect of the presence of a second droplet. To the best of the authors’ knowledge, this is performed for the first time.

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The effect of thixotropy on a rising gas bubble: A numerical study

Cited by 13 publications

References 28 publications

Review of Single Bubble Motion Characteristics Rising in Viscoelastic Liquids

Review of Single Bubble Motion Characteristics Rising in Viscoelastic Liquids

SPH simulations of thixo-viscoplastic fluid flow past a cylinder

Numerical simulation of drop deformation under simple shear flow of Giesekus fluids by SPH

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