Dynamics of double emulsion interfaces under the combined effects of electric field and shear flow

Saghatchi, Roozbeh; Özbulut, Murat; Yıldız, Mehmet

doi:10.1007/s00466-021-02045-x

Cited by 12 publications

(5 citation statements)

References 60 publications

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“…Numerical integration of equations 20, 23–25 is performed concerning time in a predictor–corrector scheme. Between the predicting and correction, particles are shifted slightly to avoid clustering (Xu et al , 2009; Khayyer et al , 2016; Saghatchi et al , 2021): …”

Section: Numerical Approachmentioning

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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Section: Numerical Approachmentioning

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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“…Many challenging fluid and solid mechanics related problems have been successfully handled with the SPH methods, which for instance include free surface flows, [18][19][20] nano- 21 and bio-heat transfer, 22 multi-phase flow, 23 electrohydrodynamics (EHD), [24][25][26] among others. However, to the best of our knowledge, an attempt for simulating active nematics with the SPH method has not been realized to date.…”

Section: Introductionmentioning

confidence: 99%

Development of smoothed particle hydrodynamics method for modeling active nematics

Saghatchi

Kolukısa

Yıldız

2022

Numerical Meth Engineering

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This article proposes a novel graphics processing unit‐based active nematic flow solver based on the smoothed particle hydrodynamics (SPH) method. Nematohydrodynamics equations are discretized using the SPH algorithm. Flow behavior, nematic ordering, topological defects, and vorticity correlation are calculated and discussed in detail. The spectrum of the kinetic energy with respect to the wavenumber is calculated at high particle resolution, and its slope at the different length scales is discussed. To exploit the SPH capabilities, pathlines of nematic particles are evaluated during the simulation. Finally, the mixing behavior of the active nematics is calculated as well and described qualitatively. The effects of two important parameters, namely, activity and elastic constant are investigated. It is shown that the activity intensifies the chaotic mixing nature of the active nematics, while the elastic constant behaves oppositely.

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“…Smoothed particle hydrodynamics (SPH) is one of the most widely utilized meshfree computational approaches for modeling diverse physical fluid flow conditions [30][31][32][33][34]. He et al [32] developed a coupled weakly compressible and total Lagrangian SPH (WC-TL SPH) approach to model the interactions of elastic entities with free-surface flows.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of the Energy Efficiency Enhancement of Oscillating Water Column Wave Energy Converter Systems

2022

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This work focuses on the geometry effects over the performance of oscillating water column (OWC)-type wave energy converter (WEC) systems and searches for the OWC geometries that enhance the energy efficiencies under the same wave conditions. To analyze the hydrodynamic performances of the WEC systems, an in-house smoothed particle hydrodynamics (SPH) code based on weakly compressible fluid approach is utilized. The energy efficiency enhancement studies of the determined OWC device are carried out with a two-step geometry modification procedure. The first step starts with the validation of the free-surface elevation and orbital velocity time histories. Then, a three-by-three simulation matrix that depends on the geometrical design parameters of chamber length and front wall draft is run at three different wave conditions, and the OWC geometry that produces the maximum energy efficiency is determined. In the second step, the corner regions of the obtained optimal geometry are chamfered, and another simulation matrix is tested at the wave condition that yields maximum wave energy. It is observed in this step that the energy efficiency index can still be improved by 4.3% by only chamfering the back face of the OWC chamber. To scrutinize the physical grounds of this increase, the correlation between the time-averaged vorticity and energy efficiency is presented. Finally, the performance of the best configuration is also examined in three different wave periods, where the suggested geometry shows better performance with respect to base geometry results in all wave conditions.

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Dynamics of double emulsion interfaces under the combined effects of electric field and shear flow

Cited by 12 publications

References 60 publications

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

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

Development of smoothed particle hydrodynamics method for modeling active nematics

A Numerical Investigation of the Energy Efficiency Enhancement of Oscillating Water Column Wave Energy Converter Systems

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