Atypical plug formation in internal elastoviscoplastic fluid flows over non-smooth topologies

Villalba, Miguel E.; Daneshi, Masoud; Chaparian, Emad; Martinez, D. Mark

doi:10.1016/j.jnnfm.2023.105078

Journal of Non-Newtonian Fluid Mechanics

2023

DOI: 10.1016/j.jnnfm.2023.105078

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Atypical plug formation in internal elastoviscoplastic fluid flows over non-smooth topologies

Miguel E. Villalba

Masoud Daneshi

Emad Chaparian

et al.

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2024

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Cited by 3 publications

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General hydrodynamic features of elastoviscoplastic fluid flows through randomised porous media

Parvar,

Chaparian,

Tammisola

2024

Theor. Comput. Fluid Dyn.

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A numerical study of yield-stress fluids flowing in porous media is presented. The porous media is randomly constructed by non-overlapping mono-dispersed circular obstacles. Two class of rheological models are investigated: elastoviscoplastic fluids (i.e. Saramito model) and viscoplastic fluids (i.e. Bingham model). A wide range of practical Weissenberg and Bingham numbers is studied at three different levels of porosities of the media. The emphasis is on revealing some physical transport mechanisms of yield-stress fluids in porous media when the elastic behaviour of this kind of fluids is incorporated. Thus, computations of elastoviscoplastic fluids are performed and are compared with the viscoplastic fluid flow properties. At a constant Weissenberg number, the pressure drop increases both with the Bingham number and the solid volume fraction of obstacles. However, the effect of elasticity is less trivial. At low Bingham numbers, the pressure drop of an elastoviscoplastic fluid increases compared to a viscoplastic fluid, while at high Bingham numbers we observe drag reduction by elasticity. At the yield limit (i.e. infinitely large Bingham numbers), elasticity of the fluid systematically promotes yielding: elastic stresses help the fluid to overcome the yield stress resistance at smaller pressure gradients. We observe that elastic effects increase with both Weissenberg and Bingham numbers. In both cases, elastic effects finally make the elastoviscoplastic flow unsteady, which consequently can result in chaos and turbulence. Graphical abstract

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General hydrodynamic features of elastoviscoplastic fluid flows through randomised porous media

Parvar,

Chaparian,

Tammisola

2024

Theor. Comput. Fluid Dyn.

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Growth and static stability of bubble clouds in yield stress fluids

Daneshi,

Frigaard

2024

Journal of Non-Newtonian Fluid Mechanics

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Buoyant miscible viscoplastic injections

Faramarzi,

Akbari,

Taghavi

2024

Phys. Rev. Fluids

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Atypical plug formation in internal elastoviscoplastic fluid flows over non-smooth topologies

Cited by 3 publications

References 45 publications

General hydrodynamic features of elastoviscoplastic fluid flows through randomised porous media

General hydrodynamic features of elastoviscoplastic fluid flows through randomised porous media

Growth and static stability of bubble clouds in yield stress fluids

Buoyant miscible viscoplastic injections

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