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General hydrodynamic features of elastoviscoplastic fluid flows through randomised porous media
Saeed Parvar1, Emad Chaparian2, Outi Tammisola1
1SeRC and FLOW, Engineering Mechanics, KTH Royal Institute of Technology, 10044 Stockholm, Sweden.
Theoretical and Computational Fluid Dynamics
|August 2, 2024
Summary
This study numerically investigates yield-stress fluids in porous media. Elasticity in elastoviscoplastic fluids can reduce drag and promote yielding, potentially leading to unsteady flow and turbulence.
Area of Science:
- Fluid dynamics
- Rheology
- Porous media physics
Background:
- Yield-stress fluids exhibit complex flow behavior in porous media.
- Understanding the role of elasticity is crucial for predicting fluid transport.
Purpose of the Study:
- To numerically investigate the flow of elastoviscoplastic and viscoplastic fluids in porous media.
- To reveal physical transport mechanisms influenced by fluid elasticity.
- To compare the flow properties of elastoviscoplastic and viscoplastic fluids.
Main Methods:
- Numerical simulations of fluid flow in randomly constructed porous media.
- Investigation of Saramito (elastoviscoplastic) and Bingham (viscoplastic) models.
- Parametric study varying Weissenberg number, Bingham number, and porosity.
Main Results:
- Pressure drop increases with Bingham number and solid volume fraction.
- Elasticity can increase pressure drop at low Bingham numbers but reduce drag at high Bingham numbers.
- Elastic effects promote yielding and can lead to unsteady, potentially turbulent flow.
Conclusions:
- Fluid elasticity significantly alters yield-stress fluid flow in porous media.
- Elasticity plays a complex role, influencing pressure drop, drag, and flow stability.
- The findings have implications for understanding non-Newtonian fluid behavior in complex geometries.
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