Journal
TRANSPORT IN POROUS MEDIA
Volume 137, Issue 1, Pages 63-86Publisher
SPRINGER
DOI: 10.1007/s11242-021-01544-y
Keywords
Apparent viscosity; Shear-thinning; Viscoelastic thickening; Porous media; Lattice Boltzmann method
Categories
Funding
- Chemical EOR Industrial Affiliates Project in the Center for Subsurface Energy and the Environment (CSEE)
Ask authors/readers for more resources
By using a lattice Boltzmann model, the flow of thinning-elastic fluids through porous media was simulated successfully, capturing both their viscoelastic and shear-thinning behaviors accurately. The model was verified against analytical solutions, and the thickening effect of the viscoelastic fluid was found to be more prominent in porous geometries with a large pore-throat ratio.
Many non-Newtonian fluids, including polymers, exhibit both shear-thinning and viscoelastic rheological properties. A lattice Boltzmann (LB) model is developed for simulation of the flow of thinning-elastic fluids through porous media. This model applies the Oldroyd-B constitutive equation and the Carreau model, respectively, to account for the viscoelastic and shear-thinning behaviors of the thinning-elastic fluid in porous media. Both rheological features are captured well by this model and are verified against analytical solutions. The thinning-then-thickening viscosity curve of the thinning-elastic fluid observed in experiments is reproduced by the present pore-scale simulations. In addition to the traditional extensional theory, we propose other important mechanisms for the increase in apparent viscosity of viscoelastic fluids at higher shear rates. The mechanisms proposed include the reduction in conductivity due to stagnant fluid, the compressed effective flow region, and larger energy dissipations caused by the viscoelastic instability. We find that the viscoelastic thickening effect is more prominent in porous geometries with a large pore-throat ratio.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available