Numerical simulation of retention and release of colloids in porous media at the pore scale
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Citations
Slow migration of mobilised fines during flow in reservoir rocks: Laboratory study
Particle mobilization in porous media: Temperature effects on competing electrostatic and drag forces
Mathematical modelling of fines migration in geothermal reservoirs
Slow migration of detached fine particles over rock surface in porous media
Fines migration in geothermal reservoirs: laboratory and mathematical modelling
References
Hydrodynamic particle removal from surfaces
A mathematical model for non-monotonic deposition profiles in deep bed filtration systems
Pore-scale observation of microsphere deposition at grain-to-grain contacts over assemblage-scale porous media domains using X-ray microtomography.
DLVO interaction energy between a sphere and a nano-patterned plate
Hysteresis of Colloid Retention and Release in Saturated Porous Media During Transients in Solution Chemistry
Related Papers (5)
Flow of Suspensions through Porous Media—Application to Deep Filtration
Frequently Asked Questions (15)
Q2. What are the important phenomena that should be considered in interpreting field and laboratory data?
It is admitted that besides porous media structure, transport and chemical aspects are the most important phenomena that should be considered in interpreting field and laboratory data or in analyzing modeling results.
Q3. What is the effect of DLVO forces on the particle?
The existence of DLVO forces at short separation distances, with high intensities can lead to large particle velocities and therefore very small time steps.
Q4. What are the hydrodynamic forces that can be computed?
When the particle–grain or particle–particle distance is less than a grid size, hydrodynamic forces cannot be computed correctly.
Q5. What is the particle-pore interaction potential for a low ionic strength?
for a low ionic strength, the particle–pore surface interaction potential presents a significant energy barrier prohibiting the particle to come in close contact with the solid surface and is pushed away from the surface.
Q6. What are the physicochemical interactions between particles and a grain surface?
Physicochemical interactions between particles or a particle and a grain surface include van der Waals (vdW) and electrical double layer (DL) forces, the sum of which is called the DLVO force (DLVO).
Q7. how many simulations are needed to validate the analysis?
Additional simulations for constant ionic strength of the suspending fluid and various values of Reynolds number must be performed in order to fully validate the analysis.
Q8. how long does the simulation take to be representative of real experiments?
As a long-term perspective and to be representative of real experiments, simulations should also be carried out using a given distribution of true 3D roughness since the characteristic length of the topography (the wave length) is expected to play a major role both in particle retention and release.
Q9. What mechanism is used to re-enter the particles?
Similarly colloid particles may be re-entrained by escaping from these retention regions going back to the bulk flowing suspension (re-suspension mechanism).
Q10. What is the normal component of the force involved in particle contact with the wall?
The normal component of this force which is involved in particle contact with the wall is written as:Flub.n = −6 ap[ s(εh) − s(εh0 )]vp.n for h ≤ h0 (12)where εh = h/ap is a dimensionless surface-to-surface distance between neighboring particles or between a particle and a grain surface, εh0 = h0/ap, is the dimensionless critical distance for activation or deactivation of lubrication, vp is the particle velocity, n is the normal unit vector directed from the particle towards the plane or another particle and s is the Stokes correction (amplification) factor.
Q11. What is the extent of the interaction between a colloidal particle and a solid surface?
The extent of this interaction depends mainly on the asperities characteristic height H, their form and the inter-asperities distance relative to particle size.
Q12. How is the particle allowed to approach the solid surface?
Again by increasing the ionic strength both the energy barrier height and its distance range are reduced and the particle is allowed to approach the solid surface more closely.
Q13. What are the forces of a particle near an infinite flat plate?
For the case of a spherical particle near an homogeneous infinite flat plate (smooth grain surface in their case), the approximate analytical expressions of these forces denoted respectively FSPvdW, F SP DL and F SP DLVO are given by Prieve and Ruckenstein [36]:FSPvdW = − 2AHa3P3h2(h + ap)2 (6)FSPDL = 2 ε0εrap 1 − e−2 h (2 P Se − h − ( 2P + 2S )e−2 h) (7)FSPDLVO = FSPvdW + FSPDL (8) where AH is the particle/water/solid Hamaker constant; h is the minimum separation distance between the particle and the flat plate; is the inverse Debye screening length; ε0 is the dielectric permittivity of vacuum; εr is the relative dielectric constant of water and P and S are the surface zeta potentials of the particle and the grain respectively.
Q14. What are the main factors that were emphasized in the study?
Among them, the predominant role of the secondary minimum in the adsorption process was emphasized [2–4] and it was shown that on the basis of this, the influence of physicochemical parameters as ionic strength and pH of the background solution were well predicted [2].
Q15. What is the effect of the valley form on the flow structure?
It is worth noting that under the same conditions, less flow perturbation is noticed by decreasing the peak height as expected (data not shown) but such a perturbation is strongly changed when the valley form is considered.