Effective velocity and effective dispersion coefficient for finite-sized
particles flowing in a uniform fractureEffective velocity and effective dispersion coefficient for finite-sized
particles flowing in a uniform fracture
Peer-Reviewed Journal Publication
Δημοσίευση σε Περιοδικό με Κριτές
2015-09-172003enIn this work we derive expressions for the effective velocity and effective dispersion coefficient for finite-sized spherical particles with
neutral buoyancy flowing within a water saturated fracture. We considered the miscible displacement of a fluid initially free of particles by
another fluid containing particles of finite size in suspension within a fracture formed by two semi-infinite parallel plates. Particle spreading
occurs due to the combined actions of molecular diffusion and the dispersive effect of the Poiseuille velocity profile. Unlike Taylor dispersion,
here the finite size of the particles is taken into account. It is shown that because the finite size of a particle excludes it from the slowest
moving portion of the velocity profile, the effective particle velocity is increased, while the overall particle dispersion is reduced. A similar
derivation applied to particles flowing in uniform tubes yields analogous results. The effective velocity and dispersion coefficient derived in
this work for particle transport in fractures with uniform aperture are unique and ideally suited for use in particle tracking models.http://creativecommons.org/licenses/by/4.0/Journal of Colloid and Interface Science2631288-295A45-JoCIS-03.pdfChania [Greece]Library of TUC2015-09-17application/pdf250.9 kBfree
Chrysikopoulos Constantinos
Χρυσικοπουλος Κωνσταντινος
Scott C. James