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Transport in Porous Media

, 76:289 | Cite as

Influence of Internal Structure and Medium Length on Transport and Deposition of Suspended Particles: A Laboratory Study

  • Nasre-Dine AhfirEmail author
  • Ahmed Benamar
  • Abdellah Alem
  • HuaQing Wang
Article

Abstract

A laboratory study was undertaken on the transport and the deposition of suspended particles (silt of modal diametre 6 µm) in three columns of different length, filled with glass beads or gravel. Tracer tests were carried out at various flow velocities by short pulses of a mixture of suspended particles/dissolved tracer. The breakthrough curves were competently described with the analytical solution of a convection dispersion equation with a first-order deposition rate and the hydro-dispersive parameters were deduced. For the same experimental conditions, the results showed a difference in the behaviour of the suspended particles transport and deposition rates within the two porous media tested. The internal structure of both media governs the particle-grain collision frequency as well as the particles trapping. The scale effect was highlighted and affects the dispersivity, the size exclusion effect, the recovery rates and the deposition rates. Longitudinal dispersion increases with mean pore velocity and is described with a nonlinear relationship. The dispersivity increases with the column length. The size exclusion effect is more important in the short column. The recovery rate increases with flow velocity and decreases while increasing column length. The deposition rates increases until a critical flow velocity then decreases. This critical velocity is also sensitive to the scale effect, and increases with the column length.

Keywords

Suspended particles Size exclusion effect Dispersivity Internal structure Deposition rate 

Nomenclature

Latin Symbols

C

Dissolved tracer/suspended particle concentration in solution

C0

Initial concentration

CR

Relative concentration, equals CV P/m

Cu

Uniformity coefficient

d50

Median grain size

D

Column inner diametre

D0

Molecular diffusion coefficient

DL

Longitudinal dispersion coefficient

K

Hydraulic conductivity

Kdep

The deposition rate coefficient

L

Column length

m

Masse of particle injected

Pe

Péclet number

Q

Flow rate

R

Recovery rate

t

Time

tc

Convection time

U

Darcy’s velocity

Ucr

Critical Darcy’s velocity

u

The average travel velocity of particles/dissolved tracer

ur

Relative velocity factor, equals (u SP − u T)/u T

uSP

The average travel velocity of suspended particles

uT

The average travel velocity of dissolved tracer

Vinj

Solute injected volume

VP

Pore volume of the porous medium

x

Travel distance (column length)

Greek Symbols

αL

Longitudinal dispersivity

δ(t)

Dirac function

β

A coefficient (in \({\alpha_{\rm L}=\kappa d_{50}^\beta}\))

κ

A constant (in \({\alpha_{\rm L}=\kappa d_{50}^\beta}\))

τ

tortuosity

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Nasre-Dine Ahfir
    • 1
    Email author
  • Ahmed Benamar
    • 1
  • Abdellah Alem
    • 1
  • HuaQing Wang
    • 1
  1. 1.Laboratoire d’Ondes et Milieux Complexes FRE - 3102 CNRSUniversité du HavreLe HavreFrance

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