Get access
Advertisement

Mechanics of column beds: II. Modeling of coupled stress-strain-flow behavior

Authors

  • Bee Gaik Yew,

    1. Dept. of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN, 37996
    2. Div. of Chemical and Analytical Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831
    Current affiliation:
    1. GZA GeoEnvironmental Inc., One Edgewater, Drive, Norwood, MA 02062
    Search for more papers by this author
  • Jorge Ureta,

    1. Dept. of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN, 37996
    2. Div. of Chemical and Analytical Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831
    Search for more papers by this author
  • R. Andrew Shalliker,

    1. Center for Biostructural and Biomolecular Research, University of Western Sydney, Richmond, NSW, 1797 Australia
    Search for more papers by this author
  • Eric C. Drumm,

    1. Dept. of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN, 37996
    Search for more papers by this author
  • Georges Guiochon

    Corresponding author
    1. Div. of Chemical and Analytical Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831
    2. Dept. of Chemistry, The University of Tennessee, Knoxville, TN, 37996
    • Div. of Chemical and Analytical Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831 and Dept. of Chemistry, The University of Tennessee, Knoxville, TN, 37996
    Search for more papers by this author

Abstract

The rheological behavior of a bed of packing material during its consolidation was investigated using an elastic-plastic model, the Frictional Material Model. This model takes into account the behavior of the packing material under compression stress, its consolidation, its internal friction, its friction against the column wall, and the dependence of the bed's permeability on the local void fraction. The complexity of the problem arises from the nonlinear behavior of the relationships between the critical parameters controlling the column bed behavior and the external stresses applied to this bed. Solutions of the model were calculated for combinations of axial compression and seepage stresses, the latter corresponding to the flow of the mobile-phase stream under typical conditions used in HPLC. The results demonstrate the importance of the internal angle of friction of the packing material used on the degree of radial and axial heterogeneity of the beds of chromatographic columns packed with this material.

Get access to the full text of this article

Ancillary