Diameter-dependent dispersion in cylindrical bead packs

Eric Vandre, Robert S. Maier, Daniel M. Kroll, Alon McCormick, H. Ted Davis

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


It has recently been argued that longitudinal dispersion in cylindrical packed beds is enhanced due to radial heterogeneities in the porosity and resulting velocity field. In particular, it is predicted that the time scale to attain asymptotic dispersion in a packed bed of radius R is proportional to R2/DT, where DT is the transverse dispersion constant in a homogeneous beadpack, and that the asymptotic longitudinal dispersion constant increases with R/d, where d is the bead diameter. We have measured the asymptotic dispersion rates for packed beds with R/d = 9.5, 12.7, and 25.4 and find good qualitative agreement with the predicted dependence on R/d.

Original languageEnglish (US)
Pages (from-to)2024-2028
Number of pages5
JournalAIChE Journal
Issue number8
StatePublished - Aug 2008


  • Chromatography
  • Fluid mechanics
  • Separation techniques


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