Effect of fluid properties on dispersion in flow through packed beds

Authors

  • J. R. F. Guedes de Carvalho,

    Corresponding author
    1. Dept. de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, 4200-465 Porto, Portugal
    • Dept. de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, 4200-465 Porto, Portugal
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  • J. M. P. Q. Delgado

    1. Dept. de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, 4200-465 Porto, Portugal
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Abstract

An experimental study is described on the effect of liquid properties on axial dispersion in packed beds. Working with water between 278 and 373 K, the range 57<Sc<1,930 was covered, and this represents a significant fraction of the domain located between what is traditionally considered “gas behavior” (that is, Sc≅1) and “liquid behavior” (typically, Sc>600). A representation of PeL vs. Pem reveals the existence of a very flat minimum (typically 102<Pem<104) for each value of Sc. The value of the minimum is almost insensitive to variations in Sc, for Sc>700, but it increases significantly with a decrease in Sc, for Sc<700. The experimental data used to test available correlations for predicting DL show that they are inaccurate over considerable ranges of the variables.

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