Dispersion of inert solutes in spatially periodic,two-dimensional model porous media |
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Authors: | D A Edwards M Shapiro H Brenner M Shapira |
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Institution: | (1) Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, 32000 Haifa, Israel |
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Abstract: | Taylor dispersion of a passive solute within a fluid flowing through a porous medium is characterized by an effective or Darcy scale, transversely isotropic dispersitivity
, which depends upon the geometrical microstructure, mean fluid velocity, and physicochemical properties of the system. The longitudinal,
and lateral,
dispersivity components for two-dimensional, spatially periodic arrays of circular cylinders are here calculated by finite element techniques. The effects of bed voidage, packing arrangement, and microscale Péclet and Reynolds numbers upon these dispersivities are systematically investigated.The longitudinal dispersivity component is found to increase with the microscale Péclet number at a rate less than Pe2. This accords with previous calculations by Eidsath et al. (1983), although the latter calculations were found to yield significantly lower longitudinal dispersivities than those obtained with the present numerical scheme. With increasing Péclet number, a Pe2 dependence is, however, approached asymptotically, particularly for square cylindrical arrays - owing to the creation of a linear streamline zone between cylinders. |
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Keywords: | Convective dispersion arrays of cylinders finite-element solution coarse-scale transport coefficients solute diffusivity |
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