Abstract
Velocity profiles and turbulence parameters were measured with a hot-wire anemometer in the voids of a packing of rhombohedrally arranged spheres. Data were taken at Reynolds numbers of 4780 and 7010, based on particle diameter and superficial velocity. Turbulence energy spectra showed that eddy shedding did not occur inside the packing voids. Eddy diffusivities in the voids were much smaller than either the radial or axial dispersion coefficients. Therefore the dispersion coefficients are not directly, related to the eddy diffusivity in the flow region. The mean voidage over the whole cross-sectional area of the packing was kept constant. Under these conditions, the mean velocity still showed a maximum value within 1·5 particle diameters from the wall. Comparison of the mean velocity profiles and spectra inside the voids with similar data determined downstream from the packing indicated that there is no simple correlation between them.
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