Conference Dates

July 1-6, 2007

First Page



In the present work, the flow in the radial-flow cell was analyzed for an aspect ratio of 1 with inlet pipe Reynolds numbers of 950, 2 000 and 4 100. Two models were applied to compute the wall shear stress distribution at the lower surface, at any distance from the center. Stainless steel and polystyrene surfaces were soiled with oil and starch and the detachment of these soils was assessed by measuring the detachment radius in a radial-flow cell. The experimental radii were introduced in the models and converted into wall shear stress. Comparisons of the various sets of data suggest that soil removal was not controlled by wall shear stress alone. Satisfactory estimations of the wall shear stress could be obtained at low radial positions for laminar flow, pointing out the usefulness of CFD for the computation of the critical wall shear stress when soil removal occurs in this region