Study of the hydraulic gradient of slurry flow containing mixed size particles in a horizontal pipeline.

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概要

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• The hydraulic gradient in slurry transportation has been practically discussing with the data on the single size particles. However, the most economic conditions are obtained in the case of the slurries mixed of different size particles. While the Wasp's method has been comprehensively used for prediction of hydraulic gradient on the slurries containing various size particles, the authors had already pointed out that the method should provide sufficiently accurate predictions for the hydraulic gradient under the limited transport conditions.<BR>In this paper, the size distribution of materials were estimated with the distribution constant n and basic constant b associated with the specified residue, Rosin-Rammlar's distribution law and median size diameter d<SUB>50</SUB>, and the influence of size distribution on the hydraulic gradient in systems were investigated analytically. Moreover, experiments to ascertain the results of the analytical studies were performed using sand particles, whose size laid between 0.42 and 2.83 mm, in transparent plastic recirculating pipeline loops with 25.9 and 31.9 mm diameter.<BR>The principal results of this study may be summarised as follows:<BR>(1) As the distribution constant n deceases at a given basic constant b, the hydraulic gradient decreases at lower mean velocities, whereas it increases at high velocities.<BR>(2) The effect of n value on the hydraulic gradient is dependent not on the pipe diameter and delivered volume concentration, but highly on the median size diameter d<SUB>50</SUB>.<BR>(3) The exponent in Durand-Condolios equation for the nonuniform solids tend to be lower than the one for the uniform solids if the median size diameter is selected as the representative diameter of solids of distributed size.

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