Velocity of Single Coarse Particle in Upward Water Flow in Vertical Pipe.

Abstract

A model to calculate the velocity of single coarse particles in upward water flows in vertical pipes has been proposed in this paper. The model is based on the well-known drift flux model. In order to obtain both the correlations of the distribution parameter and the mean relative velocity required in the model, radial passage and velocity profiles of a single particle in upward water flow in a vertical pipe, 40 mm i. d., have been studied experimentally. In the experiment, six test particles of different size (2 to 10 mm), density (2540 to 7850 kg/m3) and shape (sphere, cube and cylinder) were used. The mean water velocity was varied up to 2.0m/s. The proposed model has been tested against the data of Toda et al., together with the present data, for different particle-pipe diameter combinations. Good agreement is obtained between the data and the calculations.