Predictive Modelling Of Particle Laden Turbulent Flows Quarterly Progress Report No 2 January 1 1993 March 31 1993

The excellent comparison between the data of Bader et al (1988) and the predictions using the fully-developed flow model of Sinclair and Jackson (1989) have not yet been repeated with any other experimental data set for riser flow. This may be due to the fact that the data sets investigated thus far have reflected gas-solid flow in a developing state (low L/D ratios). In addition, the model of Sinclair and Jackson (1989) neglected gas phase turbulence which should have an effect on the solid concentration distribution. Hence, a dilute, particle-laden, turbulent flow model is developed here. Model predictions highlight the importance of an independent measurement of the specularity factor, an appropriate representation of the kinetic contribution to the total particle phase stress for very low solid loadings in confined flows, and a correct representation of the interaction between the fluctuating velocity components for the two phases.