Abstract
Numerical simulations of isothermal turbulent gas-solid flow in the riser of a pilot-scale
circulating fluidised bed reactor has been carried out using FLUENT CFD software. An
Eulerian-Eulerian multiphase flow model was used. The constitutive equations in terms of
the granular temperature based on the kinetic theory of granular flow are used to
determine the solids pressure, shear and bulk viscosity. The granular temperature is
determined using both the algebraic and differential transport models. The kε model is
used for the gas phase turbulence. The predicted particle velocity and concentration are
compared with experimental data collected by Huang et al 1 in a riser of 15.1 m in height
and 0.10 m in diameter with particles of 67 μm mean diameter. In general, the measured
trends are well predicted by both the models of granular temperature. However, the
predictions obtained using the differential transport model for the granular temperature
are in a better agreement with data compared with those obtained using the algebraic
model.