(139a) A Unified Theory for the Solid Stresses in Particle Laden Flow

An improved model describing the solid stresses in particle laden flow is presented. The model is shown to be valid for slow and intermediate flows and is developed based on the theory originally proposed by Tardos et al. [Powder Technol. 131 (2003) 23]. The study is an extension of the work proposed by Makkawi et al. [Powder Technol. 163 (2006) 69], where a steady one-dimensional particle flow model was used to demonstrate the smooth merge of quasi-static flow with “liquid-like” behaviour. In this study, the concept is further developed and extended to develop a general three dimensional constitutive model. The model is applied to simulate a bubbling fluidised bed and it is validated using experimental data obtained by electrical capacitance tomography (ECT) measurements.