L.G. Gibilaro

TL;DR: In this paper, the pressure drop correlation was proposed on the basis of theoretical considerations and compared with published experimental results obtained from high voidage fixed beds of spheres and is shown to represent a significant improvement over the established Ergun equation, which is used to produce drag coefficient correlations for individual particles in the bed which in turn yield a general and fully predictive expression for the drag force on a particle in a fluidized suspension.

TL;DR: In this article, a simple general model for the interaction between a particle and the fluid in a fluidized suspension, enables a hydrodynamic criterion for the onset of bubbling in fluidized beds to be formulated in a compact and fully predictive form.

TL;DR: In this paper, a model is derived for a fluidized bed that enables its steady state particulate expansion to be predicted as a function of superficial velocity from the initial (packed bed) condition to the final fully expanded (single suspended particle) state.

TL;DR: In this paper, a differential equation model is derived to describe particle segregation in a binary mixture of solids fluidized by gas, which is formulated to conform with qualitative descriptions of the mechanism of segregation, yields solutions displaying the unusual features of the steady state solids-concentration profiles found experimentally and enables appraisals to be made of the relative importance of the contributary mechanisms.

TL;DR: In this paper, the equations of change for a fluidised suspension are closed by application of a simple model for the interaction of a single particle with the fluid; this relationship delivers the total force on elements of the particle phase including a fluid dynamic formulation for the'particle phase pressure gradient '; numerical solutions of the non-linear equations, for small imposed perturbations of voidage, show clearly the development of shocks (bubbles) for unstable (aggregate) beds and the return to the homogeneous state for stable (particulate) systems.