The fluidization characteristics of a prototype-fluidized bed laboratory reactor were understudied in order to investigate the suitable conditions at which the dehydrogenation reaction of butane could be carried out. To achieve this, a reactor with an effective volume of 1100ml was fabricated and coupled with temperature and pressure accessories. Zeolites were obtained from the market and clay ...

Experiments were conducted in a liquid-solid circulating fluidized bed with different viscous liquids and particles to study the hydrodynamics, average solid hold up and solid circulation rate. The effects of operating parameters, i.e., primary liquid flow rate in the riser, auxiliary liquid flow rate, total liquid flow rate and viscosity of the liquid were studied for solids of different densi...

In this paper, a unified gas-kinetic wave-particle scheme (UGKWP) for the disperse dilute gas-particle multiphase flow is proposed. The gas phase always in hydrodynamic regime. However, particle covers different regimes from trajectory crossing to wave interaction with variation of local Knudsen number. UGKWP an appropriate method capturing multiscale transport mechanism through its coupled for...

The continuum theory-based models, which include solid stress models and gas-solid drag are required for the modeling of flows in framework Eulerian–Eulerian method. interactions among particles characterized by their diverse behaviors at different flow regimes, including kinetic motion, particle–particle collision enduring friction. It is difficult to describe particle various regimes mathemat...

A CFD-DEM model for aerated vibratory convection was developed to explore the coupled gas-solid interactions governing bulk powder bed dynamics. Each simulation prepared by carefully characterizing rough, porous conveyor baseplate and four candidate particle sizes representative of typical beds. Trends in particles between 20 250 μm diameter could be explained considering each powder's minimum ...

This study presents a new method to remove lignin from wheat straw (lignocellulosic) using the ozonation technique. Lignocellulosic material is complex biopolymer composed of cellulose, hemicellulose and lignin. Apart lignin, which acts as chemical resistant, lignocellulosic main resource cellulose sugars. The reaction takes place in two-phase solid–gas fluidization stainless steel reactor. foc...

A fluidized bed of Geldart-A particles is promoted as heat transfer fluid in the tubular solar receivers towers. pressure-driven upward particle flow affects hydrodynamic structure and properties bed. Experiments involved a tube 0.05 m internal diameter but very high height/diameter ratio (>120), representative future receiver numerous chemical reactors. Solid circulation fluxes aeration veloci...

We report initial NMR studies of gas dynamics in a particle bed fluidized by laser-polarized xenon (129Xe) gas. We have made preliminary measurements of two important characteristics: gas exchange between the bubble and emulsion phases and the gas velocity distribution in the bed. We used T2* contrast to differentiate the bubble and emulsion phases by choosing solid particles with large magneti...