Results 61 to 70 of about 116 (112)
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Measurement and simulation of bubbling fluidised beds
Powder Technology, 2006Abstract The effective control of systems requires the formulation of suitably robust models of their behaviour. The work described in this paper describes the simulation and modelling of the behaviour of a bubbling fluidised bed. A simple system is investigated consisting of a vertical planar bed.
Lim, CN, Gilbertson, MA, Harrison, AJL
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The distribution of bubbles in a gas fluidised bed
Chemical Engineering Science, 1970Abstract based on the observed pattern of coalescence of bubble pairs in vertical alignment in a two-dimensional bed, a theory is developed which describes how bubble size and frequency changes with height in gas fluidised bed. It is confirmed by comparison with the reported data from 10 separate investigations which can together be described by ...
R. Matsuno, P.N. Rowe
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Mechanistic Prediction of Bubble Properties in Freely-Bubbling Fluidised Beds
1980The approach developed by Nguyen et al.(1975) for predicting bubble behaviour in beds of Geldart’s (1973) Group B particles has been modified to enable application to beds of larger scale. The predictions are generally in agreement with the measurements of Werther (1974), but some discrepancy arises from non-uniform bubble formation caused by solids ...
Farrokhalaee, T, Clift, R
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Prediction of bubble size in a gas-fluidised bed
Chemical Engineering Science, 1976Abstract It is shown that existing data on bubble size (when this is not restricted by the vessel dimensions) can be described by where (U — Umf) is the excess gas flow, h is the height above the distributor and h0, a measure of the initial bubble size, characterises the distributor.
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Dynamic modelling of fluidisation in gas-solid bubbling fluidised beds
Powder Technology, 2017Abstract Formation of fluidised bubbles in a fluidised bed has significant impact on the design and scale-up of the bubbling fluidised bed. To fully understand bubble motions in the fluidised bed, fluidised bubble dynamics in a gas-solid fluidised bed is investigated using CFD-DEM numerical simulation.
Luming Chen +6 more
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Bubble formation in dense fluidized beds
Physics of Fluids A: Fluid Dynamics, 1991It has been known for a long time that fluidized beds of solid powder in gas may become unstable for certain values of relative and mass fraction, and that this behavior is important in determining the mixing properties of the bed. Several different mechanisms have been proposed for this instability, but no broad consensus is available on which are the
Juan A. Hernández, Javier Jiménez
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Combustion of polymer pellets in a bubbling fluidised bed
Combustion and Flame, 2011Abstract Single pellets (≈3 mm diameter) of high density polyethylene (HDPE) have been burned in an electrically heated bed of silica sand, fluidised by air or mixtures of N2 and O2 at atmospheric pressure. During the combustion of single pellets, measurements were made of the concentrations of CO and CO2 in the off-gas, enabling burnout-times to be ...
F. Burgess +3 more
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Solids motion in bubbling gas fluidised beds
Chemical Engineering Science, 2000Abstract Gas fluidised beds are widely employed in the chemical, petrochemical, metallurgical, and pharmaceutical industries. Solids mixing in such devices plays a central role in controlling product quality and productivity. This paper presents some observations of particle motion in 3-D gas fluidised beds operated in the bubbling mode and at ...
M Stein +3 more
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An x-ray study of bubbles in fluidised beds
Chemical Engineering Research and Design, 1997Synopsis Gas-fluidised beds are characterised by the formation of bubbles which rise through them and determine the pattern of particle movement and gas flow within. The basic nature and shape of the bubbles are of interest not only in predicting the overall behaviour of the bed (from a gas-solids contacting point of view, for example) but also when ...
P.N. Rowe, B.A. Partridge
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Bubble interaction in fluidised beds.
1970This item was digitized as part of a project to share McGill's intellectual legacy with the public. If you are the copyright holder or a relative of the copyright holder who is deceased, you may request withdrawal by emailing escholarship.library@mcgill.ca.
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