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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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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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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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On bubble flow in liquids and fluidised beds
Chemical Engineering Science, 1966Abstract An illustration of Nicklin's conclusions for two-phase flow is given, and application of these conclusions is made to the two-phase theory of fluidised beds. Some expressions previously derived for fluidised beds are believed now to require re-consideration.
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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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The combustion of polymer pellets in a bubbling fluidised bed
Fuel, 2006Wastes burned in incinerators usually contain polymers, whose combustion can be associated with noxious emissions, unless the conditions are properly selected. This paper investigates how polymers burn in a fluidised bed; in fact, the combustion of a number of polymers, including several types of polyethylene, polystyrene and a polyamide, was studied ...
J. Baron +5 more
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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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The Bubble Phase in High-Pressure Fluidised Beds
1980The slugging/bubbling behaviour of a wide-size range of powders has been investigated at gas pressures up to 25 bar in a 0.1 m diameter fluidised bed, by X-ray photography of slugs within the system and by direct observation of the bed surface.
D. F. King, D. Harrison
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Modelling of bubbling fluidised bed coal gasifiers
Fuel, 1999A previous numerical model of fluidised-bed coal gasifiers has been further improved to incorporate an overall energy balance. The improved model has been used to simulate the performance of bubbling fluidised-bed coal gasifiers of different scales.
Yan, Hongming +2 more
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Gas flow through a bubble in a fluidised bed
Chemical Engineering Science, 1972By considering the equations of motion for gas and particle flow around a bubble in a fluidised bed, it is shown that the direction of the radial gas velocity component changes at θ = cos−1 (23). Thus all the gas flow out of the bubble occurs over the front region of the bubble contained by this angle.
J.H. Hargreaves, D.L. Pyle
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