Results 151 to 160 of about 215 (211)
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Characteristics of fluidisation behaviour in a pressurised bubbling fluidised bed
The Canadian Journal of Chemical Engineering, 2012AbstractThe experiments were carried out in a bench‐scale fluidised bed of 90 mm in diameter to determine the influence of pressure on fluidisation characteristics of Geldart A and B particles over the range of pressure 0.1–4.5 MPa. For Geldart B particles, the results indicate that minimum fluidisation velocity (umf) was found to decrease with ...
Haoyu Li +3 more
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Bubble velocities and bed expansions in freely bubbling fluidised beds
Chemical Engineering Science, 1969Abstract Measurements of bubble velocities in freely bubbling beds have shown that the velocities of individual bubbles are influenced more markedly by the disposition of surrounding bubbles than by the size of the individual bubble itself. Bubbles present in high concentration rise at much greater velocities than isolated bubbles of the same volume.
K. Godard, J.F. Richardson
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The behaviour of a continuously bubbling fluidised bed
Chemical Engineering Science, 1966Abstract This paper considers two aspects of the behaviour of a bubbling fluidised bed, namely (a) How is the rising velocity of a bubble in a cloud of bubbles related to the velocity of the same bubble in complete isolation? This is important in the consideration of the expansion of a bed of particles due to bubbles rising through it.
J.F. Davidson, D. Harrison
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Control of the state of a bubbling fluidised bed
Chemical Engineering Science, 2006Bubbling fluidised beds are used for a wide variety of industrial processes. As such it is desirable to be able to specify the conditions within the bed. These conditions can be subject to unwanted change in areas such as feedstock or fluctuations in process settings such as gas flow.
Croxford, AJ, Gilbertson, MA
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The behaviour of freely bubbling fluidised beds
Chemical Engineering Science, 1969Abstract This paper considers two aspects of the behaviour of freely bubbling fluidised beds: 1. The rising velocity of bubbles in a fluidised bed has been found to be greater for a swarm of bubbles than for a bubble in isolation. This appears to be caused primarily by the acceleration of overtaking bubbles during the coalescence process.
J.R. Grace, D. Harrison
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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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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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Bubbling Properties in Pulsed Fluidised Beds
2021This chapter discusses the response of flow patterns and bubbling properties in a quasi-2D, pulsed, gas-solid bubbling fluidised bed to the variations in an oscillatory gas flow. The experimental results demonstrate that bubbling behaviour can be modified via modulated periodic flows.
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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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