Results 51 to 60 of about 116 (112)
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The expansion of gas-fluidised beds in bubbling fluidisation
Chemical Engineering Science, 1997The expansion of gas-fluidised beds has been examined in the range of Archimedes number from 100 to 105 using five grades of glass ballotini and two grades of lead shot of narrow size distribution, and Diakon particles of wide size distribution. A porous plastic distributor plate was used in beds of diameters 89 and 290 mm.
D.J. Gunn, N. Hilal
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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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Bubble distribution and behaviour in bubbling fluidised beds
Chemical Engineering Science, 2007Abstract Bubble spatial distribution is a prime determinant of the process properties within a fluidised bed, and is coupled to and governed by the flow supply. Bubbles induce heterogeneity and the gas within them rises through the bed without much interaction with other phases.
Lim, CN, Gilbertson, MA, Harrison, AJL
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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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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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Effect of bed material on ammonia dissociation in a bubbling fluidised bed
International Journal of Hydrogen EnergyJianbo Li, Dongke Zhang
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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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The expansion of bubbling fluidised beds
Powder Technology, 1968Abstract The expansion of freely bubbling gas fluidised beds has been investigated experimentally in a 12-in. diameter bed and the influence of bed depth, gas velocity, particle size and particle-size distribution has been studied. Results are compared with theoretical predictions and new light is thrown on the assumptions inherent in the two-phase ...
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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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