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Particle-fluid heat transfer and dispersion in fluidised beds

✍ Scribed by D.J. Gunn; P.V. Narayanan

Publisher: Elsevier Science
Year: 1981
Tongue: English
Weight: 724 KB
Volume: 36
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(81)80038-3

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✦ Synopsis

The dynamic response of a gas fluidised bed has been measured for a range of particle sizes of lead glass ballotini and a range of particle Reynolds numbers. A dispersion model has been formulated that includes the effects of gas and particle mixing,fluid-to-particle heat transfer and intraparticle thermalconductivity,and the dynamic thermal response in theory has been found by solving the partial differential equations in the Laplace transform domain. The coefficient of thermal dispersion, the particle-to-fluid heat transfer coefficient and the intraparticle thermal conductivity have been found for the experimental response by non-linear regression. The coefficient of axial dispersion wasfoundtobelargeand theparticle tofluidheattransfercoefficientsagreedwithanestablished correlationforfixedand fluidisedbeds.Theintraparticlethermalconductivityagreed withliteraturevaluesforleadglass,theestimatesshowedno trend with flowrate, and the standard deviation of the estimate was three times smaller than the deviation found from similar experiments in fixed beds.

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