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Interphase mass transfer in an aggregative fluidized bed

✍ Scribed by S.P. Sit; J.R. Grace

Publisher: Elsevier Science
Year: 1978
Tongue: English
Weight: 710 KB
Volume: 33
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(78)85017-9

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✦ Synopsis

Ab experunental techmque developed by Chavane and Grace has been used to measure Interphase mass transfer rates for bubbles m a two-dlmenslonal flmdlzed bed with different sizes of parkles from 90 to 39Opm It IS shown that the overall transfer rate, corrected for bubble growth and with neghsble effects of adsorption, increases \Irlth parWe dmmeter The best model for the smgle bubble case assumes that transfer IS contiolled by dlffuslon and convecuon at the bubble mterface, gven by the penetration theory and by Murray's theory respectively Agreement between this model and the data IS best d corrections for bubble shape are appbed and d It IS assumed that there 1s no mteracuon between the two transfer mechamsms Measurements of tracer concentrations as bubbles undergo coalescence Indicate that there may be semi enhancement of transfer due to bubble mteractron, hut tins does not appear to be a major factor for the condlhons studled

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