The role of small bubbles in gas–liquid mass transfer in stirred vessels and assessment of a two-fraction model for noncoalescent or moderately viscous liquids
A two-gas-fraction model previously tested with gas-phase residence time distribution tests was used to interpret experimental transient curves during K L a determinations made with a conventional dynamic method. Large bubbles are modelled by an axial dispersion model, whereas small bubbles are cons...
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| Published in | Chemical engineering science Vol. 62; no. 14; pp. 3767 - 3776 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Oxford
Elsevier Ltd
01.07.2007
Elsevier |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0009-2509 1873-4405 |
| DOI | 10.1016/j.ces.2007.03.024 |
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| Abstract | A two-gas-fraction model previously tested with gas-phase residence time distribution tests was used to interpret experimental transient curves during
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determinations made with a conventional dynamic method. Large bubbles are modelled by an axial dispersion model, whereas small bubbles are considered as perfectly mixed. The use of this two-gas-fraction model leads to a significant improvement in the fitting of the experimental curves. Furthermore, the analysis carried out suggested that what is actually observed during an experiment carried out with the dynamic method is the mass transfer of large bubbles only—even in the presence of a significant fraction of small bubbles. |
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| AbstractList | A two-gas-fraction model previously tested with gas-phase residence time distribution tests was used to interpret experimental transient curves during
K
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a
determinations made with a conventional dynamic method. Large bubbles are modelled by an axial dispersion model, whereas small bubbles are considered as perfectly mixed. The use of this two-gas-fraction model leads to a significant improvement in the fitting of the experimental curves. Furthermore, the analysis carried out suggested that what is actually observed during an experiment carried out with the dynamic method is the mass transfer of large bubbles only—even in the presence of a significant fraction of small bubbles. A two-gas-fraction model previously tested with gas-phase residence time distribution tests was used to interpret experimental transient curves during KLa determinations made with a conventional dynamic method. Large bubbles are modelled by an axial dispersion model, whereas small bubbles are considered as perfectly mixed. The use of this two-gas-fraction model leads to a significant improvement in the fitting of the experimental curves. Furthermore, the analysis carried out suggested that what is actually observed during an experiment carried out with the dynamic method is the mass transfer of large bubbles only-even in the presence of a significant fraction of small bubbles. |
| Author | Pinelli, D. |
| Author_xml | – sequence: 1 givenname: D. surname: Pinelli fullname: Pinelli, D. email: davide.pinelli@mail.ing.unibo.it organization: Department of Chemical Mining and Environmental Engineering, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy |
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| Cites_doi | 10.1002/bit.260190606 10.1016/0009-2509(94)00474-6 10.1002/bit.260331107 10.1016/0009-2509(95)00395-9 10.1016/S0009-2509(99)00343-7 10.1016/0300-9467(87)85003-7 10.1016/j.ces.2004.10.044 10.1080/00986447908935850 10.1016/0300-9467(91)85026-R 10.1016/0009-2509(92)80318-7 10.1016/S0009-2509(02)00682-6 10.1002/bit.260220912 10.1205/cherd.04122 10.1016/0009-2509(92)85066-K 10.1002/aic.690380705 |
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| Keywords | Two-bubble-size fraction model Stirred vessel Dynamic measuring technique Bubble size effect Mass transfer Viscous liquid Particle size Residence time distribution Axial mixing Modeling Dynamic method Bubble Size effect |
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K
L
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| SubjectTerms | Applied sciences Bubble size effect Chemical engineering Dynamic measuring technique Exact sciences and technology Heat and mass transfer. Packings, plates Mass transfer Mixing Stirred vessel Two-bubble-size fraction model |
| Title | The role of small bubbles in gas–liquid mass transfer in stirred vessels and assessment of a two-fraction model for noncoalescent or moderately viscous liquids |
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