| Macromixing hydrodynamic study in draft-tube airlift reactors using electrical resistance tomography. | |
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MedLine Citation:
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PMID: 20661591 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The present study summarizes results of mixing characteristics in a draft tube airlift bioreactor using ERT. This technique offers the possibility for noninvasive and nonintrusive visualization of flow fields in the bioreactor and has rarely been utilized previously to analyze operating parameters and mixing characteristics in this type of bioreactors. Several operating parameters and geometric characteristics were examined. In general, results showed that the increase in superficial gas velocity corresponds to an increase in energy applied and thus, to a decrease in mixing time. This generally corresponded to an increase in liquid circulation velocity and shear rate values. Bottom clearances and draft tube diameters affected flow resistance and frictional losses. The influence of sparger configurations on mixing time and liquid circulation velocity was significant due to their effect on gas distribution. However, the effect of sparger configuration on shear rate was not significant, with 20% reduction in shear rates using the cross-shaped sparger. Fluid viscosity showed a marked influence on both mixing times and circulation velocity especially in the coalescing media of sugar and xanthan gum (XG) solutions. Results from this work will help to develop a clear pattern for operation and mixing that can help to improve several industrial processes, especially the ones related to emerging fields of technology such as the biotechnology industry. |
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Authors:
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Farouza Gumery; Farhad Ein-Mozaffari; Yaser Dahman |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-27 |
Journal Detail:
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Title: Bioprocess and biosystems engineering Volume: 34 ISSN: 1615-7605 ISO Abbreviation: Bioprocess Biosyst Eng Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-01-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101088505 Medline TA: Bioprocess Biosyst Eng Country: Germany |
Other Details:
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Languages: eng Pagination: 135-44 Citation Subset: IM |
Affiliation:
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Department of Chemical Engineering, Ryerson University, Toronto, Ontario, Canada. |
Export Citation:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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