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Oxygen transfer in three scales of concentric tube airlift bioreactors

Paper ID Volume ID Publish Year Pages File Format Full-Text
3930 199 2010 8 PDF Available
Title
Oxygen transfer in three scales of concentric tube airlift bioreactors
Abstract

Oxygen transfer was evaluated in three internal-loop airlift reactors (ALRs) of different working volumes (2, 5, and 10 dm3) and similar geometric configuration utilizing eight Newtonian and five non-Newtonian fluids. The effects of the superficial gas velocity (UGR) and liquid viscosity (μL) had opposite effects on the volumetric oxygen transfer coefficient (kLa). However, they presented the same orders of magnitude showing that the viscosity effect on oxygen mass transfer cannot be neglected. A correlation for kLa based on dimensional analysis considering the effects of the geometric parameters, the physical properties of the fluid, and the operational conditions presented a very good fitting to the experimental data. The correlation shows that the influence of the reactor internal diameter on kLa was considered positive. Therefore, in larger-scale reactors an appropriate oxygen transfer can be reached under smaller aeration conditions.

Keywords
Airlift bioreactors; Mass transfer; Hydrodynamics; Newtonian fluids; Non-Newtonian fluids; Scale-up
First Page Preview
Oxygen transfer in three scales of concentric tube airlift bioreactors
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 51, Issues 1–2, 15 August 2010, Pages 40–47
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering