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Updated: Jul 13, 2026
08:28
Creating Rapid Oxygen Oscillations in Microbial Single-cell Growth Analysis using a Microfluidic Double-layer Device
Published on: July 18, 2025
Oxygen transport and consumption by suspended cells in microgravity: a multiphase analysis
Ohwon Kwon1, Surendra B Devarakonda, John M Sankovic
1Department of Mechanical Engineering, University of Cincinnati, Cincinnati, Ohio, USA.
Biotechnology and Bioengineering
|July 7, 2007
Summary
Optimizing rotating wall vessel (RWV) bioreactors requires matching rotating speed to bead size for uniform cell suspension and enhanced oxygen transport. Increased speed with larger beads improves nutrient delivery for 3-D cell cultures.
Area of Science:
- Biotechnology
- Biomedical Engineering
- Cell Culture Technology
Background:
- Effective operation of rotating bioreactors is crucial for nutrient transfer and preventing cell damage.
- Rotating wall vessel (RWV) bioreactors are used for cell and tissue culture, requiring optimized suspension conditions.
Purpose of the Study:
- Determine appropriate suspension conditions for bead/cell distribution in RWV bioreactors.
- Evaluate oxygen transport efficiency under varying operational parameters.
Main Methods:
- Numerical analysis using Eulerian-Eulerian multiphase and oxygen transport equations.
- Investigated the effects of bead size and rotating speed as control variables.
Main Results:
- Optimal rotating speed increases with bead size: 10 rpm for 200 µm, 12 rpm for 300 µm, 14 rpm for 400 µm, and 18 rpm for 600 µm.
- Increasing rotating speed and bead size (10 rpm/200 µm to 18 rpm/600 µm) enhanced mean oxygen concentration by ~85% in the vessel's midzone.
- Higher convective flow at 18 rpm/600 µm significantly improved oxygen transport compared to 10 rpm/200 µm.
Conclusions:
- Established criteria for setting RWV bioreactor operating parameters (bead size, rotating speed) based on cell aggregate growth.
- Findings provide design insights for advanced suspension bioreactors for 3-D engineered cell and tissue cultures.
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