Abstract
The motion and distribution of microcarriers inside a horizontally rotating cylindrical bioreactor were simulated using spherical ion exchange resin particles. Particle motion deviated much from that expected under ideal conditions. The possible mass transfer enhancing effects of particle translation and cluster rotation are discussed.
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Abbreviations
- C kg/m3 :
-
solute concentration
- D m2/s:
-
diffusion coefficient
- d p m:
-
microcarrier diameter
- J c kg m2/s:
-
solute flux due to cluster translation
- J p kg m2/s:
-
solute flux due to particle translation
- n l/m3 :
-
microcarrier number density
- R m:
-
bioreactor radius
- r m m:
-
mixing plane location
- r 0 m:
-
trajectory radius
- r c m:
-
cluster radius
- r cc m:
-
radial position of cluster center
- v g m/s:
-
particle settling velocity
- x l/m3 :
-
cell concentration
- X m:
-
current particle position on the rotating X axis
- Y m:
-
current particle position on the rotating y axis
- α :
-
liquid fraction actually conveyed by cluster rotation
- β :
-
total associated liquid volume/reactor volume
- γ 0 kg/(cell h):
-
specific oxygen consumption rate
- Δr m:
-
half the distance between mixing planes
- δ m:
-
cluster boundary layer thickness
- ε :
-
microcarrier volume fraction
- v m3/m2 :
-
volumetric flowrate per unit area of fluid in the rotating boundary layer
- μ ∫ Pa s:
-
liquid viscosity
- ρ kg/m3 :
-
density
- τ max Pa:
-
maximum shear stress
- ω l/min:
-
cylinder rotational speed
- A :
-
particle A
- A 0 :
-
initial position of particle A
- B :
-
particle B
- B 0 :
-
initial position of particle B
- c :
-
cluster
- cc :
-
cluster center
- eq, c :
-
equivalent, cluster
- eq, p :
-
equivalent, particle
- f :
-
fluid
- max :
-
maximum
- 0 :
-
initial
- O 2 :
-
oxygen
- p :
-
particle
- r 0 + r m :
-
average radial position
- r 0 − r m :
-
average radial position
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delos Santos, B., Shiragami, N., Unno, H. et al. Simulated-microcarrier motion and its effect on radial medium transfer inside a horizontally rotating cylindrical bioreactor (HRCB) for animal cell culture. Bioprocess Engineering 10, 5–14 (1994). https://doi.org/10.1007/BF00373529
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DOI: https://doi.org/10.1007/BF00373529