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Continuous Flow Centrifugation

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Submitted By ktjung
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Continuous Flow Centrifugation

[pic]

Vs = Particle “Settling” Velocity ω = Bowl Rotation Rate (radians/time) R = Distance from Particle to Bowl Axis ρp = Density of Particle ρl = Density of Liquid Dp = Particle Diameter µ = Liquid Viscosity

Solids are removed (liquid clarified) if:
Residence Time in Disk Stack > Settling Time
Maximum Centrifuge Flow Rate for Clarification

[pic]

Q = Liquid Flow Rate to Achieve Clarification
Vt = Terminal Velocity of Particle Under Gravity
Σ = Area of Gravity Setting Tank Equivalent to Centrifuge e = Efficiency Factor (~55% for disk stack centrifuge)

ρp = Density of Particle ρl = Density of Liquid
Dp = Particle Diameter µ = Liquid Viscosity g = Gravitational Constant

ω = Bowl Rotation Rate (radians/time)
N = Number of Disks in Stack θ = Disk Angle rin = Inner Radius of Disks rout = Outer Radius of Disks

[pic] Velocity and Laminar Shear in Filter Module

[pic]

[pic]

Pin = Pressure at inlet to flat plate filter stack.
Pout = Pressure at outlet of filter stack.
2B = Channel thickness (distance between membranes).
W = Channel width.
L = Channel length.
N = Number of channels in filter stack (1/2 number of membranes).
Q = Volumetric flow rate to filter stack.
Effect of Wall Shear on Cell Viability

[pic]

Effect of Turbulent Flow on Cell Viability

[pic]
Recommended Microfiltration Conditions

[pic]

References

B. L. Maiorella, G. Dorin, A. Carion, D. Harano, "Crossflow Microfiltration of Animal Cells", Biotechnology and Bioengineering, 37, p 121-126 (1991).

R. Kempken, A. Preissmann, W. Berthold, “Clarification of Animal Cell Cultures on a Large Scale by Continuous Centrifugation”, J. Ind. Microbiol., 14(1), 52-57 (1995).

Millipore filters

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