Courtin number
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The Courtin rotational parameter is a dimensionless number used in rotational flow calculations. It expresses the relationship between the torque and angular velocity of a rotating flow. Its main application is in problems involving one cylinder rotating inside another separated by viscous incompressible fluids.
It is defined as:
where
- τ is the torque;
- ω is the rotational velocity;
- ρ is the liquid density;
- Di is the diameter.
