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Hartmann number
Dimensionless parameter in fluid mechanics From Wikipedia, the free encyclopedia
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The Hartmann number (Ha) is the ratio of electromagnetic force to the viscous force, first introduced by Julius Hartmann (1881 – 1951) of Denmark.[1][2] It is frequently encountered in fluid flows through magnetic fields.[3] It is defined by:
where
- B is the magnetic field intensity
- L is the characteristic length scale
- σ is the electrical conductivity
- μ is the dynamic viscosity
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