- See also
- References
The Magnetic Prandtl number (Prm) is a dimensionless quantity occurring in magnetohydrodynamics which approximates the ratio of momentum diffusivity (viscosity) and magnetic diffusivity. It is defined as:
where:
- Rem is the magnetic Reynolds number
- Re is the Reynolds number
- ν is the momentum diffusivity (kinematic viscosity)
- η is the magnetic diffusivity
At the base of the Sun's convection zone the Magnetic Prandtl number is approximately 10−2, and in the interiors of planets and in liquid-metal laboratory dynamos is approximately 10−5.
See also
- Prandtl number
References
- Critical Magnetic Prandtl Number for Small Scale Dynamo, Schekochihin, A.A., et al. 2004, Physical Review Letters, 92, 5
3 : Dimensionless numbers of fluid mechanics|Fluid dynamics|Magnetohydrodynamics
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