Physics:Hartmann number
From HandWiki
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:
- [math]\displaystyle{ \mathrm{Ha} = B L\sqrt{\frac{\sigma} {\mu}} }[/math]
where
- B is the magnetic field intensity
- L is the characteristic length scale
- σ is the electrical conductivity
- μ is the dynamic viscosity
See also
References
- ↑ Moreau, René; Molokov, Sergei S. (2007). "Julius Hartmann and His Followers: A Review on the Properties of the Hartmann Layer". in Molokov, Sergei S.. Magnetohydrodynamics: Historical Evolution and Trends. Fluid Mechanics and Its Applications. 80. Springer. pp. 155–156. doi:10.1007/978-1-4020-4833-3_9. ISBN 978-1-4020-4833-3.
- ↑ Hunt, J.C.R.; Shercliff, J.A. (January 1971). "Magnetohydrodynamics at High Hartmann Number". Annual Review of Fluid Mechanics 3: 37–62. doi:10.1146/annurev.fl.03.010171.000345. Bibcode: 1971AnRFM...3...37H.
- ↑ Cramer, Kenneth R.; Pai, Shih-i (1973). Magnetofluid Dynamics for Engineers and Applied Physicists. Scripta Publishing Company. ISBN 0-07-013425-1.
Further reading
- Jackson, J.D. (1975). "Magnetohydrodynamics and Plasma Physics". Classical Electrodynamics (Second ed.). John Wiley & Sons. ISBN 0-471-43132-X. https://archive.org/stream/ClassicalElectrodynamics2nd#page/n495/mode/2up. Retrieved 2020-05-16. Hartmann number is indicated by letter M in analogy with Mach number for aerodynamics.
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