哈特曼数

哈特曼数（Hartmann number，Ha) 是电磁力和黏滞力之间的比例，最早是由丹麦物理学家朱利叶斯·哈特曼（Julius Hartmann,1881-1951）开始使用，定义为：

\mathrm{Ha} = B L\sqrt{\frac{\sigma} {\mu}}

其中

单词	Hartmann number
释义	Hartmann number 中文百科哈特曼数哈特曼数（Hartmann number，Ha) 是电磁力和黏滞力之间的比例，最早是由丹麦物理学家朱利叶斯·哈特曼（Julius Hartmann,1881-1951）开始使用，定义为： $\mathrm{Ha} = B L\sqrt{\frac{\sigma} {\mu}}$ 其中 B 为磁场 L 为特征长度 σ 为导电率 μ 为动黏度英语百科 Hartmann number 哈特曼数 Hartmann number (Ha) is the ratio of electromagnetic force to the viscous force first introduced by Hartmann. It is defined by: where
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Hartmann number