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来自维基百科,自由的百科全书
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[1][2],定义为:
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