气体和液体中总的摩尔数之比。
当横流雷诺数与射流雷诺数之比大于0．5之后，有横流时的冲击射流冷却局部努赛尔数比无横流时有较为显著下降。
When the cross-flow to jet Reyuolds number ratios are greater than 0. 5, the jet impingement Nusselt numbers arc obviously lower than that without cross-flow.
但是不论在外侧或内侧，随着离子电荷数增大，波驱动的等离子体电导率降低，而它与斯必泽-亥姆电导率之比却增大。
At both sides as the ion charge number is increased, the conductivity in LHW driven plasma decreases, but the ratio of this conductivity and the Spitzer-Harm conductivity increases.
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