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速度梯度
[流] velocity gradient
- 过滤过程滤层中沉积物的空隙率随水流平均速度梯度的改变而变化。
In the duration of deep bed filtration the void ratio of sediment will be varied with the average flow velocity gradient. - 径向速度梯度同样随转速增大而增大的结果，增强了叶尖涡对尾迹区作用的影响。
As the radial velocity gradient is intensified with the rotary speed, the effect of the shedding vortex on trailing wake is boosted up. - 这样回避了速度梯度间断的困难，缓和了出口处应力奇性引起的矛盾，同时又减少了计算量。
Thus the difficulties of discontinuous velocity gradient and the stress singularity at the exit point are avoided, and the expense of computation is reduced.
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