流体流动过程，包括流体输送，过滤，固体流态化。
Fluid flow processes, including fluids transportation, filtration, solids fluidization.
本文用垂直同轴圆柱环形空间内的螺旋流流场作为钻井井内流体流场的理想化模型，得出了任意纯粘性流体螺旋流流场的速度及排量表达式。
The expressions of velocity and flow rate of helical flow of a general viscous fluid has been obtained by using helical flow in a vertical annular space as an idealized flow model.
根据计算流体力学理论对空化流场进行数值模拟，从理论上验证水力空化的发生效果。
Finally, numerical simulation based on computer fluid dynamic (CFD) has been made for verifying the effect of hydrodynamic cavitation theoretically.
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