纯粘性流体中与时间有关的一类包括触变性流体和流凝性流体。
The time-dependent group of purely viscous fluids includes the thixotropic and the rheopectic fluids.
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.
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