速度梯度，指流体在两界面之间流动时，由于材料之间摩擦力的存在，使流体内部与流体和界面接触处的流动速度发生差别，产生一个渐变的速度场，称为速度梯度，或称切速率、剪切速率。
讨论了温度、压力、速度梯度对保护储效果的影响。
The influence of temperature, pressure and shear rate on formation damage are also discussed.
结果表明，螺杆反应器的啮合区具有较大的速度梯度，有利于物料的充分混合。
The results show that a large velocity gradient emerges in the intermeshing region of the screw reactors, which is helpful to mix materials sufficiently.
近壁对总压测量影响不大。速度梯度和近壁对测量误差的影响还与来流方向有关。
The effects of the velocity gradient and wall-proximity on the measuring errors are related to the flow direction.
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