英语

压力: pressure

静压: static pressure

动压: dynamic pressure

静水压:hydrostatic pressure

动理学压力/动力学压力:kinematic pressure

总压:total pressure

释义

压力

在流体力学中,通常所说的压力,严格上来说压强,对应的英文为pressure,它是一个总称,在没有特殊说明的情况下,一般指的是静压。

静压

静压\(P_s\),是流体在静止时所产生的压力,或者 流体在流动时产生的垂直于流体运动方向的压力。

动压

\(P_d = \frac{1}{2}\rho U^2\)

静水压

\(\rho gh\)

动理学压力

\(P_k = \frac{P_s}{\rho}\)

总压

\(P_t = P_s + P_d\)

联想

动力粘性 与 运动粘性

动力粘性 (kinematic viscosity)\(\nu\)
运动粘性 (dynamic viscosity)\(\mu\)
\(\nu = \frac{\mu}{\rho}\)

The kinematic viscosity tells how fast the fluid moves when a certain force is applied, while dynamic viscosity gives you information on the force needed to make the fluid flow at a certain rate. In SI units, dynamic viscosity units are well established as mPa-s, and the most common kinematic viscosity units are cm2/s.