Critical Speed

#Physics
Flow speeds faster than the critical speed of a fluid result in turbulent flow. Speeds slower produce laminar flow

$\displaystyle v_{c}=\frac{N_{R}\eta}{\rho D}$

• $\displaystyle v_{c}$ is the critical speed in a tube
• $\displaystyle N_{R}$ is the Reynolds Number
• $\displaystyle \rho$ is the fluid density
• $\displaystyle D$ is the tube diameter
• $\displaystyle \eta$ is the fluid viscosity