If the laminar flow of the fluid having the viscosity μ is flowing through the pipe of the diameter D. Pressure gradient in the flow is \(\left( { - \frac{{\partial p}}{{\partial x}}} \right)\). What is the average velocity of flow?
1
\(V = \frac{1}{{32\mu }}\left( { - \frac{{\partial p}}{{\partial x}}} \right){D^2}\)
2
\(V = \frac{1}{{8\mu }}\left( { - \frac{{\partial p}}{{\partial x}}} \right){D^2}\)
3
\(V = \frac{1}{{16\mu }}\left( { - \frac{{\partial p}}{{\partial x}}} \right){D^2}\)
4
\(V = \frac{1}{{4\mu }}\left( { - \frac{{\partial p}}{{\partial x}}} \right){D^2}\)