Water at 60°F flows in a 1\frac{1}{2} -in.-diameter horizontal pipe and experiences a pressure drop of 0.03 psi over a 30-ft length of pipe. Calculate the velocity gradient at the wall. Recall that τ = μ \left|du/dr\right| .
Water at 60°F flows in a 1\frac{1}{2} -in.-diameter horizontal pipe and experiences a pressure drop of 0.03 psi over a 30-ft length of pipe. Calculate the velocity gradient at the wall. Recall that τ = μ \left|du/dr\right| .