U$3\mathrm{.}2$ SAE$10$ oil at $20C$ flows through a pipe with an internal diameter of $0\mathrm{.}230m.$ Determine the maximum possible value of the mean oil velocity at which the flow is still laminar. At the given temperature, the oil has a kinematic viscosity of $9\mathrm{.}5*{10}^{-5}{m}^2{s}^{-1}.$ What is the value of the volumetric flow rate of the oil at that mean velocity?

Result: The oil flows at a maximum mean velocity of $0\mathrm{.}95m{s}^{-1}($taking the critical value Reynolds number of $2300).$ The volumetric oil flow rate is $0\mathrm{.}0395m^3{s}^{-1}.$