2 Average flow velocity in turbulent tube flow. (a) For the turbulent flow in smooth circular tubes, the function' 1/n D = (1-2)% Vz,max R is sometimes useful for curve-fitting purposes: near Re = 4 × 103, n = 6; near Re = 1.1 × 105, n = 7; and near Re = 3.2 × 10%, n = 10. Show that the ratio of average to maximum velocity is = Vz,max 2n² (n+1)(2n+1) Determine the value of the above expression for Re values of 1.1×105 and 3.2×106