Question

QUESTION 3 a) The velocity of a fluid over a solid surface can be assumed to obey the Prandtl power law as shown by the equation below. The equation shows that the velocity of the fluid varies with the thickness of boundary layer, 8. us Calculate the thickness of the laminar sub-layer when benzene flows through a pipe 50 mm in diameter at 2000 cm/s. What is the velocity of the benzene at the edge of the laminar sub-layer? Assume that fully developed flow exists within the pipe for benzene, ρ-870 kg/m, μ 0.7 mNsm2 Show that the thickness of the laminar sub-layer is nearly inversely proportional to the Reynold number (u/udp) and hence the velocity. b)

Answer 1