Consider conditions for which a fluid with a free stream velocity of V = I m/s flows over a surface with a characteristic length of L = I m, providing an average convection heat transfer coefficient of h = 100 W /m2 ∙ K. Calculate the dimensionless parameters Nu L, Re L, Pr, and J H for the following fluids: air, engine oil, mercury, and water. Assume the fluids to be at 300 K. 6.23 For flow over a flat plate of length L, the local heat transfer coefficient hx is known to vary as x -1/2, where x is the distance from the leading edge of the plate. What is the ratio of the average Nusselt number for the entire plate (NU L) to the local Nusselt number at x = L (NU L)?