Answer Happy

Problem 02: Too, U. Experiments have been conducted on three geometrically similar air-foils. Since airfoils are thin, the fluid flow over airfoils can be considered to be like flow over flat plate, i.e., the streamwise pressure drop can be neglected. The width of airfoils (perpendicular to air stream) is 1.0 m. Neglect the curvature of airfoils in your calculations. The results obtained from experiments are shown below: Air temp., T (K) 300 300 300 Considering the results presented in the above table, answer the following questions: Airfoil No. 1 2 3 Length, L (m) 1 0.2 0.5 Air foil Velocity, U (m/s) 10 5 10 Airfoil temp., Ts (K) 320 320 320 Pr = 0.7 Friction force, F (N) 1 0.1 ??? 1- We know that Cf = C Rem in which Cf and Re, are the average friction coefficient and the Reynolds number, respectively. Moreover, C and m are two constant parameters. Find C and m. 2- Calculate the friction force imposed on airfoild No. 3. 3- Calculate the heat transfer rate between airfoil No. 1 and the air stream Note: Thermophysical properties of air is constant in all experiments. p = 1 kg.m-³ μ = 10-5 Pa.s k = 0.05 W.m-¹.K-¹