Question

Question 2 of 4 < > - / 25 View Policies Current Attempt in Progress Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s over a 1-m-long flat plate that is heated from below with a uniform heat flux of 1250 W/m2. Assume the flow is fully turbulent over the length of the plate. Evaluate properties at 325 K. (a) Calculate the plate surface temperature, Ts(x). in °C, and the local convection coefficient, hx(x), in W/m2.K. at x = 0.5 m. (b) Calculate the average temperature of the plate surface, I s, in °C. Part A Calculate the plate surface temperature, Ts(x), in °C, and the local convection coefficient, hx(x), in W/m2.K. at x = 0.5 m. Ts(x)= i °C hx(x) = i W/m2.K Save for Later Attempts: 0 of 3 used Submit Answer Part B The parts of this question must be completed in order. This part will be available when you complete the part above.

Answer 1

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Page - 1 consider properties of clin at 325k. Thermal conductivity , K = 0.0284 W/m.k Kinematic viscosity, v=18.76 x 10 m/s Prandtl Number , per 6 = 0.703 Air-flow velocity, 5 m/sec Now, at DL 0.5 m - Reynold's Number, Re) V.2 a=0.5m 500.5 18.76 x 10-6 5 Re) 1.333 X 10 2=0.5m Now, since the flow is turbulent over the plate, Nusselt Number, Nu) = 0.0308 Rex Ps 3 D=0.5 m = 0.0308 * (1.333x105)** x (0.703) Nu) 344.68 >=0.5 m Now, we also know that, Nu) - GC-0. x -0.5) C=0.5 m .h 6=0.5m) Nu) хк >=0.5 m

Page - 2 horcosmo 344.68 X 0.0284 0.5 h. 19.578 W/m²K Ang (-0.5 m2 Now, Using Convection Heat transfer equation, (T). 11 Heat Flue, q" h hones [(TM)0 -0.5 25 19.578 [(Ts lacos ... 1250 S] こ 88.85 °C C :: (Ts) cosm Ans Ans: Plate surface tempercture at a=0.5m is (Ts) = 88.85°C, and DC -0.5 m The Local convection coefficient at a=0.5 mis hocco.sm = 19.578 W/m?k. (x=0.5m)