hw10soln-typed

hw10soln-typed - 1. The surface of a 1.5-m long flat plate...

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1. The surface of a 1.5-m long flat plate is maintained at 40°C, and water at a temperature of 4°C and a velocity of 0.6 m/s flows over the surface. (a)Using the film temperature T f for evaluation of the thermophysical properties, calculate the heat transfer rate per unit width of the plate, q’. (b) Calculate the error in q’ that would be incurred in part (a) if the thermophysical properties of the water were evaluated at the free stream temperature and the same empirical correlations were used. L = 1.5 m T s = 40 Water T = 4 u = 0.6 m/s q’ x Assumptions: (1) Steady-state conditions. Properties: Table A-6, Water (T =4°C=277 K): ρ f =1000 kg/m 2 , μ f =1560 × 10 -6 N · s/m 2 , ν f = μ f / ρ f =1.560 × 10 -6 m 2 /s, k f =0.577 W/m · K, Pr=11.44; Water (T f =295K): ν =0.961 × 10 -6 m 2 /s, k=0.606 W/m · K, Pr=6.62; Water (T s =40°C=313 K): μ =657 × 10 -6 N · s/m 2 .
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This note was uploaded on 08/01/2008 for the course MAE 310 taught by Professor Kuznetsov during the Fall '08 term at N.C. State.

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hw10soln-typed - 1. The surface of a 1.5-m long flat plate...

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