Consider application of the naphthalene sublimation technique (Problem 6.51) to a gas turbine blade that is coated with naphthalene and has a surface area of As = 0.05 m2

To determine the average convection heat transfer coefficient for a representative operating condition, an experiment is performed in which the coated blade is exposed for 30 min to atmospheric air at the desired velocity and a temperature of T∞ = 27°C. During the experiment the surface temperature is Ts = 27°C, and at its conclusion the mass of the blade is reduced by ∆m = 8 g. What is the average convection heat transfer coefficient associated with the operating condition?

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Turbine blade with naphthalene coeting A,, T, PT) Air flow V, T