A metallic airfoil of elliptical cross section has a mass of 50 kg, surface area of...

A metallic airfoil of elliptical cross section has a
mass of 50 kg, surface area of 12 m2, and a specific heat of 0.50 kJ/kg °C. The airfoil is
subjected to air flow at 1 atm, 25°C, and 6m/s along its 3-m-long side. The average
temperature of the airfoil is observed to drop from 160°C to 140°C within 1 min of cooling.
Assuming the surface temperature of the airfoil to be equal to its average temperature and
using momentum-heat transfer analogy, determine the average friction coefficient of the
airfoil surface. (The air property: ρ=1.184 kg/m3, Cp=1.007 kJ/kg K, Pr = 0.7296)

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Expert Solution

queen_honey_blossom answered 1 year ago

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