Physics
Physics, 26.11.2019 23:31, cascyrio2002

Ametallic 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·k. the airfoil is subjected to air flow at 1 atm, 25°c, and 5 m/s along its 3-m-long side. the average temperature of the airfoil is observed to drop from 160°c to 150°c within 2 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.

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