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-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.
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-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.
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter5: Analysis Of Convection Heat Transfer
Section: Chapter Questions
Problem 5.25P
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![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-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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F507ff6bb-133c-4187-98a3-1c74a97eadd4%2F4270e58c-8b67-4f12-b43a-b9cbbcaa8884%2Fu0p281i_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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-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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