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(This is Problem 6-91 in the textbook). Air at 1 atm is flowing over a flat plate with a free stream velocity of 70 m/s. If the convection heat transfer coefficient can be correlated by Nux = 0.03 Rex 0.8 Pr1/3, Determine the friction coefficient and wall shear stress at a location 2 m from the leading edge. Evaluate fluid properties at 20°C.

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batolisis

Answer:

  • friction coefficient =0.00243
  • wall shear stress = 7.091 N/m^2

Explanation:

Air properties at 20⁰c

k = 25.7 w/k, density of fluid β = 1.189 kg/m^3

viscosity α = 1.85 * [tex]10^{-5}[/tex] kg/m

free steam velocity ( v ) = 70 m/s

d from x = 2 m

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