Solve the following problem:
Q: Experiments have been conducted to determine local heat transfer coefficients for flow perpendicular to a long, isothermal bar of rectangular cross section. The bar is of width c, parallel to the flow, and height d, normal to the flow. For Reynolds numbers in the range 104 < red="">< 5="" x="" 104,="" the="" face-averaged="" nusselt="" numbers="" are="" well="" correlated="" by="" an="" expression="" of="" the="">
Determine the value of the average heat transfer coefficient for the entire exposed surface (that is, averaged over all four faces) of a c = 40-mm wide, d = 30-mrn tall rectangular rod. The rod is exposed to air in Cross-flow at V = 10 m/s, T8 = 300 K. Provide a plausible explanation of the relative values of the face-averaged heat transfer coefficients on the front side and back faces.
