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 f parallel to the flow, and height g normal to the flow. for reynolds numbers in the range 104 5hg 5 104 , the idfhdyhudjhg nusselt numbers are well correlated by an expression of the form the values of & and p for the front face, side faces, and back face of the rectangular rod are found to be the following: )dfh f/g & p front 0.33 f/g 1.33 0.674 1/2 side 0.33 0.153 2/3 side 1.33 0.107 2/3 back 0.33 0.174 2/3 back 1.33 0.153 2/3 determine the value of the average heat transfer coefficient for the entire exposed surface (that is, averaged over all four faces) of a f 40-mm-wide, g 30-mm-tall rectangular rod. the rod is exposed to air in cross flow at 9 10 m/s, 7 300 k. provide a plausible explanation of the relative values of the face-averaged heat transfer coefficients on the front, side, and back faces.