Circular copper rods of diameter D=1mm and length L=25mm areused to enhance heat transfer from a surface that is maintained atTs,1=100 deg. C. One end of the rod is attached tothis surface (at x=o), hile the other end (at x=25mm) is joined toa second surface that is maintained at Ts,2=0deg. C. Air flowing between the surfaces (and over the rods)is also at a temperature T?= 0 deg. C, and has a convectioncoefficient of h=100 w/m2kelvin.

a. What is the rate of heat transfer by convection from a singlecopper rod to air?

b. What is the total rate of heat transfer from a 1 m x 1 m section of the surface at 100 deg. C, if a bundle of the rods is installed on 4-mm centers?