I have a heat transfer question, I work in a plant and am doing a re-insulation project. If an unexposed steel steam pipe (k=47) of diameter 10 inches, maintains an internal temperature of 460F and is exposed to ambient air (70F) flowing at 5 mph across the pipe. Determine the heat loss per unit length. The inside diameter of the pipe is 9.224 inches and the O.D. is 10.75 inches. Emissivity can be taken as 0.8. σ = 5.6669 x 10^-8. I know you need to find (q/L)rad and (q/L)convection but I'm having trouble figuring out h, the convection coefficient. can anyone help?