T-ambient air temperature Temperature T=1 To at r-Ro Fig. 10D.1. Circular fin on a heated pipe. 28 R₁ Ro 10D.1. Heat loss from a circular fin' (Fig. 10D.1). (a) Obtain the temperature profile T(r) for a circular fin of thickness 2B on a pipe with outside wall temperature To. Make the same assumptions that were made in the study of the rectan- gular fin in §10.7. (b) Derive an expression for the total heat loss from the fin.