1. A long rod 150mm with anular semicircle cross-section have diameter D=8cm made of low carbon steel protrudes into air at 25C, from a furnace wall at 180C. The convective heat transfer coefficient is estimated at 20W/m2K. Determine the conductivity if the fin tip temperature 1s115C. Also, calculate the temperature at 90 mm from base. For small simicircl d=D/2 as shown in Fig. Assume Adiabatic Fin Tip