1.) Consider an aluminium pipe (k=237W/mK) with an outside diameter of 4.5cm and surface temperature of 130C.16 equally spaced aluminium longitudinal fins, each of thickness t=1.5mm and length l=20mm are attached on the outer surface of the pipe as shown in the figure. If the surrounding air is at 20C and the corresponding convective heat transfer coefficient is 45W/m2K a) What is the percent increase in heat transfer for the finned pipe over that for the unfinned pipe? b) Determine the percent increase in heat transfer as in part (a) for convection coefficient values of 10,25,100,200W/m2K and plot the results (\% increase in heat transfer vs h) and comment on what conclusions can be reached from the plot