Problem 5 Aluminum fins 1.5 cm wide and 1.0 mm thick are placed on a 2.5-cm-diameter tube to dissipate the heat. The tube surface temperature is 170 °C, and the ambient-fluid temperature is 25 °C. Calculate the heat loss per fin for h = 130 W/m²K. Assume k = 200 W/m K for aluminum. (Hint: Please use the figure below to determine the fin efficiency, n, in the calculation.) Figure 2-12 Efficiencies of circumferential fins of rectangular profile, according to Reference 3. Fin efficiency, ny 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 2ཎྜ་ྕཎྜཌུ 0 0 0.5 1 1.5 2 2.5 3 L32 (h/kA)/2 L= 12-11 L₁ = L + 12c =₁+Le Am=tLe