Consider a brass tube [k = 115 W/(m°C)], with an outside radius of 4 cm and a thickness of 0.5 cm. The inside surface of the tube is kept at uniform temperature, and outside surface is covered with...

Consider a brass tube [k = 115 W/(m°C)], with an outside radius of 4 cm and a thickness of 0.5 cm. The inside surface of the tube is kept at uniform temperature, and outside surface is covered with two layers of insulation each 1 cm thick, with thermal conductivities of 0.1 W/(m°C) and 0.05 W/(m°C) respectively. Calculate the overall heat transfer coefficient based on the outside surface area of the outer insulation.