2. Water flows through a small teflon tube with an inner radius of 10 mm and an outer radius of 14 mm at 290 K and has a mass flow rate of 0.25 kg/s. The outer surface of the teflon tube is wrapped with an electrical heating tape that delivers a uniform surface heat flux of 2500 W/m while the outer surface of the tape has a convective heat transfer coefficient 25W with the surrounding air at 300 K. The thermal conductivity of teflon is k = 0.35; W m K m2K (a) Sketch the problem and clearly label all relevant parameters and variables. (b) Draw a schematic representing this problem using an equivalent thermal circuit. Clearly indicate all important quantities. (c) What is the temperature of the outer surface of the teflon tube? Clearly indicate how you determined the convection coefficient for the water inside the tube. (d) What fraction of the heat delivered by the electrical heating tape is transferred to the water?