(b) In a nuclear reactor, 1 cm diameter cylindrical uranium rods cooled by pressurized water flow from outside serve as the fuel. Heat is generated uniformly in the rod (k = 29.5 W/m-K) at a rate of een 20×10 W/m³. (i) If the outer surface temperature of the rod is 220 °C, determine, q,, the value of heat flux on the outer surface of the rod by using the steady 1-D heat conduction equation: d dT dr dr gen Fr k [10 marks] (ii) In order to maintain the surface temperature of 220 °C, determine the required flow velocity of the pressurized cooling water of 20 °C, using the heat balance at the surface and the correlation for the average Nusselt number for forced convection over a circular cylinder in cross flow: NuD = 0.683 Re 0.466 Pr/3 The properties of pressurized water [10 marks] T (°C) (kg/m³) 20 1001 120 945 k (W/m-K) x103 (kg/m-s) Pr 0.602 0.999 7.01 0.683 0.235 1.44