Anuclear fuel rod of diameter 30 mm generates heat uniformly at a rate of 7 × 108 w/m3 and is cooled by a circulating coolant at 20°c. the convection heat transfer coefficient at the surface is h = 7000 w/m2 .k and the thermal conductivity of the fuel rod material is 52 w/m. k. in case of coolant pumping system failure, the surface temperature of the fuel rod could be estimated as the average of the steady state surface and the center temperatures of the rod. nuclear fuel rods are typically clad to prevent the leakage of radioactive material into the coolant. if you were given a choice to clad the fuel rod with either aluminum, stainless steel or zirconium, what material would you use ?

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.