Mercury at an inlet bulk temperature of 90?C flows through a 1.2-cm-ID tube at a flow rate of 4535 kg/h. This tube is part of a nuclear reactor in which heat can be generated uniformly at any desired rate by adjusting the neutron flux level. Determine the length of tube required to raise the bulk temperature of the mercury to 230?C without generating any mercury vapor, and determine the corresponding heat flux. The boiling point of mercury is 355?C.GIVENMercury flow in a tubeInlet bulk temperature (Tb,in) = 90?CInside tube diameter (D) = 1.2 cm = 0.012 mFlow rate (m) = 4535 kg/h = 1.26 kg/sOutlet bulk temperature (Tb,out) = 230?CBoiling point of mercury = 355?CASSUMPTIONSSteady stateFully developedflow

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Unlform Heat Flux, g/A to to To.out = 230° C D-1,2 cm Mercury Tain - 90°C m= 4335 kg/h