Water at 50C enters 1.5 cm diameter tube of a heat exchanger. Assume velocity of water at mean temperature as I m/s. The tube surface is maintained at 90C. Calculate the exit water temperature if the length of tube is 2 m Assume following properties of water at mean temperature (neglect variation in properties with temperature). H=489.2 x 10 kg/(m.s) p=984.4 kg/m k = 0.656 W/m K Cp=4178 J/kg K Use following correlations: f = 0.079 Re-0.25 Nup 1 /2) [Rep-1000).Pr 1+12.7 [1/2] (Pr2/3-1) TAL