Water at 20 degree celsius enters a 4cm o. d tube 4m long and is heated by stream condensing on the outside of the tube. if the water flow rate is 10/kg. determined the temperature of the stream necessary to heat the water at 50degree celsius, and estimate the pressure drop.

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.