Water flows through a long $2\mathrm{.}5$ cm ID copper tube at a

bulk velocity of $2\mathrm{.}5\frac{m}{sec}$ and is heated by steam

condensing at $120C$ on the outside of the tube. The

water enters at $25C$ and leaves at $50C.$ Find the

film heat transfer coefficient $(h_i).$ The properties of

water at the average temperature are: Density

$=1000k\frac{g}{m^3}$; Specific heat $C_p=4\mathrm{.}187k\frac{J}{k}gK$;

Viscosity $=0\mathrm{.}68cP$; Thermal conductivity

$k=0\mathrm{.}02\frac{W}{m}K$