Heat and Mass Transfer

Fluid milk flows through a sanitary stainless steel pipe of internal diameter $D = 0.05\text{ m}$. The convective heat transfer coefficient inside the pipe is $h = 1200\text{ W/(m}^2\cdot\text{K)}$ and the thermal conductivity of milk is $k = 0.60\text{ W/(m}\cdot\text{K)}$. Calculate the Nusselt number ($Nu = h D / k$).