A cylinder with a surface temperature of $160\backslash$deg C and an outer diameter of $50$ mm passes atmospheric air at a temperature of $40\backslash$deg C at a speed of $50$ m$/$s$.$ Find the heat transferred to the air per unit time along the unit length of the cylinder. T film temperature $=100$ C properties of air K$=0\mathrm{.}113$ kj$/$m c hr

v$=0\mathrm{.}083$ m$3/$s