VI$\mathrm{.}5$ Cooling oil is being cooled in horizontal heat exchanger with tube bundle. The bundle consists of $37$ tubes with length of $2$ m and $38$ mm outer diameter. The shell is a tube with internal diameter of $350$ mm$.$ The oil flows through the shell space of the heat exchanger and its mean velocity is $0\mathrm{.}15$ m$.$s$-1.$ The mean temperature of the oil is $65\backslash$deg C$,$ mean temperature of the tube walls is $60\backslash$deg C$.$ The properties of oil at $65\backslash$deg C are: density $850$ kg$.$m$-3$;kinematic viscosity $10-5$ m$2.$s$-1$; heat conductivity $0\mathrm{.}12$ W$.$m$-1.$K$-1$; heat capacity $2\mathrm{.}12$ kJ$.$kg$-1.$K$-1$; volumetric expansion coefficient $4\mathrm{.}10-4$ K$-1.$ Dynamic viscosity of the oil at $60\backslash$deg C is $9\mathrm{.}8$ mPa.s$.$ Calculate the heat transfer coefficient on the side of oil.

Result: The heat transfer coefficient is $66\mathrm{.}9$ W$.$m$-2.$K$-1.$ explin the steps as I am not good at het transfer; also include a sketch to represent this questions