$1.$ A hydrocarbon is cooled as it flows through a tube of internal diameter $0\mathrm{.}0203$ m

at the rate of $0\mathrm{.}12$ kg s$-1$

$.$The mean bulk properties of the hydrocarbon are:

density: $900$ kg m$-3$

; viscosity: $2\mathrm{.}54$ x$10-4$ kg m$-1$ s

$-1$

specific heat: $976$ J kg$-1$ K

$-1$

; thermal conductivity: $0\mathrm{.}071$ W m$-1$ K

$-1$

What is the Boundary Layer heat transfer coefficient?