Problem $5$: Consider a $3$ m long tube with a $1\mathrm{.}26$ cm inside diameter. Determine the convective

transfer coefficient when

Water flows at $2\frac{m}{s}.$

Oil $($SAE $50)$ flows at $2\frac{m}{s}.$

Air at atmospheric pressure flows at $20\frac{m}{s}.$

Where Laminar flow: $h=3\mathrm{.}66\frac{k}{D}$ and turbulent flow: $h=0\mathrm{.}023\frac{v^{0\mathrm{.}8}{k}^{0\mathrm{.}6}(c_p{)}^{0\mathrm{.}4}}{D^{0\mathrm{.}2}{v}^{0\mathrm{.}4}}$