Carbon dioxide at 20 oC is condensed outside a horizontal 13 cm-diameter tube maintained at 15oC

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Carbon dioxide at 20 ^oC is condensed outside a horizontal 13 cm-diameter tube maintained at 15^oC. Calculate the condensation rate (kg/h) per meter of length. 

Modified h_fg (hfg') =156.5 kJ/kg.  At the film temperature (17.5 ^oC), liquid condensate properties: ρ = 795 kg/m³, k = 0.0897 W/m ^oC, kinematic viscosity = 0.0935 x 10^-6 m²/s and Pr = 3.78