A horizontal 2.5-cm-OD tube is maintained at a temperature of 27°C on its outer surface. Calculate the average heat transfer coefficient if saturated steam at 12 kPa is condensing on this tube.

GIVEN

? Saturated steam condensing on a horizontal tube

? Tube outside diameter (D) = 2.5 cm = 0.025 m

? Tube outer surface temperature (Ts) = 27°C

? Steam pressure (p) = 12 kPa

FIND

? The average heat transfer coefficient (hc)

ASSUMPTIONS

? Steady state

? Film condensation occurs

SKETCH



PROPERTIES AND CONSTANTS

From Appendix 2, Table 13, for saturated water at 12 kPa


The heat transfer coefficient for this geometry is given by Equation (9.23)

Physics & Space Science

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