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Heat Transfer Coefficient for Condensation Formula and Calculator

Fluids Flow Design and Engineering
Heat Transfer Engineering
Thermodynamics

Heat Transfer Coefficient for Condensation Formula and Calculator

Applies to pure vapors on solid horizontal tube surface of diameter D. For moderate temperature differences Eq. 1 have been confirmed experimentally within ± 10% for single horizontal tubes. They also seem to give satisfactory results for bundles of horizontal tubes, in spite of the complications introduced by condensate dripping from tube to tube.

Eq. 1
For film on horizontal tubes
h_m = 0.725 · [ ( k³ · ρ² · g · ΔH_vap ) / ( µ · D · ( T_d - T_o ) ^(1/4) ]

Where:

k = Thermal Conductivity (J/m s K)
ρ = Density (g/cc)
g = Acceleration Due to Gravity (m/s²)
µ = Viscosity (cP)
D = Diameter (m)
T_d = Dew Point Temperature (K)
T_o = Original Temperature (K)
ΔH_vap = Heat of Vaporization (J ft²/s²)
h_m = Heat Transfer Coefficient (W/m K)

Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second Ed.). John Wiley & Sons, Chapter: 14, Page: 447.

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