Calculation of the individual heat transfer coefficient

Forced convection, turbulent flow

The following equation is valid for turbulent flow conditions (Hausen):
Hausen            where
α = individual heat transfer coefficient [W/m2·K]
dh = hydraulic diameter [m] = 4·A/s
A = cross-sectional area [m2]
s = wetted perimeter [m]
λ = thermal conductivity [W/m·K]
μb = dynamic bulk viscosity [Pas]
μw = dynamic wall viscosity [Pas]
L = tube length [m]
Re = Reynolds number [ - ]
Pr = Prandtl number [ - ]
The equation is valid for: Validity of Hausen
The following equation is also valid (Dittus - Boelter):
Dittus - Boelter
This equation is valid for: Validity of Dittus - Boelter
A large number of other equations are available in literature, for different fluids, flow conditions and geometries.

Back to heat transfer main page
Dimensionless numbers and equations
Forced convection, laminar flow
Typical Nu - Pr - Re relationship

Copyright © 2022 Rheoheat