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Factor c

Factor $c_{Nu}$ for the calculation of the Nusselt number.

Constant c for Nusselt number in natural convection according to the paper 'The thermal rating of overhead-line conductors part I. The steady-state thermal model' by V.T. Morgan, 1982.

Symbol
$c_{Nu,r}$
Used in
$h_{conv,ext}$
Convection heat transfer coefficient, duct to air [W/(K.m$^2$)]
$\mathrm{Nu}_{ext}$
Nusselt number, duct to air
$\mathrm{Nu}_{og}$
Nusselt number, object to gas
Choices
Range Ra=Gr·Pr$c_{Nu}$
Method Anders
10-10 - 10-20.675
10-2 - 1021.02
102 - 1040.85
104 - 1070.48
107 - 10120.125
Method Hartlein & Black, Chippendale, IEC 60287
104 - 1090.59
109 - 10130.021