Substitution coefficient u

Substitution coefficient for the calculation of the thermal resistance to ambient of air-filled pipe with objects, considering point-source correction.

Symbol
$u_p$
Formulae
$\frac{2\left(L_{cm}-L_{cm}-\sqrt{{L_{cm}}^2-\left(\frac{Do_p}{2}\right)^2}\right)}{Do_p}$
Related
$L_{cm}$
Used in
$T_{4piii}$