Cableizer ®

Heat transfer coefficient convection

Heat transfer coefficient for convection in channel acc. Heinhold eq. 18.18 to 18.20

Symbol
$\alpha_{sa}$
Unit
W/(K.m$^2$)
Formulas
$\frac{0.0185k_{sa,1}}{k_{sa} D_{o}}+1.08k_{sa,2} \left(\frac{\Delta \theta_{s}}{k_{sa} D_{o}}\right)^{0.25}$
Related
$D_{o}$
Outer diameter [m]
$\Delta \theta_{s}$
Temperature difference surface—ambient [K]
$k_{sa}$
Convection factor (Heinhold)
$k_{sa,1}$
Factor 1 heat transfer coefficient convection
$k_{sa,2}$
Factor 2 heat transfer coefficient convection
Used in
$T_{sa}$
Thermal resistance convection object—air [K.m/W]