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Heat transfer coefficient for convection

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

Symbol
$\alpha_{sa}$
Unit
W/(K.m$^2$)
Formulae
$\frac{0.0185k_{sa,1}}{k_{sa} D_o}+1.08k_{sa,2} \left(\frac{\Delta \theta_s}{k_{sa} D_o}\right)^{0.25}$
Related
$D_o$
Outer diameter [m]
$\Delta \theta_s$
Temperature difference surface to ambient [K]
$k_{sa}$
Convection factor (Heinhold)
$k_{sa,1}$
Factor 1 for convection heat transfer coefficient
$k_{sa,2}$
Factor 2 for convection heat transfer coefficient
Used in
$T_{sa}$
Thermal resistance by convection, surface to air [K.m/W]