Factor apportioning the 1st armour bedding

Factor for apportioning the thermal capacitance of the first armour bedding

Symbol
$p_{ab1}$
Formulae
$\frac{1}{2 \ln{\left(\frac{D_{a_{1}}}{D_{2_{1}} - 2 t_{ab_{1}}} \right)}} - \frac{1}{\frac{D_{a_{1}}^{2}}{\left(D_{2_{1}} - 2 t_{ab_{1}}\right)^{2}} - 1}$
Related
$D_{2_{1}}$