Effective emissivity of a hole
Input(s)
e: Emissivity of the Cavity Walls (dimensionless)
f: Friction Factor (dimensionless)
Output(s)
\(\boldsymbol{e}_{\boldsymbol{h}}\): Emissivity of Hole (dimensionless)
Formula(s)
\[
e_{h}=\frac{e}{e+f *(1-e)}
\]
Reference(s)
Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second Ed.). John Wiley & Sons, Chapter: 16, Page: 493.