Radiated energy flux
Input(s)
c: Speed of Light \((\mathrm{ft} / \mathrm{s})\)
\(\mathrm{h}\): Planck's Constant \(\left(\mathrm{lb} \mathrm{ft}^{2} / \mathrm{s}\right)\)
\(\lambda\): Wavelength (ft)
\(\mathrm{k}\): Stefan-Boltzmann Constant \(\left(\mathrm{BTU} / \mathrm{h} \mathrm{ft}^{2}{ }^{\circ} \mathrm{R}^{4}\right)\)
T: Temperature \((\mathrm{K})\)
Output(s)
q: Radiated Energy Flux from a Black Surface in the Wavelength Range \(\left(B T U / \mathrm{ft}^{2} \mathrm{~s}^{3}\right)\)
Formula(s)
\[
\mathrm{q}=\frac{2 * \pi *\left(\mathrm{c}^{2}\right) * \mathrm{~h}}{\left(\lambda^{5}\right) *\left(\exp \left(\frac{\mathrm{c} * \mathrm{~h}}{\lambda * \mathrm{k} * \mathrm{~T}}\right)-1\right)}
\]
Reference(s)
Bird, R.B., Stewart, W.E. and Lightfoot, E.N. (2002). Transport Phenomena (Second Ed.). John Wiley & Sons, Chapter: 16, Page: 494.