Al-Sammarraie, Ahmed T.; Vafai, Kambiz (2017). "Heat transfer augmentation through convergence angles in a pipe". Numerical Heat Transfer, Part A: Applications72 (3): 197−214. doi:10.1080/10407782.2017.1372670.
The term "frustum" comes from Latinfrustum meaning "piece" or "morsel". The English word is often misspelled as frustrum, a different Latin word cognate to the English word "frustrate".[1] The confusion between these two words is very old: a warning about them can be found in the Appendix Probi, and the works of Plautus include a pun on them.[2]
