The discussion focuses on determining characteristic lengths for Reynolds, Grashof, Nusselt, and Biot numbers, specifically for geometries such as a plane wall, cylinder, and sphere. The characteristic length for Reynolds number is defined as the diameter of a pipe, while the Biot number's characteristic length is calculated using the formula volume divided by external surface area. Participants recommend consulting the Incropera textbook for detailed methodologies and suggest starting with Wikipedia articles for foundational knowledge.
PREREQUISITESStudents and professionals in mechanical engineering, particularly those specializing in fluid dynamics and heat transfer, will benefit from this discussion.
Have you tried a search, and see to where that leads.goggles31 said:There are characteristic lengths for Reynold's, Grashof, Nusselt, and Biot number but the method of obtaining them is not given in my notes. I would like to know how to do so for a plane wall, cylinder and sphere. Thank you.