Recent content by JohnJohn8

Thank you very much for your answer, but what do you mean by the internal asymptotic Nusselt number?

Hello all, I have a question regarding heat transfer. When the Biot number is small (<0.1) a mass can be regarded as lumped. Which means that the temperature is the same everywhere in the mass. Now if the Biot number is larger than 0.1 (say around 0.5-0.8) and I still do a lumped system...

So a block moves with a certain velocity (dependent on time). There is a free stream going around the block which cools it. I am interested in the temperature distribution of the block. This is a 3D unsteady heat conduction problem with convection boundary conditions. For convection boundary...

Oh yes sorry, it is about cooling a block which moves which a certain velocity. There is a flow going over the block. The textbook in question is 'heat and mass transfer' from Cengel.

Hello all, I am recently graduated in mechanial engineering and started working and so I don't have much experience yet. I have to deal with an unsteady problem. Now in the textbooks a lot steady assumptions are made and so these relations are not really valid for my problem. This is maybe a...