Fully-developed heat transfer in annular passages with arbitrary wall temperatures
 

Hi all,

as you might guess from the title, I am trying to do a simplified calculation of heat transfer for a concentric gap between two pipes with different (but uniform) wall temperatures under forced gas flow conditions.

So far I found in VDI-Wärmeatlas, 1997, Gb1 only correlations for heat transfer with identical inner/outer wall temperatures and a paper for the laminar case [Coelho & Pinho, 2005].

Any idea on which correlation I could apply for the transitional/turbulent case?

Thx in advance!