SeRGeiSarov 
May 4, 2009 11:57 
How to calculate Nusselt number
Hello I need to calculate the Nusselt number for liquid sodium in a pipeline. Length of the pipeline is 3 meter. Diameter of the pipeline is 0.3 meter. Heat flux through outer surface of the pipeline is equal zero. Temperature on the right side and left side of the pipeline is 573 K and 773 K, respectively. Solution of the problem is free convective heat transfer.
Nu= /
is heat flux coefficient for liquid sodium at 673 K (average temperature)
is effective heat flux coefficient including effect of free convective heat transfer. =Q /S T
Q is heat flux through surface
is the length
S is cross sectional area of the pipe
T is temperature difference (200 K)
Which the surface have be used for calculation of Q? (the right side, the left side, the outer surface) How to calculate Nusselt number?
TIA
