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-   -   why does nusselt number never reaches a fixed number when i plot it? (http://www.cfd-online.com/Forums/main/95878-why-does-nusselt-number-never-reaches-fixed-number-when-i-plot.html)

Ali taba January 5, 2012 18:34

why does nusselt number never reaches a fixed number when i plot it?
 
hello to all.
im trying to read the nusselt number in a internal laminar flow with Re=200. i have constant heat flux condition on the walls. in the reference values i give the diameter and the inlet temperature. when i plot the nusselt number on the wall, i see it starts about 20, comes down, and when i make the length longer, at last it reaches near zero! why???
can anybody help me out?
thanks


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