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why does nusselt number never reaches a fixed number when i plot it?

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Old   January 5, 2012, 18:34
Default why does nusselt number never reaches a fixed number when i plot it?
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seyyed ali tabatabaei
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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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