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Nu=[tex]\lambda_{eff}[/tex]/[tex]\lambda[/tex]

[tex]\lambda[/tex] is heat flux coefficient for liquid sodium at 673 K (average temperature)

[tex]\lambda_{eff}[/tex] is effective heat flux coefficient including effect of free convective heat transfer. [tex]\lambda_{eff}[/tex]=Q[tex]\delta[/tex]/S[tex]\Delta[/tex]T

Q is heat flux through surface

[tex]\delta[/tex] is the length

S is cross sectional area of the pipe

[tex]\Delta[/tex]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