Figure 3.23. Stainless steel thermal conductivity vs. temperature, Ho et al. (1977).
Therefore in final form, the Nusselt number can be written as,
(3.13)
It can be therefore said that the Nusselt number is a function of 1) thermal conductivity of
the fluid, 2) bulk fluid inlet and outlet temperatures, 3) tube outer wall temperature, 4)
length of the heated section, length of each axial locations, 5) thermal conductivity of
the tube, 6) tube inside diameter, 7) tube outside diameter, 8) current supplied by the DC
power supply, and 9) Voltage supplied by the DC power supply.
y = 0.0156x + 14.53
R² = 0.9982
0
5
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25
0
100
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600
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