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Temperature distribution in an electric wire

electric wire temperature distribution, heating of electric wire, multiphysics analysis

Calculate the temperature distribution in a long current carrying wire.

Problem Type:
Axisymmetric multiphysics problem of DC Conduction coupled to Heat Transfer.

Geometry:
Temperature distribution in an electric wire Calculate the temperature distribution in a long current carrying wire I Wire Air free convection: α, T0 Ø d

Given:
Wire diameter d = 0.75";
Resistance ρ = 9.35·10-8 Ohm/m;
Electric current I = 1000 A;
Thermal conductivity λ = 13 Btu·ft/(h·ft²·°F) = 22.5 W/(K·m);
Convection coefficient α = 5 Btu/(h·ft²°F) = 28.4 W/(K·m²);
Ambient temperature To = 70°F = 21.1°C.

Task:
Calculate the temperature distribution in the wire.

Solution:
We arbitrary chose a 1-foot (12") piece of wire to be represented by the model.
Material electric conductivity is σ = 1/ρ = 1/9.35e-8 = 10.7·106 S·m.
For the conduction problem we specify normal current density at one end j = I /(πd²/4) [A/m²] and zero voltage at another end of the wire, and a zero current condition at its surface.
For heat transfer problem we specify zero thermal flux conditions at the sections of the wire and a convection boundary condition at its surface.

Results:
Temperature distribution in an electric wire:

Temperature distribution in an electric wire

  Center line temperature Surface temperature
Theory 419.9 F (215.5 °C) 417.9 F (214.4 °C)
QuickField 215.5 °C 214.3 °C

* Reference: W. Rohsenow and H. Y. Choi, "Heat, Mass, and Momentum Transfer", Prentice-Hall, N.J., 1963.

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