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THeat2: Temperature response of a suddenly cooled wire

Determine the temperature response of a copper wire of diameter d, originally at temperature T0, when suddenly immersed in air at temperature Tair. The convection coefficient between the wire and the air is α.

Problem Type:
Plane problem of heat transfer.

Geometry:
d = 0.1 cm.

Copper wire heat transfer model

Given:
Copper initial temperature T0 = 150°C,
   thermal conductivity λ = 391 W/m·K,
   specific heat C = 383 J/kg·K,
   volume mass density ρ = 8930 kg/m3;
Air temperature Tair = 40°C,
   convection coefficient α = 10 W/K·m2.

Problem:
Determine the temperature in the wire.

Solution:
A time step of 1 s is used to run numerical analysis.
Analytical solution*: (T - Tair) / (T0 - Tair) = exp(-0.0117·t)

Results:

Temperature in a wire:

DC wire thermal simulation

Temperature, °C

Time

QuickField

Reference*

30 s

117.5

117.4

60 s

94.6

94.5

120 s

67.1

67.0

* Reference: Frank Kreith, Raj M. Manglik, Mark S. Bohn Principles of Heat Transfer, Cengage Learning, Jun 10, 2010 - Technology & Engineering - 696 pages, Page 119, Example 2-10.

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