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Time-Dependent Heat Transfer

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Hi,

I am trying to simulate heating a block of metal in a furnace, and have chosen to use a time-dependent external temperature (by creating a piecewise function for T(t) ), to simulate a furnace heating the metal from 300K to 650K.

When I run the model for a simulated time of 12hrs, the temperature only gets to ~350K, and this seems way low for a heated metal. What could I be missing?

Current settings:
T_initial = 300K
T(t) = 0.6*t+300K
External natural convection
Sphere diameter = 9in, air

Thank you!

1 Reply Last Post 7 juil. 2016, 14:09 UTC−4
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 7 juil. 2016, 14:09 UTC−4
See this old thread where we discussed the penetration depth, i.e. the order order of magnitude of how far in temperature will increase by conduction in a given time:
www.comsol.com/community/forums/general/thread/16808
Conduction is a relatively slow process, with the penetration depth increasing only with the square root of time.
If you provided the material properties yourself, you can also check on those, including units.
Best,
Jeff
See this old thread where we discussed the penetration depth, i.e. the order order of magnitude of how far in temperature will increase by conduction in a given time: https://www.comsol.com/community/forums/general/thread/16808 Conduction is a relatively slow process, with the penetration depth increasing only with the square root of time. If you provided the material properties yourself, you can also check on those, including units. Best, Jeff

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