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发表于 2010-1-30 23:20:23
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来自 美国
本帖最后由 courageddt 于 2010-1-31 08:39 编辑
Hi, James
It seems that you encountered with a heat sink simulation problem. So far as I know, in order to build this model you shuold know the temperatures on the surface of the heat sink and the heat generation rate of your ALU. These will conjure up the concept of heat transfer coefficient associated with convection, a proportionality coefficient between the heat flux, Q/(AΔt), and the thermodynamic driving force for the flow of heat ΔT (in your problem). Considering radiation, you are also supposed to know the emissvity and absorptivity of your model, of course you know the Stefan-Boltzmann Constant 5.67*10exp(-8) W/(m^2/K) ). So, S*h*(T_surf-T_ambient)+S*ε*σ*(T_ambient^4-T_surf^4)="The rate of change in energy storage", may be in the form of an integral (the heat sink consists of different materials).
By the way, there are 2 kinds of heat transfer types, convection and radiation, on the bounding surface . Hopefully, you may obtain 2 heat transfer coefficients associated with them, respectively, or a summation of them.
Hope that may help. |
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