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value for dynamic diffusivity

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Old   December 29, 2008, 15:14
Default value for dynamic diffusivity
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soup
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Hi everyone, In Field's char oxidation,it is said in the manual that

Dref is the dynamic diffusivity (recommended value is 1.8e-5 [kg m^-1 s^-1])... Can you tell me how this value is got? Is it a constant?

Thanks & Regards, Soup
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