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air properties - heat expansion?

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Old   November 25, 2007, 09:52
Default air properties - heat expansion?
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I am doing a natural convection (air) calculation using Boussinesq approximation. The temperature ranges from 6 degree C to 37 degree C.

What reference temperature and heat expansion coefficient should I use for a range of temperature? Is there any website where I can find the values? Thanks!

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Old   November 25, 2007, 10:17
Default Re: air properties - heat expansion?
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A thought:

Locate an equation for coefficient of thermal expansion - if not a perfect gas. As I remember, for a perfect gas,

beta=1/T (where T=absolute temp [K])

Let the simulation compute beta as it determines the T field.



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