air properties - heat expansion?

November 25, 2007, 08:52

Hi,

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!

phsieh2005

November 25, 2007, 09:17

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.

mw...

(www.adthermtech.com/wordpress3)

November 25, 2007, 08:52	air properties - heat expansion?	#1
phsieh2005 Guest Posts: n/a	Hi, 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! phsieh2005

November 25, 2007, 09:17	Re: air properties - heat expansion?	#2
momentum_waves Guest Posts: n/a	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. mw... (www.adthermtech.com/wordpress3)

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