Estimating physical proporties of a liquid/vapor glycol mixture 1

[MrsLag]

If I have a vapor liquid glycol mixture that has a vapor fraction of more than 50%. Are there any equations I can use to estimated the average property of this mixture.

Any help would greatful.

 

[Latexman]

Which property do you want to estimate?

Good luck,
Latexman

 

[MrsLag]

for the mixture i need


Density
Cp
thermal conductivity
dynamic viscosity

 

[Latexman]

"Are there any equations I can use to estimated the average property of this mixture." Yes there are. An excellent reference is The Properties of Gases and Liquids. The most recent edition, the 5th Edition, is by Robert C. Reid, John M. Prausnitz, and Bruce E. Poling.

You will have to estimate each property for each phase separately and then use an appropriate mixture formula to average the two. For example, for density a volume average would make sense. Ditto for Cp using a weight (or mole) average.

Good luck,
Latexman

 

[joshhamilton]

check out this website

http://www.engineeringtoolbox.com/ethylene-glycol-d_146.html

 

[jmw]

For viscosity, you need the viscosity of the liquid phase at the mix temperature.
This you can get from the manufacturers such as Dow.
Then you need the viscosity of the gas - gas viscosity is mainly a function of the temperature, there is very little pressure effect, so you can use Sutherland's formula as explained at these internet sites:

http://www.lmnoeng.com/Flow/GasViscosity.htm

http://www.grc.nasa.gov/

http://WWW/BGH/viscosity.html

though you will ned to find Sutherlands constant for the vapour.

For the viscosity of the liquid/vapour mix there are a couple of fairly similar equations floating around, mostly from the downhole logging guys, how well they apply to other fluid mixes I couldn't say. A bit of research needed (if you find any better answers, let me know please).
e.g.: we can than calculate the homogenous mixture viscosity: v = xv" + (1- x)v'.
or visit

http://www.google.com/url?sa=t&source=web&cd=17&ved=0CEUQFjAGOAo&url=http://

http://www.aston-berg.co.uk/docs/So...g=AFQjCNEYTtCTv7iITYipGnHSpALJ6DmMxg&cad=rja,

http://www.google.com/url?sa=t&source=web&cd=21&ved=0CBgQFjAAOBQ&url=http://

http://www.aimehq.org/search/docs/V...sg=AFQjCNE3fPHQNrSBK4ZkbyiIWMT7pfu8tw&cad=rja

But beyond that I can't help I'm afraid.



JMW

http://www.ViscoAnalyser.com

 

[unclesyd]

You can get some of the properties of Mono and Die Ethylene Glycol from the brochures of the following site, For other you need to check with Dow as posted above.

http://www.meglobal.biz/product-literature

 

[jmw]

Nice link Unclesid, the viscosity data shows the calculation they used.

JMW

http://www.ViscoAnalyser.com