Estimating physical proporties of a liquid/vapor glycol mixture
Estimating physical proporties of a liquid/vapor glycol mixture
(OP)
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.
Any help would greatful.





RE: Estimating physical proporties of a liquid/vapor glycol mixture
Good luck,
Latexman
RE: Estimating physical proporties of a liquid/vapor glycol mixture
Density
Cp
thermal conductivity
dynamic viscosity
RE: Estimating physical proporties of a liquid/vapor glycol mixture
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
RE: Estimating physical proporties of a liquid/vapor glycol mixture
RE: Estimating physical proporties of a liquid/vapor glycol mixture
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/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:
http:
But beyond that I can't help I'm afraid.
JMW
www.ViscoAnalyser.com
RE: Estimating physical proporties of a liquid/vapor glycol mixture
http://www.meglobal.biz/product-literature
RE: Estimating physical proporties of a liquid/vapor glycol mixture
JMW
www.ViscoAnalyser.com