viscosity of water/oil mixtures 2

[difdo]

Hi Everyone,

I need some help about undestanding why a mixture of 0.70 mass fracion of water, 0.30 of oil (c7-c30), has a viscosity of 3.4cP at 25psig and 180ºF, while pure water at the same conditions has a viscosity of 0.30cP and pure oil 0.91cP.

Thank u all for ur help.

Regards.

 

[Compositepro]

Because it is an emulsion of oil droplets in water. Surface tension of the droplets causes energy to be required to deform the droplets from spherical or to be reduced in size. A suspended droplet behaves like a soft partcle.

 

[difdo]

Thank u very much for ur help--> compositepro.

Additionally, I would like to know how to explain this behaviour in terms of interphase energy models.

I found in an article that the maximun viscosity value for this kind of emulsion is when the emulsion turns from o/w to w/o, what is the specific explanation for this behavior?

Thank U.

 

[Unotec]

It is called an invert emulsion. The oil coats the water. I have never seen it temperature caused, more likely caused by the use of surfactants.

<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying ” Damn that was fun!” - Unknown>>

 

[difdo]

Hi!

How can I predict the behavior of the viscosity of oil/water emulsions?

What correlation Can I select to calculate these viscosities?

Any one knows, How does Hysys make this calculations?

Thank u

 

[25362]

Thread135-120558 seems to shed some light on the subject.

 

[25362]

Fromm Googleing around I found that the bimonthly Jourmal of Rheology brings an article that could probably be found in a technical library or purchased titled Novel viscosity equations for emulsions of two immiscible liquids appearing in the J. Rheol. Volume 45, Issue 2, pp. 509-520 (March 2001)
PDF: (US$27)
Publisher: SOR Rajinder Pal
Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

The abstract says:

Starting from the Taylor equation [Taylor, G. I., Proc. R. Soc. London Ser., A 138, 41–48 (1932)] for the viscosity of very dilute emulsions, new viscosity equations are developed for concentrated emulsions using the effective medium approach.
According to the equations derived in the paper, the viscosity of concentrated emulsions increases with the increases in the volume fraction of the dispersed phase and the viscosity ratio (K) of the dispersed phase to the continuous phase.
In the limit of K, the equations reduce to the well-known formulas for solids-in-liquid suspensions. The proposed equations are evaluated in light of a large body of experimental data for concentrated emulsions, covering a broad range of dispersed-phase to continuous-phase viscosity ratio (3.87×10–4K3.25×105).

 

[difdo]

Thank you so much for ur help 25362

The information you provide is excellent.

Regards.

 

[jmw]

You could look at this answer at Cheresources:

http://www.cheresources.com/questions/physical_property_information-325.html

JMW

http://www.ViscoAnalyser.com