Jet mixer design procedure

[JPGZE]

Hello,

I'm in the process of designing a jet mixer unit to produce a coarse water-in-oil emulsion with droplet size approimately 10 microns.

The continuous-phase of volume fraction 0.07 is to be comprised of fuel oil and PiBSA emulsifier and the disperse-phase of volume fraction 0.93 made up of supersaturated ammonium nitrate solution.

If anyone has any links to some resources that may be useful I would be very appreciative. I've searched extensively, though most of the material I've come across for the design of such systems focusses upon blending fuels in tanks prior to pumping.

Thanks.

 

[jmw]

Visit

http://www.jiskoot.com

who develop and use jet mixers for fuel and oil blending but you may need to look elsewhere if you are forming emulsions.... you might try searching the MAN B&W engine site as they have spent a lot of time and effort in researching fuel water emulsions.

There was a company in Germany that produced FWE equipment but as I recall they used a homogeniser which was a form of fuel mill, I think. I can't find them now and the web link I had comes back "not found". This was engine scale homogenisation though.

A Fuel Water Emulsion web search produces many good references. The two key processess I can think of are Orimulsion (the BITOR process?) and Purinox:

http://www.lubrizol.com/PuriNOx/understand.asp

The other principal emulsion reference source might be found from Orimulsion.
I would guess either of these processes might reveal some helpfull information on how they create their emulsions.

With luck and using FWE and Orimulsion in your searches you may find some relevant information in any of the scientific web sites such as at SCANIA or the California / Federal fuel research programs, DNV and so on.


JMW

http://www.ViscoAnalyser.com

 

[StoneCold]

These guys might be able to help you. Hydrodynamics.com They have a cool cavitation process. I have also seen high pressure pumps that run the material through multiple orfice plates to cause cavitation and mixing to form emulsions. I looked through my list of links but did not come up with the company.

Regards
StoneCold

 

[jmw]

Static mixers tend to generate high pressure drops while jet-mixers are neutral for presure drop. In big systems this makes a serious impact on the cost of pumping.

JMW

http://www.ViscoAnalyser.com

 

[JPGZE]

I'm considering a static mixer (Kenics type) to refine the emulsion after the jet mixer unit.

The viscosity of the emulsion exiting the jet mixer is to be around 7000 cP, and the final emulsion product is to have viscosity around 20000 cP.

From my calculations thus far there does appear to be a significant pressure drop across the jet mixer (around 400kPa). For this calulation I used;

delta P = 0.5*p*(Un - Um)^2

where; p is the density of the disperse-phase through the jet nozzle, Un is the jet velocity, Um is the emulsion exit velocity.

Thanks to everyone who has replied so far.
Jamie

 

[unclesyd]

We use similar devices to create emulsion even invert ones that is very critical that they remain stable for long periods of time. These device replaced Gaulin Homogenizers.

http://www.hinsilblon.com/Hummix.htm

http://www.hielscher.com/ultrasonics/index.htm