Is it posasible to use transducers outside of a vessel (i.e. coffee
cup)containing fluid and cause sufficient mixing/stirring/cavitation
to create a vortex that would mix coffee, milk and sugar?  How might
this be achieved?

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Request for Question Clarification by sublime1-ga on 07 Jun 2006 00:36 PDT

k2d...

A magnetic stirrer might be simpler, and more effective:
http://en.wikipedia.org/wiki/Magnetic_stirrer

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Clarification of Question by k2d-ga on 07 Jun 2006 08:36 PDT

A magnetic "bar" inserted innto the fluid would work; however, it
might also contaminate the fluid.  Would multiple ultrasonic
transducers that were positioned so that their sound waves collided
with each other create sufficient cavitation to mix the contents?

Thank

K2d

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Request for Question Clarification by hedgie-ga on 23 Jun 2006 04:18 PDT

The issue is contact with the container. If you pour your coffee into a
 ultrasonic cleaner, it will get stirred. Transducers are built into the walls.

 If you put a coffee cup into field strong enough to mix content, you will
 very likely pulverize the ceramic cup. 

 If washing/sterilising the bar is not enough,
 what about sealing a magnetic bar into disposable sterile  plastic
 enevelopes?  

You can always get fancy:
http://www.freepatentsonline.com/5279463.html

How much many you want to spend and what level of 'contamination'  is acceptable?

Most drafting rooms have/had ultrasonic cleaners for ink pens.

Labs have them too. Some are quite large quart or gallon and some have
a removable stainless steel bucket or beaker.

You can see standing waves in some of them when the operate. baffles
might cause a stirring action.