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How about a cylinder?  (Or, rather, a cyclinder within a cylinder,  
filling the space in between with your fluid(s).)

There are a number of classic viscosity experiements in which  
cylinders best demonstrate the reversability of interactions with a  
low Reynold's number.

It would be nice to compare a turbulent system (high Reynold's) side  
by side with a highly viscous (low Reynold's) system.


--Jason Jay Stevens



On Jan 28, 2009, at 6:17 PM, Ian Russell wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
> Incorporated, a worldwide network of science museums and related  
> institutions.
> ********************************************************************** 
> *******
>
> The most famous source for 'flow-tracing fluid' is the Kalliroscope
> Corporation: http://www.kalliroscope.com/
>
> For the exhibits I produce, I've started buying 'Pearl Swirl' from  
> Steve
> Spangler Science: http://www.stevespanglerscience.com/product/1218  
> who have
> provided an excellent service.
>
> Practical hints. Be aware that the particles settle quite quickly,  
> leaving
> you with a clear liquid. This is no problem for designs where the  
> whole mass
> of water is stirred up by being spun round. Also consider how your  
> design
> will deal with the inevitable air bubbles. A flat-topped enclosure  
> may be
> less problematic to make than a dome or sphere, and still looks  
> pretty good.
> If you do go for a dome, it doesn't need to be completely full of  
> liquid.
> Reduce the volume and weight by constructing another smaller dome  
> inside.
> The smaller you make this exhibit, the easier it is to manage, so  
> don't
> design it any bigger than necessary.
>
> Promoting public engagement with science
> through a contagious delight in phenomena
> *
> [log in to unmask] * http://www.interactives.co.uk
> *
> Give people facts and you feed their minds for an hour.
> Awaken curiosity and they feed their own minds for a lifetime.
> *
> Ian Russell
>
>
> -----Original Message-----
> From: Informal Science Education Network
> [mailto:[log in to unmask]] On Behalf Of Mario Martinez
> Sent: 28 January 2009 23:29
> To: [log in to unmask]
> Subject: RV: Turbulence liquid formula
>
> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
> ********************************************************************** 
> ******
> *
>
> Hello everybody.
>
> We at Planetario Alfa in Monterrey Mexico, want to fabricate a  
> Turbulence
> Table or a Sphere. Does somebody know the formula to prepare the  
> liquid
> inside this kind of exhibits? I will thank this information,
> and any other tip that may help us to make a good exhibit.   Thanks in
> advance for your help.
>
> Mario Martinez
>
> ********************************************************************** 
> *
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>
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