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Home Dancing Water Project

Home Dancing Water Project

RE: Home Dancing Water Project

Very laminar-flow nozzles.

A cheap PLC, my favorite is a CLICK!.


Keith Cress
kcress - http://www.flaminsystems.com

RE: Home Dancing Water Project

You can make laminar flow nozzles relatively easily... I've considered doing similar but time has not been a friend of mine. Other projects always take precedence.

One thing to note with the EPCOT video that they don't show... how it's actually done. While the nozzles are required for a solid arc, what you don't see are how they stop the flow. Most would think they turn off the water, but if you do that you get "drooling". They actually use a water knife to cut the flow, essentially diverting the flow internally with another blast of water until another arc is desired.

Dan - Owner
http://www.Hi-TecDesigns.com

RE: Home Dancing Water Project

I love those things too- amazing!

The laminar flow nozzles are pretty much just a bundle of drinking straws in the flow path, no?

Agree that the big challenge is the clean shut-off. Otherwise you won't get those nice "chunks" of water.

RE: Home Dancing Water Project

If you ever see them in person, listen. You'll hear the rush of water from the knife when there's no squirt... then it goes quiet when the squirt starts. I had to figure a lot of this out on my own (pre-Google), but these days I believe there are several sites that provide decent detail.

Also, the nozzles eventually wear out. When the display was first installed, the squirts were nice and tight. Years later, the ends were very loose/blobby, and there was quite a bit of splash outside of the main squirt. Notice in the video how the squirt barely makes it over the kid's head before turning into individual blobs... those nozzles badly need replacement. A new nozzle will make the squirts look like a solid rod from launch to landing.

Dan - Owner
http://www.Hi-TecDesigns.com

RE: Home Dancing Water Project

Yes, SS does better than Cu or brass. We supplied someone some 1/4" x 0.016" wall high strength SS tubing a few years back.
He put 7 tubes into a piece of 1" tube and then they cold drew the whole bundle to compact it to about 0.75" OD. The feedback was that they worked great.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Home Dancing Water Project

IRStuff: I doubt that wear much of an is an issue in laminar flow, and drinking straws aren't going to corrode...

Standard DIY construction seems to be a couple layers of Scotch Brite scouring pad material pad as a flow distributor, followed by a bundle of drinking straws completely filling a section of PVC pipe, retained by a piece of fine net or mesh. Seem to work pretty well, although the Scotch Brite pad would of course be a filter for any and all crap in the water stream- you'd need a filter upstream to have a hope of having it last in a recirculated fountain.

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