Starting on my own nozzle ..

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Starting on my own nozzle ..

Post  Things on Sun Apr 11, 2010 4:11 am

Thanks to liteglow, I have now been inspired to build my own nozzle!

Unfortunately, I rushed into my 1st attempt and it failed miserably, but now I am moving onto a more serious approach.

I have purchased some 100mm diameter PVC pipe, and the endcaps. I have a sponge at the bottom, and the usual layer of straws.

Tommorow I am going into the workshop, and I'm gonna attempt to make a few nozzles on the lathe.

I have a bit of a question at this point. My pump is rated for 2000LPH, which seems fine for a laminar arch of reasonable size, though I'm wondering, what kind of nozzle diameter should I go for?

Also, does there need to be a gap between the sponge and the straws?

Not much to take a picture of at the moment, but I'll post plenty of pics along the way Very Happy

I just purchased 5 metres of 3mm thick fiber optic cable from eBay to light it. I intend to use 1 or 2 3W RGB LED's, controlled by an Arduino. No cutter or thumper at this point, but will be something to think about once I have finished it Smile

Love reading all the great info on this forum!

Cheers,
Dan

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Re: Starting on my own nozzle ..

Post  liteglow on Sun Apr 11, 2010 6:57 am

This sounds great Very Happy

You must always have in mind that the first nozzle will usually fail.. this is how we learn :-)
100mm, that is only 10cm in diameter ?
Mine is 225mm in Diameter, and I think that is what you should try to start with!

I did a test with a 180mm (i think) and it did fail!

Is the straws straight, or with a bending tip on top?`
About the distance from sponge and the straws, I think you just need to try different things and see what is best!
There is no really answer to that question...
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Re: Starting on my own nozzle ..

Post  Things on Sun Apr 11, 2010 7:06 am

I don't intend to throw arch's quite as big as yours liteglow, so we'll see how the pipe diameter goes Smile

My first nozzle was pretty much a hole in the PVC endcap, and yes it did fail horribly Razz

I'll try and get around to making a few nozzles, like 8mm, 10mm and maybe 12mm.

About the straws: They WERE bendy top, but I spent a good amount of tiem this afternoon cutting all the bendy tops off, so they are no longer
Cool

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Re: Starting on my own nozzle ..

Post  liteglow on Sun Apr 11, 2010 11:41 am

haha, yes I did also use a hole in a pvc end cap for my first attempt :-)
And straws with bended tip was also my first ones.
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Re: Starting on my own nozzle ..

Post  Things on Mon Apr 12, 2010 1:21 am

Alright, knocked up 2 different nozzles for tests. Obviously the one that works best is the one now glued into the PVC endcap Smile Now just waiting for the glue on my inlet nozzle to dry before I can try it out on my pump, but it worked OK on the hose Smile I could get a good meter or so with the hose without it breaking up much, but that was without any filters, and I couldn't push it much further as I haven't glued the PVC endcaps on, so they kept popping off Razz

Pipe diameter is 100mm, nozzle diameter is 10mm Very Happy









Now to hope my pump is powerful enough Neutral

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Re: Starting on my own nozzle ..

Post  Things on Mon Apr 12, 2010 2:47 am

OK, just did a few tests in my bathroom. The pump is plenty to run the jet! Yay Very Happy

Although, I do have pump jitter, as expected. The flow isn't as smooth as it has been however, as my main sponge keeps popping out of the tube and blowing out the endcaps! Need to install some rings to keep everything in place, but it works for the most part Very Happy





Interesting effects when I shine a laser into the stream (Waiting for fiber optics to arrive!)


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Re: Starting on my own nozzle ..

Post  liteglow on Mon Apr 12, 2010 8:21 am

Haha..
You must live in my twilight zone !!

I did also glue a brass ring into the end cap, what happen to me was that the ring did pop out.
I have also used end caps, and I have the same problem as you, the end did pop out Wink
So I did use allot of duct-tape to hold it in place..

I did also use my green laser to light up my laminar stream cheers cheers


I still recommend you to use a fatter pipe (bigger in diameter) !
The pipe can be 100mm and 1 meeter long, but the water still have no place to calm down and be laminar.
Because the water speed is always the same all the way up to the top.
More speed= less laminar flow.

So if you use a fat pipe, 200-300mm in diameter. the water will travel at slow speed up.
And the slow speed up will create a nice and calm laminar flow of water Smile


good luck
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Re: Starting on my own nozzle ..

Post  John on Mon Apr 12, 2010 10:51 am

Looks great! Keep up the good work and keep us posted!!!!

Are you just planning on having the end caps glued to keep it shut? Did you create any separation with empty space in the internal layers?
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Re: Starting on my own nozzle ..

Post  Things on Mon Apr 12, 2010 2:20 pm

Hey, the only space at the moment is between the straws and the nozzle. This afternoon I'll make up a few spacer rings so I can have a bit of a gap between the sponge and the straws.

And yeah, I can keep moving up in pipe diameter, although then the end caps start being a pain to mount on the tube Neutral

Also, why do you guys use seperate tubes up the middle to run the fiber optics? Wont just shoving it up a straw near the nozzle work?

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Re: Starting on my own nozzle ..

Post  John on Mon Apr 12, 2010 2:32 pm

My setup doesn't have a tube for it. Basically mine is just right up the middle in the straws. It works, but it is hard to get it to shine exactly in the center of the nozzle. The plus side to having something rigid in the center is that you can adjust the light output a bit easier.
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Re: Starting on my own nozzle ..

Post  Things on Mon Apr 12, 2010 11:50 pm

A bit more testing:



Works quite well apart from the pump jitter breaking it up a bit, but I dont have the parts for a lowpass filter laying around ATM Sad

Can't wait to get some fiber optics into this thing! Is plastic fiber fine? It's the only stuff I could find on eBay for a reasonable price, at 3mm diameter Smile

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Re: Starting on my own nozzle ..

Post  John on Tue Apr 13, 2010 6:25 am

the plastic, or PMMA is what you need. If you use glass fiber the water will break it down. There have been a couple of people on here that have used glass and it works for a while then the light starts to diminish. I've talked to a fiber optic manufacture and have comfirmed that glass will degrade under water, though I don't know why.
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Re: Starting on my own nozzle ..

Post  Things on Thu Apr 15, 2010 12:59 am

Did a bit more experimenting, found that it prefers the straws closer to the outlet than further Smile

Also got a few more pics:






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Re: Starting on my own nozzle ..

Post  John on Thu Apr 15, 2010 6:55 am

Looks really good. I like the lighting! How are you getting that funky laser lines in it?
How far are your straws from the exit?

And what is the throw of your arc (height, and length)?
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Re: Starting on my own nozzle ..

Post  liteglow on Thu Apr 15, 2010 7:45 am

Your nozzle looking great dude :-)

here is a video of my nozzle testing with my laser http://www.youtube.com/watch?v=Hg33LmJvxOw
When I receive my fiber optic, i will try to use my RGB laser into the nozzle .
That can be an impressive result.. 1Watt with light into the water should be cool!
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Re: Starting on my own nozzle ..

Post  Things on Thu Apr 15, 2010 2:57 pm

The lines are a result of the jet having nice clean walls, the light from the laser bounces around between the walls for a while before it diffuses throughout the whole jet.

Straws from the exit, I'm not completely sure, didn't measure, but it'd be around maybe 3cm or so. If I move them too far back, the stream becomes turbulent again.

Arc size, Haven't measured, but with the pump turned down (Up full the stream breaks up just near the end) it jumps a good 1 metre high, and maybe 1.5m-2m long.

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Re: Starting on my own nozzle ..

Post  John on Thu Apr 15, 2010 3:03 pm

That's got to be one of the coolest examples of refraction (or reflection) that I have ever seen!!!!

You've got to build a pump filter, they can be very simple. It will allow you to open the pump up to its full capacity (or at least close to it). Keep up the good work.

3cm huh. Mine is back a lot further. Somewhere around 30cm. Next time I'll try bringing mine closer to the exit.
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Re: Starting on my own nozzle ..

Post  Things on Thu Apr 15, 2010 3:26 pm

Yeah, this weekend I'll go out and grab some stuff for a lowpass filter, and also a nice valve for the pump. The one on the pump limits the water inflow, I have a feeling it'll work better if I limit the outflow.

The straw distance could have something to do with the diameter of my pipe. It's not very wide so moving the straws further back probably gets the water going too fast again.

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