Instructables

how do build an atomizer nozzle?

we were wondering how to build a heatresistant atomizer, it doesn't have to be fancy or anything?

itcanbedone4 years ago
I would suggest using a stainless steel atomization nozzle typically used for industrial atomization humidification.  These nozzles typically have a .006" orifice.  They can handle an extreme amount of heat without fail. 
jtobako4 years ago
What other items do what you want?  The sprayer end of some hose fittings (cone-in-cone with a small gap), a pump spray bottle with adjustable end (tiny hole, not sure of exact specs : P ), a spray paint can, ultrasonic vaporizer, a cold-mist vaporizer (water on a spinning disk)...you could even look at old fashion pump/gas torches, where the end was pre-heated to help vaporize the stream of liquid coming out.

If the liquid is too viscus to vaporize threw a small hole, then maybe if the stream hits a barrier to break up the droplets (like in the drip oil-burners in some pottery kilns).
lemonie4 years ago
Re-design is suggesting this

I ask what is the liquid, because it will make a difference? L
keijemosch (author)  lemonie4 years ago
we can't use the venturi effect because we can't have an airline there, it's gonna be a bit high temp for that, also, the flame starting at the source is not a problem, since its not anywhere near people or a fuel tank, we're currently using lampoil as fuel, we can however deliver pressurized fuel...
That's why I was asking about the liquid. Have you seen the oil-fired furnace instructables, and are they anything like what you want?
Waste-Oil-Furnace-For-Melting-Metal
Waste-Oil-Forge-and-Foundry

L


keijemosch (author)  lemonie4 years ago
that's not gonna work, as the flaming point is 100 degrees celsius. so we really nead a sort of mist. we need a more volatile combustion, and we cannot really use very volatile fuels as the peeps will nag about it. 

we are building a pulse jet btw
Right, now we know what you're up to. Start it on propane, then when you've got it running the whole thing will be red-hot and the oil less viscous. You'll want a very narrow nozzle (or several) and a pump. Although if the hot device vapourises the fuel you might get away with something more crude.
Technical paper on oil-mist injection

L
Exactly!  Nice graphic.
Koosie4 years ago
Do you mean something like a fuel injector but with a constant spray?
keijemosch (author)  Koosie4 years ago
exactly
I see you're building a pulse jet.  From my understanding of the pulse jet, a fuel injector is exactly what you need.

Attached is a picture of a valved pulse jet engine (1 = air, 2 = fuel, 3 = valve close and bang, 4 = exhaust).

An injector can handle extreme heat, pressure and sprays hectic fine.

Grab one cheaply at a scrap yard, wire it up and there you go.
Pulse_jet.png
Re-design4 years ago
An atomizer is just a tube directing blown air over the end of a suction tube.

An atomizer does not make a very good flamethrower.  The problem is that all the fuel vaporizes at the source and the operator gets burned.  So what you're think is probably going to backfire.