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Bret Cahill
science forum Guru
Joined: 05 May 2005
Posts: 480
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 Posted: Sat Jun 10, 2006 3:08 am Post subject:
Re: Steam Mister
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< They are not using the steam as a transport means to carry another
< liquid or chemical- just water.
Water may be all you need.
One humidification company has steam humidifiers and compressed
air/water nozzle humidifiers.
It's surprising that they don't have steam/liquid water.
Bret Cahill |
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Dripnot
science forum beginner
Joined: 09 Jun 2006
Posts: 1
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| Posted: Fri Jun 09, 2006 9:37 pm Post subject:
Re: Steam Mister
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Bret Cahill wrote:
| Quote: | Has this been done before?
Instead of using compressed air to transfer momentum to a liquid as in
paint sprayers or some industrial humidification misters, why not use
steam?
Superheat the steam enough so that it will be just saturated as it
mixes with the liquid. If the steam - liquid mixture was further
expanded in a nozzle some of the sat. steam would turn into liquid
droplets as well, depending on the sensible heat of the liquid.
It might create a neat splatter effect applying some paints.
Even more important are those situations where you don't want a lot of
air mixing with the liquid.
Bret Cahill
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Brett-
The reference you provided (US006962296) is about using steam to
distribute superfine droplets of water to a surface, in this case a
paper web process. Of course steam droplets are going to be finer than
simple misted or sprayed water, that's what the referenced patent is
about- an improved method of applying water droplets over prior art.
They are not using the steam as a transport means to carry another
liquid or chemical- just water.
Most paints (even latex, water based) will probably not work with steam
as a transport means. At certain temps, solids within the paints will
congeal or coagulate, clogging any nozzle tips.
Also, steam exits the nozzle at a much higher temp than the surrounding
air or surface to which the paint would be applied, causing further
application problems. Most professional paint application systems have
in-line dryers or evap systems to *remove* any traces of water in the
air lines. In short, I do not see steam being used to deliver paints
or pigments that do not operate well with elevated temps, and or the
presence of water.
Good luck! |
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Bret Cahill
science forum Guru
Joined: 05 May 2005
Posts: 480
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Bret Cahill
science forum Guru
Joined: 05 May 2005
Posts: 480
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Bret Cahill
science forum Guru
Joined: 05 May 2005
Posts: 480
|
| Posted: Fri Jun 09, 2006 6:22 pm Post subject:
Steam Mister
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Has this been done before?
Instead of using compressed air to transfer momentum to a liquid as in
paint sprayers or some industrial humidification misters, why not use
steam?
Superheat the steam enough so that it will be just saturated as it
mixes with the liquid. If the steam - liquid mixture was further
expanded in a nozzle some of the sat. steam would turn into liquid
droplets as well, depending on the sensible heat of the liquid.
It might create a neat splatter effect applying some paints.
Even more important are those situations where you don't want a lot of
air mixing with the liquid.
Bret Cahill |
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