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Old 05-05-2005, 03:34 PM
masterp2 masterp2 is offline
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Join Date: Nov 2004
Location: Desert SW, Arizona USA
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To answer this, a concept should be explained. A water droplet has a strong affinity to combine with another to form a larger drop. It is seen when you put 2 drops on wax paper, sufficiently close, they will pull together. Surface tension, a science term, is what is doing this. Some covalent bond on the molecular or something...

The problem with a conduit is that it provides an environment ripe for collisions, so as to be counter to what we are trying to achieve. What we are trying to achieve is lowest particle size=maximum surface area of water. The surest way to do this is to spray a lot of water onto a solid surface, like a wall mounted nozzle spraying 90 degrees to air flow. There is a film clip I found that shows just how inneffective this is for evaporation, but very effective for recombining atomized liquid.

There are those that feel that the major cause of blade damage is from large recombined amounts of liquid streaming into the blade. Although government research has shown impingement damage from extensive use in power generating applications using small micron misting, but it must be acknowledged that these applications use injection 100% of operation, with turbines spinning 24 hours a day. We would employ it for less than 1% in a street application, only to enhance top end power and cooling. So long as siphoning is eliminated as a source of potential injury, a good injection method should show no measurable damage over the life of a vehicle. My opinion. That leaves how I would define a good method, your question. Approaching it with these things in mind, if I wanted significant evap cooling prior to the blades, I would line up an infinite number of infinitely small nozzles, spraying into the airstream. All the nozzles would be located in the center of the conduit, yes. Now back to reality, this is not practical, and further, if evaporation prior to the blades is not a goal, then more simple. Spray right onto the blades, with the airstream. There is no chance for water to recombine.

You might consider a combination of techniques. A small nozzle spraying directly into the turbo, and back-to-back nozzles on a T, spraying from the center, located as far upstream as possible. Utilize at least 100 psi, and an effective fogging type nozzle, should get mean particle size down to 50 micron.

If you can get ahold of 500-800 psi, you can have real fog of the 20 micron variety, which will damage nothing. But you have to use nozzles designed for that purpose. Most stuff on the w/i circuit is low pressure, and avg spherical sizes are well over 100 micron in reality.
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