I'm trying to figure out if by injecting a small air stream into a continuously fed siphon, would the air pressure and thus the temperature drop a significant amount?
I'm actually looking at doing this on a fish tank with an overflow siphon. Right now it's a 1.5" pipe dropping 2-3 gallons per minute a distance of 2 feet.
What I'm wondering is if I can drop the temperature of the water from say 80 to 76 degrees by adjusting things around.
Now my understanding is that as long as I don't inject enough air to break the siphon, then the air that is let into the pipe should drop in pressure/temperature. I'm thinking it's going to break down to either using a big pipe and letting in as much air as I can, or using a collection of say 1/2" pipes with smaller amounts of air. And it's going to depend a lot on the surface tension of the water as to what my air limit would be.
Anyone have any ideas on the math of this?