Ram Pump; Flow Test Validation (3-Ways)

[wtcamer]

I have a feeling it has to do with the way they buffer the output. In some way this has to effect the efficiency of the pumping action of the ram pump. Much like how changing an exhaust or the internal volume of a 2 stroke engine. "Resonance" In something that works on such basic principles and that literally uses resonance to power it I suspect that small changes can yield larger than expected differences.

[kalebwillis]

I think the change in flowrate is coming from a change in cross-sectional area for air lock setup. You can see this by comparing it to the conventional setup and using the equation for flowrate, Q = velocity * area. The cross-sectional of the outlet is much larger than the hose, therefore, increasing the flowrate. You should see this same effect by throttling the valve on the valved setup, but with no elevation head loss, it makes up for it. I would suggest testing this by reducing the outlet area of the air lock setup to match the hose outlet. Hope this helps!

[scorpio]

Perhaps the weight of the water in the elevated hose.

[witchdoctor]

just guessing here, but could it be because of that crate you had your hose in for the conventional method? It looked slightly deformed so maybe enough to add couple of seconds

[richysee]

Velocity of the output water flow in the uphill water hose. That plus expansion of that hose during a pulse providing a buffer effect. The variables at play would be very difficult indeed to quantify.

[MrNhenwood]

With your artificial back pressure device there will be a compression of air in the tube and I think that could be causing a real world change in height. And with the water volumes involved, I don't think that hose friction would make much of a difference. Question. If you put enough pressure to get water 'just' coming out of your artificial pressure device, does that match up with the height with what you would get out of your long delivery pipe at the same calculated height. (You could then move the end of the delivery pipe up until you 'just' get water coming out to give you the exact number. Clear pipe would be your friend here). BTW, thanks for the great content.

[mx]

you kinda look like jesse plemons in the thumbnail, lol

[RDAmidwest]

Physics. Pretty sure it has something to do with physics...