I think the whole point of this method is to do 2 things at once: 1. transfer the wort and 2. aerate it.
However, I have had zero luck with this method and have tried one hole in a smaller tube between 2 larger tubes towards the end, lots of small holes in the top of the tube and placed near the top, run the wort fast, run it slow, run it in between the most I can get is a sporadic inch of bubbles. So..... I just transfer wide open, then hit it with the wine degassing wand (SS) and whip up a 4 inch froth in about 90 seconds. I do pitch my yeast before this. Do you think it gets them dizzy?
I'm sorry if someone has already asked this and I just missed it, but why not just use an aerator like one finds on a kitchen or bathroom sink? I mean, just take one of those and stick it on the end of your hose?
For the Venturi effect to be best, from what I have read, the "hole" needs to be after the smaller diameter and in the place where the pressure change is happening.
Here's how it should look.
__________________ "Beer... Nutritious and Delicious!"
Finally got it figured out. I have a quick connect (female) with a 1/2 hose attached which is about 10 inches long. Then I slid a 3/8 hose into that and drilled a single hole. Tried it this last batch by transferring slow and then wide open on the second transfer. Wide open gave the best results.
For the Venturi effect to be best, from what I have read, the "hole" needs to be after the smaller diameter and in the place where the pressure change is happening.
Here's how it should look.
Bernoulli says static pressure plus dynamic pressure is constant. Since the wort in the kettle has no dynamic pressure since it's (basically) not moving, the static pressure (and therefore total pressure) is 1 atm. Since the wort in the tubing is moving, it has dynamic pressure, so the static pressure in the tubing is less than 1 atm, so it will suck air in (since the air is at 1 atm) regardless of how your tube is shaped. Although, making the tube skinner like in your pic would locally reduce the static pressure further, enhancing the effect.
Bernoulli says static pressure plus dynamic pressure is constant. Since the wort in the kettle has no dynamic pressure since it's (basically) not moving, the static pressure (and therefore total pressure) is 1 atm. Since the wort in the tubing is moving, it has dynamic pressure, so the static pressure in the tubing is less than 1 atm, so it will suck air in (since the air is at 1 atm) regardless of how your tube is shaped. Although, making the tube skinner like in your pic would locally reduce the static pressure further, enhancing the effect.
In layman's terms, speedy things are at lower pressure than slow (or not moving) things.
For those using pumps for the transfer I would think that placing the Venturi hole in the line prior to the pump would produce the effect without the problem of turning the Venturi hole into a sprayer, since prior to the pump the fluid is being sucked and not pushed.
For those using pumps for the transfer I would think that placing the Venturi hole in the line prior to the pump would produce the effect without the problem of turning the Venturi hole into a sprayer, since prior to the pump the fluid is being sucked and not pushed.
Hmmm... and risk that the pump runs dry/full of air?
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