"Wetting Pressure" is sort of a misnomer, you are actually determining what's called "bubble point". Bubble point is driven by several factors. The contact angle of the liquid is influenced by what the solution makeup is. Water has one contact angle, alcohol has another, and other materials and mixtures will something else. Contact angle can be looked at as how much a drop of liquid will stand up on a surface, which is a function of it's surface tension. A drop of pure water will stand quite high if placed on a hydrophobic surface, and a drop of alcohol will "spread out" and be flatter on same material generally. It's good to know that this is basically how soap works... when you add soap to water, it makes the water "wetter", and drops the surface tension, lowering the contact angle. This allows water to overcome surface tension, and sneak into the smallest pores, thus improving the ability of water (or any other solvent) to "lift" the dirt out easier and wash it away. So the porosity of a material (the stone in this case), the contact angle of the solution (determined by solution makeup), and the pressure used during testing is really just measuring the pressure required to overcome the surface tension that is holding the liquid in the pores via capillary action. There will be little bubbling (just via diffusion) that will take place until you overcome the threshold, and then an avalanche of bubbles will occur, and that is the "bubble point". This is how most filter's average pore size is determined during manufacturing, as you can solve for pore size if the other factors are known. You can find several variations of the formula online if you're curious.

@tybrewing9807

4 ай бұрын

A lot of great information here. Thanks so much for taking the time to explain it all! I’ve pinned your comment so others can see it as well! Cheers!

@terrysaunders8222

4 ай бұрын

@@tybrewing9807I may have worked in the filtration business just long enough to become boring, lol. Hope it sheds a little light on the hows and whys. Take care.

Wetting pressure depends on hidrostatic pressure so what you calculated there is 1psi/4qt 0.25 psi per qt of water/beer so if you want the psi needed to get the stone working on a 5gallon fermenter you just multiply that

@tybrewing9807

2 жыл бұрын

Thank you for this! I knew there was an equation involved in the process but I forgot to include it in the video. Definitely an important detail! We typically just run carb sets and then check with a TapRite/Zahm gauge but this is crucial if you want to just set it and forget it or don’t have access to that sort of equipment.

First stone should be in the same orientation as it will be in the tank, second head (hydrostatic) pressure has nothing to do with quantity of beer it’s how far the stone is submerged 1psi per approx. 28 inches and third don’t control the flow of co2 with a regulator, get a flow meter with a valve. Wetting Pressure + Head Pressure + desired Equilibrium PSI = Carbonation Pressure

@tybrewing9807

2 жыл бұрын

Thank you for this comment. I had intended to expand upon (and correct) the information in this video when I uploaded my video on how to carbonate beer using a carb stone but I missed the mark. I’ve pinned your comment so people can use it as reference. Definitely important info, especially when scaling up to commercial scale

Hi Taylor I have question how you are able to produce very tiny bubbles and can we use other gases like compressed air , oxygen or nitrogen?

@tybrewing9807

8 ай бұрын

The tiny bubbles are caused by the carbonation stone. The stone itself has tiny perforations in it. It is intended to be used in a uniprocess fermentation vessel for brewing beer. You can run multiple types of gas through the stone, but its intended use is for CO2. You could in theory use a carbonation stone to oxygenate wort once it has been sent to a fermenter, prior to fermentation, but most people add O2 in-line while sending wort to their fermentation vessel. Hope this helps and isn’t too confusing. Let me know if you have any questions.

@RanaHamza-iv2wj

8 ай бұрын

​@@tybrewing9807I did the same, as you did in the picture but still I am not able to produce at tiny bubbles , I could only see the big bubbles very big bubbles, I have tried different things like pressure and flow rate but still not able to see that tiny bubbles as you are producing. Please if you could help me it could be a great favor.

@tybrewing9807

8 ай бұрын

@RanaHamza-iv2wj Oh, I see. I believe the difference you are noticing is because the liquid in the video contains Star San. It’s very bubbly. If not that, then maybe because I am running into the stone at a rather low pressure. It’s difficult to troubleshoot why the bubbles would be a different size but that’s my best guess.