Swedish DIY venturi

**Professor Myers** · 10-07-2006, 11:45 PM

1. 55* input 15* output 7.9375 at the throat. 4.7625mm dia. X 1.5875 depth for the opposing pressure well, and 6.35 dia. on the gas intake. OOP !

1. 55* insatsen 15* produktionen 7.9375 på halsen. dia. X 1.5875 djup för den mitt emot tryck brunn , och dia. på det bensin intagen.

Metric ! WTH ?

**peterhaack** · 10-08-2006, 06:50 PM

HAHA love the translation you are telling me to use Gasolin in the gas inlet haha..

well the diameter inside of tube
1. is 21mm and in the middel(thin part of the tube) it 8mm and the inlet for gas is a 6mmtubing with inside diameter on 4mm.

Lazy as i am i haven tested it yet but hmm maybe i should, ah well there comes another day tomorrow.

2. is 17mm and in the middel(thin part of the tube) is 6mm and same gas inlet.

Do you think that will work as a venturi and will it make small gasbubbles if it does maybe it will be a good ide to blow in to the reaktor, what do you think about that Proffesor M

**Professor Myers** · 10-08-2006, 08:42 PM

I guess any gas is as good as another ???

My first impression was that your diameters were very Very Close ! The difference lies in controlling the tapers of the inlett, and output. This is nearly impossible to control by thermo forming pipe without a constricting mold to limit the expansion.

Secondly: For our purposes (Co2 Injection) we require a greater gas intake velocity, and a smaller orifice. The smooth transition of the stretched taper is actually an impediment. We require a sharp edge to the throat, and an increased pressure differential to chop up smaller bubbles of gas. (Carefully study the Mazzei Illustration) pay close attention to the offset diameter of the opposing pressure well. Mazzei Injector Corp. - How a Mazzei Injector Works This forces the stream to turn/cut across the intake port ripping the bubbles from the orifice. If the intake jet has a sharp proud edge it will punctuate the portion of gas more effectively, but there is a very fine point of adjustment before it actually impedes the flow, and decreases the liquid velocity. (This is why I used an 1/8 bulkhead to sleeve the capillary tube) it's threaded and has a nut on it to raise or lower the intake within the throat. I'm just lucky that it reinforced the tube or it likely would have burst as Tom pointed out ! ;^)

Combine this with a lower flow rate to sustain the reaction, and a significantly smaller volume of gas, and the task becomes a formidable challenge.

We can decrease and meter the gas intake, but we still require a significant shear force to tear the bubbles from the orifice.

The process is a vast contrast to O2 or O3 injection.

Last point of observation is that if you accomplish these goals a reactor is almost un-necessary. Tom's greater point being that we may not want to contain the reaction at all, but distribute the confluent to the tank creating a gaseous interface of Co2 through the micro bubbles, and the plants.

I've tested dissolved Co2 against misting, and those plants that enjoyed the introduction of Co2 micro bubbles thrived by comparrison. (Tom makes a Very Good Point)

So long as we are designing a more efficient diffusion we may as well finish the job, instead of resuscitating the aborted shortcomings of prior methods, and systems.

I DO understand that you're trying to refine a simple production process of fabrication, but don't lose sight of the larger picture. You may very well succeed, only to show up a day late, and a dollar short of the ultimate goal !

**peterhaack** · 10-08-2006, 09:39 PM

Well im not doing this thing to make moe, i did this thing becuse some were doing it so complicated with drilling and stuffing pipes with cement to drill exact holes, wich seems to have taken some time =O)

I did just take a simpel plastic tube and heated it up in the middel and the pulled voila 2min of hard work puh...and i did some diffrent sizes =O))

I did an experiment now in the evening and since we are using pressurerised gas( we really dont need the sucking) when the gas bobble came out it was sort of vaporised out of the venturii so they seem to work =O)) BUT when there were no bobble it was just shoting ......water =O)
If it will work in long term i dont know, but for 2min of work and some cheap plastic tubing it was easy.

**Professor Myers** · 10-08-2006, 09:54 PM

and I completly agree. It takes me 20 Min. to machine the parts from scratch, but given my hourly rate it's cheaper for me to source the Mazzei Injectors, and modify the gas intake. This becomes more critical for folks using yeast reactors, and only increases the efficiency of tanked gas. It also becomes increasingly important for low pressure "Powerhead" systems. Not everyone wants the expense of tanked Co2 or expensive pumps, and not everyone wants a reactor in their system. Yet the cost of an improved venturi is just slightly higher than a ceramic diffuser, and they have lower maintenance. Savvy ?

Face it. Once you've shelled out for tanked gas a $25.00 injector becomes rather trivial bye comparrison. So If others can benefit from the same system without the expense, Good For Them !

For the Record I'm retired. I don't make one red cent off of this The process has cost me time and money. That's why I won't post pics to the web. Many fine contributors of this forum have done that in the past only to have someone pirate the very design they provided the community for free. Put it into production, and sell it retail. The punch line gets even better when folks purchase the product, and come right back here for advice, only to gripe about a membership fee ??? Just Imagine The Irony ;^))))) BWAHhahahahhahahhahha.

**Sintei** · 10-09-2006, 12:55 PM

For those who wants to show off.. This is available in glass entirely!

VWR International

**Professor Myers** · 10-09-2006, 05:44 PM

Originally Posted by Sintei

For those who wants to show off.. This is available in glass entirely!

VWR International

Please let us know how it works out for Co2 injection in aquariums

**Sintei** · 10-10-2006, 08:09 AM

Sorry to say, but Im not going to test it right now. I just finished my external DIY-reactor and it works like a charm. ALGEA BE GONE! Since I used a "ADA style" diffusor (actually mine is better that ADA

) in it, it doubles as a misting device too, pumping out all the smallest bubbles straight to the tank. Leaving the bigger ones to dissolve inside the reactor.

**Professor Myers** · 10-10-2006, 09:24 AM

One of the advantages of the internet, and international forums is greater exposure to more markets, and technologies. The more the merrier ! We are in a position where many of the prevailing products have room for improvement. Sometimes you get lucky and arrive at a serendipitous blend that works out. Unfortunately that's the exception to the rule.

I'm looking for a simpler method of distribution that works for more people in general. The hobby shouldn't be limited to a privileged few, and Co2 is a key component to their continued success. Certain products are expensive, cumbersome, and maintenance prone. Human nature relegates those products to the weakest link in the chain. Grtz. Prof M