For typical 60F tap water the minimum vacuum obtainable is about ~20 mmHg (~0.03 ATM). The vacuum attainable is limited by the vapor pressure of the water, which is dependent on the temperature of the water. It works for some applications, but not as good as a vacuum pump. Jackssmirkingrevenge wrote:We have a similar system to generate vacuum in the lab, attached to the water tap. Sweetbayeater.JPG (33.12 KiB) Viewed 17209 times here, here, and here all offer a lot of information about a venturi effect in a convergent/divergent pipe application. There are venturi equations, but adapting one to and incompressible fluid mixed with sand, rocks and god-knows-what is not easy. Now this is a pretty cool concept, but there is little in the ways of math that I can find on the internet that are specifically applied to this sort of setup. It is the most efficient design due to its radial water injection. The second is a concept called and Infinity dredge and is what I'm still working on bringing it to life. Its fed by a 4" pump that runs 750gpm 52 psi. This is where I started my research and got many ideas from. My boss asked me to do some reading on venturi dredging. Some of the guys from work have 2 camps off the Atchafalaya River on Sweet Bay Lake, or "The Sweet Bay Lac" During Duck season, the mouth of the canal that leads to the camps has been filling in over the years and its to the point that ist almost impassable without a go devil. Since my recent cannon-related run-in with the law, I've taken up another project which is legal and still uses my knowledge of pvc fittings.
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