Designing a venturi?

Question

Hi all -is there somewhere with information on the design of a venturi to produce suction or vacuum ?We're trying to make a vacuum cleaner using compressed air and a coaxial venturi and figuring out how big to make the parts and what size ratio gives the best suction is turning out to be a problem.A google turns up tons of venturi information but I couldn't find a design formula relating orifice size, main tube size and restriction size along with inlet pressure or flow rate.Any pointers would be helpful...Thanks in advanceCarlaSkilled politicians, like high-end hookers, are only for those who can afford them.  Michael Pearce

Bob · Accepted Answer

Is this what you're looking for?

Richard J Kinch · Answer

Would be nice to know what pressure and flow rate you had in mind.

Jim Stewart · Answer

You might look at carburetors.  Most old internalcompustion engine books have a section on theventuri portion of a carb.  What you're reallyinterested in is the Bernoulli effect in a cylindricalform.

oldjag · Answer

I would try a Perry's or a Mark's engineering handbook.  They probablyhave the formulas you can need for sizing.

Richard J Kinch · Answer

Puh-leeze.  Two numbers constitute an NDA and a patent?  Contemptible coyness.

Bruce L. Bergman · Answer

I don't think it's quite that bad, but my guess would be in the 3% to 5% range, maybe 10% if all the stars and planets were aligned. Which still sucks rocks -

Unless you have "free" energy like waste compressed air by the ton and extreme space restrictions on the vacuum generating equipment (and I can't see those two existing at the same time), you'd be much better off using another energy source and/or vacuum generation method.

Hell, modifying a IC Engine turbocharger to take the air energy from the exhaust turbine and use the compressor section as a vacuum blower would probably be more efficient than a venturi.

About the only tricky part would be supplying a small lubrication pump and a 1-quart lube oil tank for the center section bearings, and keeping it powered after shutdown for spin-down lubrication - and if it isn't being run by exhaust gases heat is not an issue. You get a bit of compression heating, but that's nothing compared to the design temps on the exhaust side.

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Designing a venturi?

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