Designing a venturi?
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 advance Carla Skilled politicians, like high-end hookers, are only for those who can afford them. Michael Pearce |
Designing a venturi?
On Wed, 17 Sep 2008 23:58:27 -0700, Carla Fong
wrote: 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 advance Carla Skilled politicians, like high-end hookers, are only for those who can afford them. Michael Pearce Is this what you're looking for? http://www.spenroaircrafttool.com/sp...uum-p-217.html Bob |
Designing a venturi?
Carla Fong writes:
is there somewhere with information on the design of a venturi to produce suction or vacuum ? Would be nice to know what pressure and flow rate you had in mind. |
Designing a venturi?
Bob wrote:
Is this what you're looking for? http://www.spenroaircrafttool.com/sp...uum-p-217.html Bob No, sorry - see below. Richard J Kinch wrote: Carla Fong writes: is there somewhere with information on the design of a venturi to produce suction or vacuum ? Would be nice to know what pressure and flow rate you had in mind. Unfortunately, the application is covered by an NDA and has 'patent pending' status so I can't really provide the details - but what I am looking for is some general information about designing/building venturi vacuum or suction generators . Reference designs, formulas, etc. Thanks for any help... Carla Is this weird or what? One of our local candidates for mayor has breast implants - his campaign slogan is "Am I serious? Of course! The last eight years have demonstrated that the public is perfectly willing to elect boobs to public office!" http://www.voteforstu.com |
Designing a venturi?
Carla Fong wrote:
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... You might look at carburetors. Most old internal compustion engine books have a section on the venturi portion of a carb. What you're really interested in is the Bernoulli effect in a cylindrical form. |
Designing a venturi?
On Sep 18, 2:58*am, Carla Fong wrote:
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 advance Carla Skilled politicians, like high-end hookers, are only for those who can afford them. *Michael Pearce I would try a Perry's or a Mark's engineering handbook. They probably have the formulas you can need for sizing. |
Designing a venturi?
Carla Fong writes:
Would be nice to know what pressure and flow rate you had in mind. Unfortunately, the application is covered by an NDA and has 'patent pending' status so I can't really provide the details Puh-leeze. Two numbers constitute an NDA and a patent? Contemptible coyness. |
Designing a venturi?
On Fri, 19 Sep 2008 01:53:46 -0500, the infamous Richard J Kinch
scrolled the following: Carla Fong writes: Would be nice to know what pressure and flow rate you had in mind. Unfortunately, the application is covered by an NDA and has 'patent pending' status so I can't really provide the details Puh-leeze. Two numbers constitute an NDA and a patent? Contemptible coyness. Isn't venturi vacuum about 1% efficient? Then you'd need 500HP to get the same flow as a $35 shop vac, I'd think. Nexxxxxxxxxxxt! -- Once we believe in ourselves, we can risk curiosity, wonder, spontaneous delight, or any experience that reveals the human spirit. --e e cummings |
Designing a venturi?
On Fri, 19 Sep 2008 05:22:37 -0700, Larry Jaques wrote:
On Fri, 19 Sep 2008 01:53:46 -0500, the infamous Richard J Kinch: Carla Fong writes: Would be nice to know what pressure and flow rate you had in mind. Unfortunately, the application is covered by an NDA and has 'patent pending' status so I can't really provide the details Puh-leeze. Two numbers constitute an NDA and a patent? Contemptible coyness. Isn't venturi vacuum about 1% efficient? Then you'd need 500HP to get the same flow as a $35 shop vac, I'd think. Nexxxxxxxxxxxt! 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. -- Bruce -- |
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