Liquid ejector design

[supertrinity]

I have to find the best way to design an ejector. To test the methods in the articles I've found, I need dimesions and process parameters of existing ejectors. The big problem is finding the internal diameters.

Can anyone tell me where I can find this data to test ejector calculations? data of ejectors used for experiments are also useful

 

[Torricelli]

pls refer to thread798-105393

ET

http://www.vacuum-guide.com

 

[oxilume]

Dear Supertrinity,

First, why do you want to reinvent the ejector. The internal dimensions for ejectors is not something an ejector manufacture likes to disclose. That is why many manufactures cast ejectors. However, you can purchase one and cut it in half and measure it. But then why not just buy it and use it.

In addition, designing an ejector or venturi eductor requires a tremendous amount of bench testing based upon the "application" for the ejector.

For example, if the ejector will be used for aeration, then you will have to conduct a standard oxygen transfer efficiency test. The companies that are set up to conduct this test are few and far between. Be ready to dish out upwards of $5,000 US.

So, first you need to specify your application for the ejector in order to help solve your ejector problem.

Or contact someone that makes eductors/venturis/ejectors/injectors etc.
see

http://www.oxilume.com

http://www.elastech.com

Sincerely,
Todd







Todd

http://www.oxilume.com

 

[mbeychok]

Supertrinity:

I would suggest that you contact www.graham-mfg.com/index.html for their help.

Milton Beychok
(Contact me at www.air-dispersion.com)

 

[Montemayor]

supertrinity:

Confront reality.

Some of the best engineering minds you could attract - such as Milton Beychok, Torricelli, etc. - are leveling with you. If you "have to find the best way to design an ejector" you have probably stumbled into the best, practical, and experienced engineering recommendations from these fellows.

Face the facts. No one - even you - is going to have any serious engineering faith in your first ejector design. Obviously, you've never designed one before; that's why you're probing for help. It takes money, money, & probably more money to develop a credible, reliable, and recommended design of an ejector. And then after going through all this, you have to confront a worse reality: there are already existing, recognized, proven, reliable ejector suppliers out in the market place. Why would you consider it worth your while to complete with the likes of Graham, Penberthy, etc.? This doesn't make engineering sense. Heed Milton Beychok's advise...... that makes engineering sense!

Art Montemayor
Spring, TX

 

[supertrinity]

Thanks all, for those really interesting answers.

I'm getting the impression, that the things they asked me to do are underestimated. It surprises me that there are so many people who try to design a ejector using a few formulas without mentioning that those calculations cannot be used for real ejector design.

I already knew that ejector models I have are to simplistic to do a realistic calculation, but I wanted to test how (un)realistic they were. I'm glad that Todd and Montemayor told me what the problems are.

Supertrinity