Venturi Design

I am looking for an eductor design. ..... You have answered what i am looking for theoretically i.e highest possible Mach no. of the inlet fluid is what we should design for. ..... Are there any thumb rules in the taper design. ..... My application is for a domestic appliance where the flow rate is not very high and hence i need to create the maximum suction at the throat.

Like PWS asked - what is the use to be?

Correctly designed inlet/outlet cones never have the same angle that I have seen.

Perrys and Marks (as I remember) plus a Shell Oil design guide are definitive guides for venturi design.

Hi Russ,

I've had a look on Google for both the Shell Oil guide and "Marks" publication, but haven't turned anything up as yet. Do you have any more details for these references ?

Thanks

DesEng

Marks' Standard Handbook for Mechanical Engineers

I also searched for the Shell book that I mentioned and found nothing. I had a copy years back but it is long lost. I the topic was flow measurement of all types with one section on venturis for flow measurement.

As you are interested in an ejector stack the Marks would be more useful. They are quite useful if you can afford the power required.

if it is for measuring the pressure difference then refer to the HVAC hand book

I am looking for an eductor design. ..... I guess PWS has answered what i am looking for theoretically i.e highest possible Mach no. of the inlet fluid is what we should design for. ..... Are there any thumb rules in the taper design. ..... My application is for a domestic appliance where the flow rate is not very high and hence i need to create the maximum suction at the throat.

I apologize up front since I haven't college or much of any formal training. But the fellow is asking for maximum performance - all the time! However no one has mentioned that in order to get max with a 'set' configuration - the pressures need to be steady on each side of the venturi. Because different pressures on either side will mean different requirements for maximum performance. I suppose you then need to consider tuning ports to balance things out. Good luck. Carlos

Hello,

You can get the right design by using "CFD" based tools.

Regards

Madhav Chowdhary

SWEE Technologies

Pune city, India

Thanks. This was useful.

Glad to of help.

and glad to notch up my first GA

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