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Vortex Breaker design

Vortex Breaker design

Vortex Breaker design

(OP)
Why do some liquid vortex breakers have caps on top of the usual cross type design? what is the advantage?

thanks for any help

RE: Vortex Breaker design

As a vortex is vertical gaseous vena that extends from the outlet to the surface of the liquid, the plate will stop it from forming.

prex

http://www.xcalcs.com
Online tools for structural design

RE: Vortex Breaker design

(OP)
But wont the crossed plates on top of the outlet pipe do that? why add the cap? does it make much difference if the cap is there or not?

RE: Vortex Breaker design

Yes, it makes a difference, as the vortex may pass through one quarter of the outlet hole: it will possibly be smaller, but still existing.

prex

http://www.xcalcs.com
Online tools for structural design

RE: Vortex Breaker design

(OP)
makes sense. thanks.

do you know of any available literature which details the pros & cons of different designs of vortex breakers? or of any research available?

RE: Vortex Breaker design

I think you are seeing a combination of two different vortex breaker designs.

The first is a crossed plate inserted into the throat of the outlet pipe in a tank; the length of which is roughly 1.5 times the diameter.  This works best if the outlet pipe is on the side of a tank.  A design guide is "ANSI/HI 1.1-1.5-1994 Centrifugal pumps for Nomenclature, definitions, applications and Operation."  No design dimensions are given, pointing out the "seat-of-the-pants" origin of this device.

Alternative:
If the outlet from a tank is on the bottom, a baffle plate can be placed over the mouth of the pipe.  The rough dimensions are as follows:  The outlet pipe diameter is "d" (known), the baffle plate diameter is "4d", and it is placed a distance "d/2" from the outlet pipe.  Installing the baffle plate above the pipe opening will simulate a larger intake area, thereby reducing the vortex and air entrainment.  

The crossed plate will work okay for a bottom-mounted outlet pipe too.  A crossed plate with a cap sounds like a home-brewed solution to vortex breaking.

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