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Orifice velocity/pressure - requirements for mixing powder into brine
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Posted by: DevonH ®

08/30/2006, 16:23:45

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Hi I was wondering if anybody has any insight in figuring this out. This is the background: we want to mix and hydrate a starch powder into a salt saturated brine. The way we would like to do this is by using an orifice in a pipe with a powder induction hopper connected to the pipe right after the orifice (I know there might be better ways to do this but this is a quick setup). As the fluid flows through the orifice, this will create a vacuum, which will then pull the starch powder into the pipe and mix it into the brine. As the brine velocity increases, the ability of the starch to mix into the brine should be more favorable.

The problem is that we don't know how to figure out how much pressure drop or liquid velocity is required in order to effectively shear this powder into the liquid. I'm guessing that as your pressure drop decreases, the suction of powder into the pipe is going to decrease as well, but I'm wondering if there is some sort of relationship that will give more details on this. One thing that is important to know as well is that as the starch powder comes in contact with brine, it will form fish eyes or clumps of starch powder that are hard to disperse or mix. Therefore it is desirable to obtain the best shear as possible in order to prevent these fish eyes from forming as soon as the powder contacts the brine.

Here is some more info on the setup:

Pipe inlet: 4"
Orifice size: to be determined
Brine specific gravity: 1.2
Brine viscosity: 2 cp
Final brine/starch solution viscosity: 200 cp
Desired Flowrate: 1000 gpm (this could be changed)
The pump we have currently can put 120 psi on the line, but this could be changed as well if required.

Thank you in advance for any help!








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Re: Orifice velocity/pressure - requirements for mixing powder into brine
Re: Orifice velocity/pressure - requirements for mixing powder into brine -- DevonH Post Reply Top of thread Forum
Posted by: zekeman ®

08/31/2006, 12:19:10

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The generic term of the device you are looking foe is called an "eductor". I googled it and found the website shown below. You could find others and get some ideas.

https://www.foxvalve.com/main.htm








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