Previous in Forum: Centrifugal Pump Impeller Size   Next in Forum: Precision Food Cutting Machinery
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
11 comments
Rate Comments: Nested
AKUR
Active Contributor

Join Date: Aug 2009
Posts: 12

Flow control

02/01/2012 12:02 PM

Hello everyone,

I am working on a hobby project and I have two flow streams. I need that the flow in srteam 1 be a percentage of the flow in stream 2. I am looking for some exquipment or a set-up that would make this possible.

Any help/ideas would be appreciated.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: Flow control

02/01/2012 12:23 PM

Flowrates? Material in the streams? Open channel or pipe? Temperatures? Pressures? Materials of construction of the conduits?

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#2

Re: Flow control

02/01/2012 12:59 PM

Great

When you feel like you want to provide us some specific details on this project or you run into a specific difficulty on this project, tell us what you'd like us to discuss. This sounds like an interesting project.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply
AKUR
Active Contributor

Join Date: Aug 2009
Posts: 12
#3

Re: Flow control

02/01/2012 2:08 PM

F1 =oil, 10GPM, 150F, 175 SSU viscosity, SST pipe

F2 = water, F1*14%, ambient temp, 20psi, teflon hose

Thank you in advance !
Register to Reply
DaveR
Commentator

Join Date: Apr 2008
Location: Rhode Island, USA
Posts: 56
Good Answers: 5
#4
In reply to #3

Re: Flow control

02/01/2012 4:41 PM

What you are looking for is called a flow ratio controller. and is a standard function of many process controllers.

Googling "flow ratio controller" should get you a selection.
Register to Reply
Hilton
Guru

Join Date: Jun 2011
Location: Mossel Bay, SA
Posts: 777
Good Answers: 21
#6
In reply to #3

Re: Flow control

02/02/2012 2:51 AM

Assuming:

1. the pressure in both streams is equal and constant,

2. the hoses for each stream are of similar diameter,

3. your "ambient" does not vary too much , and

4. there is no need to monitor, or change the ratio value once set....

You might get away with installing a restriction orifice at F2 . Try pipeflowcalculations.com
Register to Reply
Hilton
Guru

Join Date: Jun 2011
Location: Mossel Bay, SA
Posts: 777
Good Answers: 21
#7
In reply to #6

Re: Flow control

02/02/2012 3:57 AM

Correction: You might get away with installing a restriction orifice at F1
Register to Reply
Wal
Guru

Join Date: Jun 2011
Location: Phnom Penh
Posts: 4019
Good Answers: 102
#5

Re: Flow control

02/02/2012 1:44 AM

Mixing oil and water at 10GPM......

Interesting hobby you have there. Tell us more about the end use of the colloid.

__________________
 Difficulty is not an obstacle it is merely an attribute.
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#10
In reply to #5

Re: Flow control

02/02/2012 5:52 AM

Mayonnaise?

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
Wal
Guru

Join Date: Jun 2011
Location: Phnom Penh
Posts: 4019
Good Answers: 102
#8

Re: Flow control

02/02/2012 4:10 AM

Some sort of venturi arrangement springs to mind.

I'm assuming that the two are combined. They may not be. They could have independent destinations and just require proportional delivery.

More info please AKUR. Coming up with solutions in open loop mode is tough.

__________________
 Difficulty is not an obstacle it is merely an attribute.
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#9

Re: Flow control

02/02/2012 5:52 AM

Another possibility is a peristaltic pump with two drives: speed ratio between the two, or two differently-sized hoses driven by one roller-shaft.

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply
vsar
Guru
United States - Member - Born, raised halfway 'round .....

Join Date: May 2010
Location: Metro.Manila, Philippines.
Posts: 1269
Good Answers: 27
#11

Re: Flow control

02/02/2012 8:01 AM

A properly sized pitot tube may suffice your need ...

__________________
 vsar
Register to Reply
Register to Reply
Have a Different Question?
11 comments
Copy to Clipboard

Users who posted comments:

AKUR (1); DaveR (1); Hilton (2); PWSlack (3); redfred (1); vsar (1); Wal (2)

Previous in Forum: Centrifugal Pump Impeller Size   Next in Forum: Precision Food Cutting Machinery

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (66 right now)
Show Members
Advertisement