Flow control

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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.
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PWSlack Guru 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: 32127 Good Answers: 838	#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
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15514 Good Answers: 959	#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
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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 !
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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.
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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
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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
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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.
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PWSlack Guru 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: 32127 Good Answers: 838	#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
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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.
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PWSlack Guru 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: 32127 Good Answers: 838	#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
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vsar Guru Join Date: May 2010 Location: Metro.Manila, Philippines. Posts: 1233 Good Answers: 25	#11 Re: Flow control 02/02/2012 8:01 AM
	A properly sized pitot tube may suffice your need ... __________________ vsar
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AKUR (1); DaveR (1); Hilton (2); PWSlack (3); redfred (1); vsar (1); Wal (2)

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