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paresh_career001
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Join Date: Oct 2008
Location: Gujarat, India
Posts: 142

Which Velocity Measuring Instrument Will Help My Setup?

06/21/2013 2:12 AM

I want to find out the actual flow across a rotary valve whose are is keep on changing. As the area changes, flow also changes. I want to measure this change. FLOW IS OSCILLATING (Cyclic). Fluid is Helium and Cycle time is around 0.25 - 1 second. I want to measure the flow rate at each small time step (If I divide cycle time into 100 parts.).

As the flow is product of area, density and velocity. I want to know how to measure velocity? Which instrument will give me velocity after such a small time step? Please provide details.

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PWSlack
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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.
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#1

Re: Which velocity measuring instrument will help to my setup?

06/21/2013 3:38 AM

How about a pitot tube?

It really would help to have some useful real-world data on this thing. Line size would be a good start, as would temperature and pressure.

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leveles
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Join Date: Jan 2008
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#2

Re: Which Velocity Measuring Instrument Will Help My Setup?

06/21/2013 11:33 PM

The most charitably I can look at this is a poorly presented homework. Helium, as a liquid (I presume, by necessity) is CRYOGENIC in a bad way. It is handled by verrry experienced PhD's and their verrrry experienced engineers. Not in need of advice from us.

Poor idea of a discussion.
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sivaa
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Join Date: Aug 2008
Posts: 82
#3

Re: Which Velocity Measuring Instrument Will Help My Setup?

06/23/2013 1:18 PM

How about ultrasonic flow meters ?
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Fredski
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Join Date: Feb 2011
Posts: 7025
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#4

Re: Which Velocity Measuring Instrument Will Help My Setup?

06/25/2013 7:27 PM

@-270C that's some pretty trick stuff, sure you wont freeze your fingers off???
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Fredski (1); leveles (1); PWSlack (1); sivaa (1)

Previous in Forum: Pressure Required to Press Bearings on a Shaft   Next in Forum: rotary engines. e.g. mazda/wankel

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