Aeration Measurment System in Hydraulic Flow Circuit 2

• Sep 8, 2010

2
• #2

MikeHalloran

Mechanical

Aug 29, 2003

14,450

US

How about just measuring the bulk modulus of a sample?



Mike Halloran
Pembroke Pines, FL, USA

 

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• Sep 8, 2010

• Thread starter
• #3

jimbod20

Aerospace

Sep 8, 2010

75

US

Thanks Mike.

Do you have recommendations for in-line, sample, real time indication of bulk modulus measure. The total fluid volume in the system is only ~1 gallon. I have many different operating conditions I want to test/sample. I do anticipate entrained air to be ~ 1% for some operating conditions.

Jim

 

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• Sep 8, 2010

• #4

MikeHalloran

Mechanical

Aug 29, 2003

14,450

US

I thought there was an ASTM test method for bulk modulus.

If you weren't interested in that kind of accuracy, I suppose you could install small hydraulic cylinders at sampling points, equipping each with a sampling valve, a vent/dump valve, a force gauge and a dial indicator.




Mike Halloran
Pembroke Pines, FL, USA

 

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• Sep 8, 2010

• #5

patprimmer

New member

Nov 1, 2002

13,816

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Would volume of oil in the storage tank give you an indication.

Regards
Pat
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• Sep 13, 2010

• #6

drwebb

Automotive

Oct 23, 2002

406

US

SAE 982669 describes a setup for doing just what you describe for Automatic Transmission Fluids. You might also look at the test principles behind ASTM D3427 and see if they can be adapted to your setup. For simpler comparison purposes you might want to consider in-line densitometry which may correllate to air entrainment closely enough for the comparison you're interested in.

 

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