INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Aeration Measurment System in Hydraulic Flow Circuit

Aeration Measurment System in Hydraulic Flow Circuit

(OP)
I have a small hydraulic flow system in an aerospace application.  I need an aeration measurement device to measure entrained and dissolved air in the hydraulic fluid as a function of different operating conditions.  I anticipate aeration to be between ~1% and ~10% by volume.  

I need help finding a measurement system or device for work in my lab.  Can anyone provide recommendations?  

 

RE: Aeration Measurment System in Hydraulic Flow Circuit

2
How about just measuring the bulk modulus of a sample?

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Aeration Measurment System in Hydraulic Flow Circuit

(OP)
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

RE: Aeration Measurment System in Hydraulic Flow Circuit

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

RE: Aeration Measurment System in Hydraulic Flow Circuit

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close