×
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!
  • Students Click Here

*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.

Students Click Here

Jobs

Fluid Resistances

Fluid Resistances

Fluid Resistances

(OP)
IF I have a pipe with two restrictions in it (one at each end) each with a different diameter does the resistance change based on the direction of fluid flow?

The case is a hydraulic damper that has a load of 900N to pull and 600N to push, the position change rate is the same in both directions. The geometry is supposed to be identical but due to tolerances there is a chance that one opening is smaller that the other.

Testing on and Instron, Trapazoidal cycle, 12mm/sec to 5mm wait 1 sec, decrease 12mm/sec to 0mm wait 2 sec, Repeat 5 cycles
Record max loads during each cycle.

Any other suggestions as to a cause in the uneven loading would be appreciated.

Theoretically there are no parts moving during the cycling.

RE: Fluid Resistances

What is the orifice geometry?

____ ____
____| |____

Or

____ ____
___/ \___

The first one should be the same with flow in either direction. The latter will have different coefficients for flow in each direction.

RE: Fluid Resistances

The resistance does not change, but resistances are pressure drops and the pressure at any point in the system is = Reference Pressure - the sum of resistances to that point, so the pressure at a point may change radically if fluid direction changes.

I hate Windowz 8!!!!

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