×
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

Total Pressure In Branched Ducts

Total Pressure In Branched Ducts

Total Pressure In Branched Ducts

(OP)
Hi, I believe this is the right place for this...I am wondering if you have a duct that splits into two seperate branches then how does the total pressure in the original duct relate to the total pressure in the two branches?  Does Po = P1 + P2, Po = P1 = P2 or some other relationship?

Thanks

RE: Total Pressure In Branched Ducts

No, pressure in the main duct is the exact same as pressure in the branch ducts (Pascal's Law). With air flowing however, pressure in each downstream branch will be slightly lower due to friction losses. You're thinking of flow. Flow in the main will equal the sum of the sub-branches.

RE: Total Pressure In Branched Ducts

(scratch the Pascal's Law statement - similar concept meaning pressure will be equal throughout barring flow, but Pascal's is applicable to incompressible fluids)

RE: Total Pressure In Branched Ducts

Actually, if the branches have a smaller diameter, the pressure on them will be lower right from the start. For the exact same reason Chasbean1 quoted. Being a compressible fluid, the pressure will drop due to the diameter (and direction) change.

<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying " Damn that was fun!" - Unknown>>

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