Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculate the flow velocity

  1. Jul 7, 2013 #1
    This might be simple but I can't remember how to do it.

    problem: we have 2 tanks. One filled with atmospheric air at 1 bar and the other is vacuum. The two tanks are connected by a rigid pipe which has a valve. I open the valve and air flows to the vacuum tank. How do I calculate the air velocity?

    P.s: I don't think Bernoulli is valid here because the flow isn't steady I guess. Please state your assumptions clearly.

    Thanks in advance
     
  2. jcsd
  3. Jul 7, 2013 #2

    Baluncore

    User Avatar
    Science Advisor

    Flow velocity depends on the thickness and length of the pipe, and on the temperature of the air.
     
  4. Jul 7, 2013 #3

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    2015 Award

    Instead of 'thickness' of the pipe, the term 'internal diameter' would be more apt.
     
  5. Jul 7, 2013 #4

    boneh3ad

    User Avatar
    Science Advisor
    Insights Author
    Gold Member

    Also pay attention to the pressures. The flow is going to start off choked but will eventually un-choke as the pressures equalize.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted
Similar Discussions: Calculate the flow velocity
  1. Velocity of heat flow. (Replies: 27)

Loading...