1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Poiseuille's Law

  1. Jan 29, 2004 #1
    Trouble with a problem. What is the flow rate if a tube consists of two sections, the first with a length of 20cm and radius 0.15cm and the second part with length 1.0cm radius 0.05? with a pressure difference across the entire tube of 3cmHg (p1-p3). (viscosity = 0.801 cP)

    I've tried this and end up with two many unknowns and not enough equations. Can anybody help?
     
  2. jcsd
  3. Feb 1, 2004 #2
    [tex]\dot V = \frac{\pi \, r_1^4}{8\,\eta}\frac{p_3-p_2}{l_{32}}[/tex]
    [tex]\dot V = \frac{\pi \, r_2^4}{8\,\eta}\frac{p_2-p_1}{l_{21}}[/tex]
    Well, just solve this for p2 und dV/dt and you have your result :)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Poiseuille's Law
  1. Poiseuille's Law (Replies: 0)

  2. Snell's Law (Replies: 1)

  3. Lenz' law (Replies: 28)

Loading...