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!

Homework Help: Velocity of flow (V) Vs. Flow (Q)

  1. Nov 4, 2011 #1
    1. The problem statement, all variables and given/known data
    Something I cannot seem to understand is this:

    When looking at the velocity of flow (V), if I were to increase radius (r) that would mean I increase the cross sectional area (A) which means I decrease V.
    Yet at the same time if I were to increase radius (r) I would decrease resistance (R) and my flow would increase (Q).

    I do not understand how this is possible. That if I increase flow (Q) that my velocity decreases when the radius is increased? Are the 2 equation independent of one another?

    2. Relevant equations

    V = Q/A where A = ∏r^2

    Q = ΔP/R where R = (8ηl)/∏r^4
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted