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

Diffusion rate

  1. Apr 1, 2009 #1

    Q_Goest

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    I have a long, 24" diameter verticle pipe. There is a flow of gas through this pipe in which pure helium enters at the top and exits at the bottom where it exits to atmosphere. In this case, there must be a gradient of gasses with helium at the top and air at the bottom and a mixture between the two due to diffusion.

    My question is, what flow of helium is needed to keep this gradient constant? In other words, I want to maintain pure helium at some upper point in the pipe - so how can I determine the flow of helium needed to keep the air out?

    I know it has to do with Fick's law but I've never had to do a calculation like this one. Any thoughts?
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

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



Similar Discussions: Diffusion rate
  1. Diffusion of CO2 (Replies: 1)

  2. Diffusion interpetation (Replies: 10)

  3. Diffusion Length (Replies: 4)

  4. Diffusion on liquid (Replies: 1)

Loading...