A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing


  • 3 years ago

Hi guys, quick question. I need to find the diffusivity of a species through a sphere (assume the species is concentrated at the center and diffuses outwards in 3D). Im assuming steady-state, so I'm using Fick's First Law, which for 3D scenarios is: J = -D [Del/Nabla Operator]C. First question is, would the equation then be: J = -D[(dC/dx)+(dC/dy)+(dC/dz)]? And if so, how would I go around solving this for J? In this equation, I am accounting for the diffusion in three directions (x,y,z) but the way I see it, they will all be the same (since its a sphere, r is the same for all). Am I correct?

  • This Question is Closed

    Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...


  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.