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

Shrinking core model

  1. May 3, 2012 #1
    I have this solution that I don't quite understand


    from here I would have thought to separate the variables and integrate but the solution says

    ro/2* d(D)/d(t) = -kr Cao

    I guess my question is how are you able to do that? If you take the derivative of D, why is d(D)/d(t) still left behind?
  2. jcsd
  3. May 3, 2012 #2


    User Avatar
    Science Advisor
    Homework Helper

    hi cycling4life! :smile:

    (try using the X2 button just above the Reply box :wink:)
    chain rule … d(D3)/dt = 3D2 dD/dt :wink:
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Shrinking core model
  1. Modeling problem (Replies: 3)

  2. Sufficient model, or ? (Replies: 1)

  3. Kinetics Modeling (Replies: 1)