Recent content by JHZR2

  1. J

    Solution to diffusion equation in 1d spherical polar coordinates

    Hi, Can you explain why one would say that: so r^2.∂c/∂r must be independent of r (-B, say)? Why would you equate r^2.∂c/∂r to be -B? What is the basis for this and/or the technique that does this called? I've gotten a little forgetful on some of these techniques... The OP also had the...
  2. J

    Graduate Forgotten my maths Simple 1D ODE, spherical coordinates

    Hi, I seem to have forgotten some of my math how-to, as I haven't done this in a while. Looking through my notes, Bird, Stewart and Lightfoot, Greenberg, etc. don't really help. My equation is this, at steady state: 0 = 1/r^2 ∂/∂r (D*r^2 ∂C/∂r) + P Where P is some production rate...