RE: ??convection coefficent?? a function of concentration

[Damm, Edward F. (E. Buddy)]

$u$ and $u_{c}$ are different.  $u$ is the convTerm.  It is confusing that my concentration is in u-fraction (u_c) since carbon is an interstitial. From: fipy@nist.gov [mailto:[EMAIL PROTECTED] On Behalf Of Daniel Wheeler Sent: Monday, May 29, 2006 11:58 AM To: Multiple recipients of list Subject: Re: ??convection coefficent?? a function of concentration On May 27, 2006, at 11:37 AM, Damm, Edward F. (E. Buddy) wrote: Jon, I think what you are saying is that I do not have a convection term here at all. My equation is $\frac{\partial u_{c}}{\partial t}=\nabla \left[ D\cdot \nabla u_{c}+u\cdot \nabla \phi \right] $ The last term is a convection term with a coefficient of        $\nabla \phi$ assuming the $u$ is supposed to be a $u_{c}$. OR, $\frac{\partial u_{c}}{\partial t}=\nabla \left[ D\cdot \nabla u_{c}+% \vec{u}\phi \right] $, right? The $u_{c}$ has turned into a vector, it is a scalar isn't it? Or are $u$ and $u_{c}$ different? Daniel Wheeler This message and any attachments are intended for the individual or entity named above. If you are not the intended recipient, please do not forward, copy, print, use or disclose this communication to others; also please notify the sender by replying to this message, and then delete it from your system. The Timken Company / The Timken Corporation