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Results tagged with diffusion
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user 6982
Diffusion is the net movement (spreading out) of molecules or atoms down a concentration gradient: from a region of high concentration to a region of low concentration.
1
vote
Soliton solution for a diffusive system
At least for an equilibrium situation, where $\dfrac{\partial n}{\partial t}=0$ and $\dfrac{\partial n}{\partial x}=0$, you would easily see that
$$d_1 n - d_2 n^2=0,$$
with the two solutions you a …
- 5,070
5
votes
What is the physical meaning of diffusion coefficient?
this would be the same as persons running from one side of a street
If all people are running in the same direction, then this would be convection, and not diffusion. … A larger diffusion coefficient does mean faster mixing. …
- 5,070
10
votes
Accepted
How does smoke move in the air and how can one direct it?
This is covered in the standard convection-diffusion type of equation:
$$ \frac{\partial C}{\partial t} + \vec{u} \cdot \nabla C= D \nabla^2 C$$
Where $C$ is the smoke concentration, and $D$ is the diffusion …
- 5,070