Preferred Label : differential diffusion coefficient;
IUPAC definition : Defined by \[D_{i} \frac{-J_{i}}{\nabla c_{i}}\] where Ji is the amount of species
i flowing through unit area in unit time and ci is the concentration gradient of
species i. Different diffusion coefficients may be defined depending on the choice
of the frame of reference used for Ji and ci. For systems with more than two components,
the flow of any component and hence its diffusion coefficient depends on the concentration
distribution of all components. The limiting differential diffusion coefficient is
the value of Di extrapolated to zero concentration of the diffusing species: \[[D_{i}]
\lim _{c_{i}\rightarrow 0}D_{i}\];
Origin ID : D01704;
See also
Defined by \[D_{i} \frac{-J_{i}}{\nabla c_{i}}\] where Ji is the amount of species
i flowing through unit area in unit time and ci is the concentration gradient of
species i. Different diffusion coefficients may be defined depending on the choice
of the frame of reference used for Ji and ci. For systems with more than two components,
the flow of any component and hence its diffusion coefficient depends on the concentration
distribution of all components. The limiting differential diffusion coefficient is
the value of Di extrapolated to zero concentration of the diffusing species: \[[D_{i}]
\lim _{c_{i}\rightarrow 0}D_{i}\]
