These properties make mass transport systems described by fick s second law easy to simulate numerically. Learn how to apply the second law in several practical cases, including homogenization, interdiffusion in carburization of steel, where diffusion plays dominant role. Fick s experiments dealt with the measurement of the concentration and flux of salt diffusing between two reservoirs. Fick s second law of diffusion is a linear equation with the dependent variable being the concentration of the chemical species under consideration. Fick s law for binary diffusion in liquids is based on experiments performed by adolf e. Steadystate diffusion when the concentration field is independent of time and d is independent of c, fick.
Fick s law for binary diffusion in liquids is based on experiments performed by adolf fick in 1855. Specifically, atomic diffusion is a diffusion process whereby the random thermallyactivated movement of atoms in a solid results in the net transport of atoms. D the concentration gradient is often called the driving force in diffusion but it is not a force in the mechanistic sense. Diffusion can be modeled by fick s laws of diffusion 26. Fick s first law where d is the diffusion coefficient dx dc j. Fick s second law todays topics learn how to deduce the fick s second law, and understand the basic meaning, in comparison to the first law. For an unbounded environment with a point source having an impulsive molecule release and transparent receivers at distance d ij, the.
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