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| Fickin lait× | Stefan-Maxwell-diffuusio× | |
|---|---|---|
| Tieteenala | Termodynamiikka | Termodynamiikka |
| Menetelmäperhe | Process / pipeline | Process / pipeline |
| Syntyvuosi≠ | 1855 | 1871 |
| Kehittäjä≠ | Adolf Fick | Josef Stefan and James Clerk Maxwell |
| Tyyppi≠ | Diffusion law | Diffusion equation |
| Alkuperäislähde≠ | Fick, A. (1855). On liquid diffusion. Philosophical Magazine, 10(63), 30-39. DOI ↗ | Reid, R. C., Prausnitz, J. M., & Poling, B. E. (1987). The Properties of Gases and Liquids (4th ed.). McGraw-Hill. ISBN: 978-0071247009 |
| Rinnakkaisnimet | diffusion equation, Fickian diffusion | Stefan-Maxwell equation, multicomponent diffusion |
| Liittyvät | 3 | 3 |
| Tiivistelmä≠ | Fick's Laws describe how species diffuse through media due to concentration gradients. The First Law (steady-state) relates diffusion flux to concentration gradient, while the Second Law (transient) describes how concentration changes over time. These laws are fundamental to mass transfer analysis, applying to gases, liquids, and solids. Fick's Laws are analogous to Fourier's Law of heat conduction, replacing temperature with concentration. | The Stefan-Maxwell diffusion equation describes how multiple chemical species diffuse through each other in a mixture, accounting for interactions between all species pairs. Unlike Fick's law, which assumes species diffuse independently, Stefan-Maxwell theory captures the coupling that occurs when species with different diffusivities move at different rates. This is essential for analyzing gas separation, combustion, catalytic processes, and reactive distillation. |
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