Compara mètodes

	Difusió de Stefan-Maxwell	Aproximació de Boussinesq	Lleis de Fick
Camp	Termodinàmica	Termodinàmica	Termodinàmica
Família	Process / pipeline	Process / pipeline	Process / pipeline
Any d'origen	1871	1903	1855
Autor original	Josef Stefan and James Clerk Maxwell	Joseph Boussinesq	Adolf Fick
Tipus	Diffusion equation	Approximation technique	Diffusion law
Font seminal	Reid, R. C., Prausnitz, J. M., & Poling, B. E. (1987). The Properties of Gases and Liquids (4th ed.). McGraw-Hill. ISBN: 978-0071247009	Boussinesq, J. (1903). Théorie Analytique de la Chaleur. Gauthier-Villars.	Fick, A. (1855). On liquid diffusion. Philosophical Magazine, 10(63), 30-39.
Àlies	Stefan-Maxwell equation, multicomponent diffusion	buoyancy approximation, Boussinesq model	diffusion equation, Fickian diffusion
Relacionats	3	3	3
Resum	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.	The Boussinesq Approximation simplifies the governing equations for natural convection by treating density as constant except in the buoyancy term. This approximation is valid when temperature variations produce small density changes and allows researchers to solve coupled heat-fluid flow problems without solving the full, nonlinear compressibility equations. The Boussinesq Approximation is fundamental to analyzing buoyancy-driven flows in buildings, enclosures, and geophysical applications.	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.