Description

The students will gain knowledge in mechanisms of mass transport by diffusion both in homogeneous and porous media. Analogies and correlations between heat- momentum- and mass transport will be discussed and illustrated.

• Fick’s law of binary diffusion. Fluxes relative to average velocities and relative to fixed frames.
• Diffusivities in low density gases and in liquids
• The case of polymers and colloidal suspensions
• Diffusion in the presence of a phase change
• Diffusion in porous media. Fick vs. Knudsen diffusion
• Coupling of heat and momentum transport. The Nusselt number
• Couplings between mass- and momentum or heat transport
• The Maxwell-Stefan equations for multicomponent diffusion.

Compétences visées

At the end of this course:

• You will learn about order of magnitude of diffusivities in gases and condensed phases and about their temperature and pressure dependence.
• You will be aware of the analogies between mass- momentum- and heat transport, as well as of the couplings between them.
• You will be able to use relevant dimensionless numbers to describe and predict these couplings.
• You will be aware of the limits of Fick’s law of mass diffusion in the case of multicomponent systems and learn about the way to describe them.

Contacts

Responsable(s) de l'enseignement

• Rene Muller