Tutorial 10 summary for lecture 10 – 2021-7
1. Diffusion in a moving medium, concepts and key equations
In many practical problems, molecular diffusion in a medium is accompanied by a certain degree of the bulk movement of the medium. An example is that when you take a breath, air is mechanically drawn in your lung; at the same time O2 in the air diffuses into your deoxygenated blood stream. Breathing is a mechanical action, not diffusion, but the O2 enters your bloodstream through diffusion, which happens at the same time as your breathing.
In lecture 10 we consider the simplest situation, in which the directions of bulk movement of the medium and the diffusion of the solute occur in 1D.
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1.1 Conceptual pictures
Figure from Cengel, 5th ed.
1.2 On mass bases
1.3 On molar bases
Discussion page
2. Two idealized models
2.1 Molecular Diffusion through stagnant film (Stefan flow)
2.2 Equimolar counter diffusion
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