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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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18.6.1 Mass Transfer and Diffusion

Mass transfer across the film (see Figure 18-1) occurs by a combination of diffusion and convection. As is usual in film mass transfer, the driving force is assumed to be (c-cpore) where the concentration in the pores cpore is calculated at the surface of the particles. The film transfer term becomes −kf ap (c-cpore) where kf is the film mass transfer coefficient (m/s) and ap is the surface area of the particles per volume (m−1). For spherical particles

Image

(18-48a)

With porous particles the film equation is a bit more complicated than in Chapter 15 since the accumulation of mass in the particle is distributed between ...

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