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

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15.8 Advantages and Disadvantages of Different Diffusion and Mass-Transfer Models

In this section we briefly summarize the advantages and disadvantages of each of the mass-transfer models.

Molecular model. A molecular model has the advantage of explaining physically what is happening during diffusion, but the detailed theory is complex. The results [e.g., Eqs. (15-22)] are useful for predicting the diffusivity of gases. In its current state of development, this model needs to be used in conjunction with another model for complicated mass-transfer calculations. Use this model for physical understanding.

Fickian model. The Fickian model is a widely accepted model for diffusion, which means no one will laugh if you use it. It works well for ideal ...

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