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

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15.4.1 Film Theory for Dilute and Equimolar Transfer Systems

Figure 15-1 showed diffusion across a thin layer or film. Later in this chapter Figure 15-5 will show mass transfer to an interface through thin films of gas and liquid. After that, Figure 15-6 will show mass transfer in absorption when the liquid mass-transfer rate is very rapid, and Figure 15-7 will show mass transfer to a falling liquid film. The reason for this interest in mass transfer through films is that the most commonly used model for mass transfer in separators is a film model. The film model assumes that mass transfer to a surface or interface from the bulk fluid occurs across a stagnant film of unknown thickness δ. The mass-transfer rate in this film occurs by molecular ...

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