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

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15.5.4. Correlations Based on Analogies

In Section 15.2.1 we noted that Fick derived his model for mass transfer partly by analogy to Fourier’s law of heat transfer and that one reason Fick’s model was rapidly accepted was this close analogy to Fourier’s law. Shortly after Fick’s developments, Osborne Reynolds (yes, the Reynolds number is named after him) stated that heat or mass transfer in a moving fluid should be the result of both normal diffusion processes and eddies caused by the fluid motion. At the time, he had not yet discovered the difference between laminar motion (only normal diffusion operates) and turbulent motion (both molecular and eddy diffusion occur). We now know that Reynolds was correct only for turbulent flow. Since eddies ...

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