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

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15.5 Correlations for Mass-Transfer Coefficients

Intuitively, we would expect that as temperature increases, molecules will move faster (higher diffusivity), and k will increase. In addition, if fluid flow is involved, we would expect that a higher velocity or more mixing will increase the mass-transfer rate. Both of these intuitive statements turn out to be valid.

In Section 15.5.2 we will see that for simple physical situations such as steady-state mass transfer across a stagnant film, the mass-transfer coefficient can be determined analytically by solving the appropriate diffusion equations. Because the actual process often does not match the assumptions of the theory, the resulting theoretical correlation is often not as accurate as we desire. ...

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