Sum-of-resistances model

This form should look familiar it is the sum-of-resistances model from Chapter 3. If m is small, Ky ky and the gas-phase resistance is the dominant. If m is large, Kx kx and the liquid-phase resistance controls. Remember what a small or large value of m implies for the solubility of a solute in the liquid phase relative to the gas-phase concentration. 

If there is a resistance at the interface, then this resistance must be added to Eqs. tl5-31). This sum-of-resistances model shows that the overall coefficients will not be constant even if and ky are constant if the equilibrium is curved and m varies. In binary distillation m is the tangent to the equilibrium curve at avg ( A,i and since the equilibrium curve is never straight, m has to vary. For exanple, if we... 

The overall mass-transfer coefficient is related to the individual coefficients for the continuous and dispersed phases with a sum of resistances model similar to that developed in Eq. M 6-31cT... 

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See also in sourсe #XX -- [ ]

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