From Definitions to Function A Few Fundamental Ideas

In Table 4.1 L and G refer to liquid and gas phases AP, Ap, AC and A Vare the differences in pressures, partial pressures, concentrations and voltages, respectively porous and dense refer to the type of the material and sieving, solubility-diffusion and Donnan are types of mass-transfer mechanism. 

2 From Definitions to Function A Few Fundamental Ideas 259 Wall 

Process Phase 1 Phase 2 Force Material Mechanism 

Overall Performance A Balance Between Material and Fluid Limitations 

As in all unit operations in which a wall separates two fluids, detrimental effects of polarization and fouling may be expected on both sides of the wall following the build up of boundary layers and fluid-to-wall interactions. All these phenomena are classical with, for example, heat exchange surfaces. 

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