Mass Transfer

The volumetric mass transfer coefficient (kLa) is the rate of gas transfer across the gas-liquid interface per unit of driving force (the driving force is the gas concentration gradient between the liquid and the gas). The mass transfer coefficient kLa can be seen as the product of two terms: the mass transfer coefficient kL and the specific interfacial area a. Both terms depend on a series of variables that can be grouped into three categories: (1) static properties of the liquid, such a density, diffusivity, and surface tension; (2) dynamic properties of the liquid (related to liquid flow), such as rheological parameters; and (3) liquid dynamics. In general, the variables in group 1 do not change very drastically. The variables in groups 2 and 3, however, may span wide ranges.

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