The effect of surface chemical reactions on interphase mass and energy transfer
โ Scribed by G. Standart
- Publisher
- Elsevier Science
- Year
- 1967
- Tongue
- English
- Weight
- 706 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0009-2509
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โฆ Synopsis
The relations developed earlier from the irreversible thermodynamics of transport processes on the phase boundary of heterogeneous flow systems are applied to the analysis of the influence of surface chemical reactions on interphase heat (energy) and especially mass transfer. Such interactions arise in the case of the transport of "limited-transfer" constituents which participate in the reaction(s) but whose solubility, or in general, concentration in one or the other phase is negligible so that its mass flux is also negligible on that side of the boundary. Several basic cases are analysed in detail in terms of two alternate formulations of a reference chemical equilibrium state and it is found that the surface reaction adds a chemical reaction resistance to the direct physical transfer resistance when the limited-transfer constituent actually crosses the phase botmdary. The mass transfer driving forces are expressed in terms of suitable constituent electrochemical potentials or activities and although the treatment is largely limited to one system of driving forces and fluxes, it is shown how the various types of interphase mass and energy transfer driving forces and fluxes introduced earlier can be employed.
๐ SIMILAR VOLUMES
Simple limiting expressions are derived for predicting the rate of absorption of solute A into a phase already containing a dissolved species B, which reacts instantaneously and irreversibly with A. These limiting expressions, equations (L), (H) and (A), which are not sensitive to system geometry, p