It is shown how upper and lower bounds to the effectiveness factor may be obtained by variational methods. The formulae are developed to be capable of handling mass transferresistance at the surface of the catalyst particle, a diffusion coefficient which depends upon position in the particle, and a
Communications on the theory of diffusion and reaction — X. A generalization of Wei's bounds on the maximum temperature
✍ Scribed by C. Georgakis; R. Aris
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 217 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0009-2509
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📜 SIMILAR VOLUMES
The equations for isothermal diffision and pth order reaction in a porous slab are integrated and the results presented in a series of araphs. The asymptotic relations and use of the graphs are discussed.
NOTATION ra & a component transferring into phase of interest f A concentration of a, moles/l A, interfacial concentration of component a, moles/l ; b component already present in phase of interest B concentration of b, moles/l B, initial concentration of component b, moles/l 5 REFERENCES diffusivit
If there 1s both internal and external resistance to the transfer of heat and matter to a catalytic pticle some mterestmg combmatlons of effects may arise Since multiple steady states can be obtained when only one of the resistances IS considered, there IS a range of parameters for which five steady
When a spherical catalyst particle in which a non-isothermal reaction is taking place is subject to a very steep gradient of external conditions, its effectiveness factor is a function of these gradients as well as of the Thiele modulus evaluated for equatorial conditions. It is shown how the effect