Knudsen criterion

Adaptive domain decomposition algorithm for liquid flow For gas flow, a few adaptive domain decomposition algorithms have been developed for multiscale coupling based on the Knudsen number. For Uquid flow, the molecular domain was always supposed to cover the interfacial or contact area, but a quantitative criterion is stiU absent. Besides, the algorithms for moving or discontinuous molecular domains are still underdeveloped. 

Assume that Pt was dispersed throughout the pore structure of the entire pellet in Problem 4.1 and apply the Weisz-Prater criterion to determine if mass transport limitations are expected. Do only one calculation using the lowest observed rate. Assume that the average pore diameter in the catalyst is 100 A (10 A = 1 nm), that Knudsen diffusion dominates, and that no external transport limitations occur (Cs = Co). 

The Knudsen number provides criterion for the validity of thermodynamic equilibrium and continuum model for gases. However, it does not hold for liquids. 

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