Download Mass Transfer and Separation Processes : Principles and by Diran Basmadjian PDF

By Diran Basmadjian

A few easy Notions. charges of Mass delivery Gradient-Driven and compelled delivery shipping pushed through a possible distinction. The movie idea and the Mass move Coefficient The Two-Film thought Modeling Mass delivery: The Mass Balances The Compartment or Stirred Tank and the One-Dimensional Pipe The type of Mass Balances the knowledge bought from version recommendations Setting-up Partial Differential Read more...

summary: a few easy Notions. premiums of Mass delivery Gradient-Driven and compelled delivery shipping pushed via a possible distinction. The movie proposal and the Mass move Coefficient The Two-Film idea Modeling Mass shipping: The Mass Balances The Compartment or Stirred Tank and the One-Dimensional Pipe The type of Mass Balances the knowledge bought from version suggestions Setting-up Partial Differential Equations the final Conservation Equations Diffusion via Gases, beverages and Solids Diffusion Coefficients extra approximately Diffusion. temporary Diffusion and Diffusion wit

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Additional resources for Mass Transfer and Separation Processes : Principles and Applications, Second Edition

Sample text

To the knowledge of the author, this derivation has not been superceded by a more rigorous approach. α can be viewed as a “separation factor,” indicative of the degree of enrichment one can achieve in a single centrifuge. 1 is considered respectable. Centrifuge radius and rotational speed enormously affect the separation factor that varies exponentially and with the square of these quantities. Some Basic Notions: Rates of Mass Transfer 13 A. B. 5 The gas centrifuge: (a) foreground — sixth-generation composite centrifuge; background — prototype all-metal centrifuge (1978).

The only way for flow to cease, Q/A = 0, is for the pressure gradient dp/dx to vanish at this point. 3d. 4). Second, because they are confined to a specific location, they can serve as boundary conditions in the solution of the model equations. 3a has two such conditions, one at the center, where the flux vanishes, and a second at the surface, where the reactant concentration attains a constant value. 10) where the underlying model is found to be a second-order differential equation. Such equations require the evaluation of two integration constants and must, therefore, be provided with two boundary conditions.

This value would apply to oxygen transfer to flowing water assuming negligible resistance in the air. It comes as somewhat of a surprise that the much slower diffusive process in the lung yields a similar value, in fact exceeds it by a factor of 4. We Some Basic Notions: Rates of Mass Transfer 21 attribute this to the factors mentioned before (high A, low Δx) which make for efficient mass transfer in the lung. 2 Transport Driven by a Potential Difference (Constant Gradient): The Film Concept and the Mass Transfer Coefficient At the outset of this chapter, transport driven by a constant gradient, or “potential difference,” was identified as an important subcase of Fick’s law (variable gradient).

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