Damkohler-Peclet analysis

Key words palladium membranes, thin-wall Pd-Ag tubes, hydrogen permeation, Damkohler-Peclet analysis, alkaline electrolysers. 

Battersby S et al (2006) An analysis of the Peclet and Damkohler numbers for dehydrogenation reactions using molecular sieve silica (MSS) memlnane reactors. Catal Today 116 12-17... 

The ratio of reaction and permeation rates is critical in designing an MR. Dimensionless numbers are important in parametric analysis of engineering problems. They allow comparison of two systems that are vastly different by combining the parameters of interest. Dimensionless numbers are used to simplify the meaning of the information in scaUng-up the reactor for real flow conditions and to determine the relative significance of the terms in the equations. The Damkohler number (Da) is the ratio of characteristic fluid motion or residence time to the reaction time, and the Peclet number (Pe) defines the ratio of transport rate by convection to diffusion or dispersion (Basile et al, 2008a Battersby et al., 2006 Moon and Park, 2000 Tosti et al., 2009). In the case of an MR, Da and Pe are defined in Equations [11.1] and [11.2]. 

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