Single-Phase Flow in Fixed-Bed Reactors

Designs based on such a value of Re may well not adequately describe the true hydrodynamics of the system. Re is defined as pvA1 2/pij where p and p are the density and viscosity of the fluid phase, and v and A1 2 are a characteristic fluid velocity and length-scale, respectively, of the system under study. Reproduced with permission from Johns et al. (2000). Copyright (2000), A.I.Ch.E. 

The combination of techniques and research methodology described above is being applied to other fields. Examples include assessing the performance of filtration processes (e.g. Dirckx et al., 2000) and biofilm reactors (e.g. Beuling et al., 1998 Nott et al., 2001). Both these applications exploit the capability of measuring the flow field within the process unit in combination with imaging the internal structure of the system so as to understand the inter-relationship of the 

Measuring Chemical Composition and Mass Transfer in Fixed-Bed Reactors In Situ Studies of Reactions 

Further extensions of chemical mapping within a fixed bed lie in quantifying mass transfer between the intra-pellet and inter-pellet pore space. One approach to measuring mass transfer processes is to use displacement propagator measurements (see Section II.C). The data acquired for the esterification reaction described previously are shown in Fig. 31. In this propagator measurement, the total propagator measured for the system has been separated into two 

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