Modeling packed-bed reactors

Fig. 5.1.9 (a) MR measured propagators and es the velocity distribution narrows due to the (b) corresponding calculated RTDs for flow in a dispersion mechanisms of the porous media model packed bed reactor composed of 241- this effect is observed in the RTDs as a pm monodisperse beads in a 5-mm id circular narrowing of the time window during which column for observation times A ranging from spins will reside relative to the mean residence 20 to 300 ms. As the observation time increas- time as the conduit length is increased. 

Another possibility for modeling packed-bed reactors involves the use of a so-called unit cell approach where a suitable periodic structure in the packing is identified and subsequently used to define the boundaries of the computational domain. Due to the geometrical complexity the fluid flow (and other relevant equations have to be formulated and solved in curvilinear coordinates. In fact this approach has been followed for example, by Guj and De Matteis (1986) who used a MAC-like scheme (Welch et ai, 1965) to solve the Navier-Stokes equations. For random packings the unit cell approach becomes much more difficult due to the fact that a suitable periodic structure is difficult to define. 

Key words laminar flow, dispersive flow, bulk flow, porous media, permeability, convective dispersion, diffusion, dispersion, Taylor dispersion, convection, momentum balance, Darcy s law, Navier-Stokes model, packed bed reactor, CDE, STM, MIM. 

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See also in sourсe #XX -- [ ]

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