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Moving regions

Experience has shown that a concave-downward (Fig. 17-10f) gas distributor is a better arrangement than a concave-upward (Fig. 17-10-e) gas distributor, as it tends to increase the flow of gases in the outer ortion of the bed. This counteracts the normal tendency of the gas to ow into the center of the bed after it exits the gas distributor. In addition, the concave-downward type of gas distributor tends to assist the eneral solids flow pattern in the bed, which is up in the center and own near the walls. The concave-upward gas distributor tends to have a slow-moving region at the bottom near the wall. If solids are large (or if they are slightly cohesive), they can build up in this region. [Pg.9]

Looking at the simulation results makes an appropriate choice apparent. The essential dynamic quality of the extractive column is the movement of the region of the temperature front, generated by the moving region of high mass transfer isopropanol/water. If the front is fixed sufficiently apart from both bottom and top of the column, the product specifications are insured. Therefore, the locus of the front is a suitable state variable. [Pg.475]

On the other hand, one may use a similar argument to prove an inverse statement. For any sequence Ea of eigenvalues of [Ha] and corresponding wavefunctions ErXl for a -> oo. One may divide the space into two half-spaces associated with the region 2u and the moved region 2. Any function Vo is localized mainly (with the norm being not less then 1 /2) in one of these half-spaces. It is then easy to find, for example, for a sub-sequence of functions < > , localized mainly near 2//, the cutoff functions fa such that... [Pg.53]

Fig. 1. Lateral migration. Inertial forces cause lateral migration of particles from slow moving regions near the capillary wall, resulting in particle velocities which are greater than the average solvent velocity. Fig. 1. Lateral migration. Inertial forces cause lateral migration of particles from slow moving regions near the capillary wall, resulting in particle velocities which are greater than the average solvent velocity.
We assume that we ean, in principle, impose or remove such constraints reversibly without heat, so there is no entropy change. If the nonequilibrium state includes macroscopic internal motion, the imposition of internal constraints involves negative reversible work to bring moving regions of the system to rest. If the system is nonuniform over its extent, the... [Pg.122]


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Separation regions, simulated moving

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