The statistical character of bed-scale effective heat transport coefficients for packed beds
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...On the other hand, there are a number of studies on gas flow discussing experimental, statistical and theoretical aspects, and the results are quite conclusive (e.g. see Tsotsas and Schlünder, 1990; Borkink et al., 1992; Freiwald and Paterson, 1992; Thoméo and Freire, 2000)....
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...For gas flow studies, a large variation in To was observed with both radial position and gas flow rate (Dixon, 1985; Borkink et al., 1992; Thoméo and Freire, 2000), and this variation was attributed to the entrance effects rather than to the effective thermal parameters with the increasing axial distance....
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...For gas flow studies, a large variation in To was observed with both radial position and gas flow rate (Dixon, 1985; Borkink et al., 1992; Thoméo and Freire, 2000), and this variation was attributed to the entrance effects rather than to the effective thermal parameters with the increasing axial…...
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Cites background from "The statistical character of bed-sc..."
...Therefore, some authors have suggested that the statistical character of a packed bed should be incorporated in the reactor model (see Fedoseev and Shanin, 1986; Wijngaarden and Westerterp, 1992a,b; Borkink et al., 1992)....
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...Another approach to average angular variations is repacking the bed (see Borman and Westerterp, 1992; Borkink et al., 1992; and Wijngaarden and Westerterp, 1992b)....
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...…also argued that over longer bed lengths the gas has undergone an axial averaging by contacts with so many particles, consequently differences caused by variation of streamlines through the packing should average out, unless there is a bypass in some part of the bed (see also Borkink et al., 1992)....
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