Authors: Josefina BarreraCortés Efraín ManillaPérez Héctor M PoggiVaraldo
Publish Date: 2006/11/03
Volume: 29, Issue: 5-6, Pages: 391-398
Abstract
The objective of this work was to determine 1 the effect of rotational speed N and lifters on the oxygen transfer coefficient k L of a mineral solution and 2 the effect of solids concentration of a slurry soilmineral solution on k L at a fixed value N 025 s−1 in both cases the treatment was carried out in an aerated rotating drum reactor RDR operated at atmospheric pressure First the k L for the mineral solution was in the range 638 × 10−4–769 × 10−4 m s−1 which was of the same order of magnitude as those calculated for closed rotating drums supplied with air flow In general k L of RDR implemented with lifters was superior or equal to that of RDR without lifters For RDR implemented with lifters k L increased with N in the range 665 × 10−4–1051 × 10−4 m s−1 whereas k L of RDR without lifters first increased with N up to N = 0102 s−1 and decreased beyond this point Second regarding soil slurry experiments an abrupt fall of k L ca 50 at low values of the solid concentration C v and an asymptotic pattern at high C v were observed at N = 025 s−1 These results suggest that mass transfer phenomena were commanded by the slurry properties and a semiempirical equation of the form Sh = fRe Sc seems to corroborate this finding
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