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Axial diffusion of liquids in packed beds and end effects
Author(s) -
Liles A. W.,
Geankoplis C. J.
Publication year - 1960
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690060417
Subject(s) - void (composites) , packed bed , diffusion , mechanics , spheres , inlet , chemistry , hydraulic diameter , materials science , thermodynamics , physics , chromatography , composite material , reynolds number , turbulence , engineering , mechanical engineering , astronomy
Experimental data were obtained on the effect of bed length of packed spheres on axial diffusion coefficients with the frequency response technique used. Lengths of packed section of 6 to 174 cm. were used. The end effects were eliminated by using a novel experimental technique for analyses of the inlet and outlet streams. No effects of length on D L were found. When the end effects were artificially introduced by using void analytical sections at the two ends, then large effects of length on D L were found. These void sections were the cause of length effects found by other experimenters. The D L drops as the length of bed is increased. Above about 65 cm. length the D L remains constant with increase in length. The over‐all results are in general agreement with the data of others.