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Axial dispersion in coiled tubular reactors

โœ Scribed by Denys F Leclerc; Peter A Bloxham; E.Clifford Toren Jr.

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
896 KB
Volume
184
Category
Article
ISSN
0003-2670

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โœฆ Synopsis

A theoretical and experimental treatment of axial dispersion in coiled tubes is presented. The dispersion, 6, is related to the theoretical plate height divided by four times the radius of the tube (H/4r). This parameter, when plotted against the product of the Reynolds number and the Schmidt number (ReSc), accurately predicts maxima in dispersion curves. Variations in the boundary layer thickness and the velocity profile cause the dispersion to pass through a maximum at a constant value of log (De2Sc*'14) equal to 6.13 for unretained solutes (De is the Dean number). A new measure of dispersion is proposed; the reduced dispersion, E = 256/(Re o.66'Sc), is derived from the experimental behavior of dispersion at values of log (DezSc1'14) smaller than 6.13. The logarithm of E is found to be approximately zero for 2.2 < log (De*Sc 1*14) < 6.1 and to decrease linearly with log (DezSc*'14) at higher values. Experiments with four solutes that have a wide range of molecular diffusivities are reported. Results agree with theory.

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