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Axial mixing in a rotating disk contactor—I Apparent longitudinal diffusion

✍ Scribed by K.R. Westerterp; P. Landsman

Publisher: Elsevier Science
Year: 1962
Tongue: English
Weight: 710 KB
Volume: 17
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(62)80037-2

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✦ Synopsis

For homogeneous liquid phase operation the residence time distribution in two small rotating disk columns has been investigated and interpreted by means of a diffusion model. P&let numbers, CL/9, ranging from 0.6 to 31 were found. It is shown that the apparent axial diffusivity may be considered as the sum of a flow contribution and a rotational contribution. This gave rise to the following correlation : Pe = 2N 1 + 13 x 10-3(nR/5) ' where N is the number of compartments in the R.D.C. and nR/B a measure of the ratio. of the linear stirring velocity and the liquid flow velocity through the column. The equation is shown to hold for columns with six and twenty-four compartments and with length to diameter ratios from 3 to 15. Special procedures were used for interpolation between theoretical curves, calculated for selected W values.

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