Eddy diffusivity for distillation sieve trays

An understanding of the eddy diffusivity on a distillation tray is important to accurately predict the distillation tray efficiency from the point efficiency. This article presents a new correlation to predict liquid‐phase eddy diffusivity (De) on sieve trays. This correlation has been developed by...

Full description

Saved in:
Bibliographic Details
Published in:AIChE journal 1991-04, Vol.37 (4), p.589-596
Main Authors: Bennett, Douglas L., Grimm, Henry J.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Distillation
Exact sciences and technology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An understanding of the eddy diffusivity on a distillation tray is important to accurately predict the distillation tray efficiency from the point efficiency. This article presents a new correlation to predict liquid‐phase eddy diffusivity (De) on sieve trays. This correlation has been developed by modeling backmixing as the trajectory motion of liquid droplet elements through the two‐phase layer height on the tray. The trajectory model indicates that De is a strong function of the two‐phase layer height. An expression for froth height is derived. The new De correlation offers two main improvements over existing literature correlations. First, this model is phenomenologically‐based and, therefore, not limited to air/water. Second, the new De correlation gives significantly lower average actual and relative errors and a lower standard deviation of the actual error than do other available correlations.
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.690370412