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Dispersion in developing velocity fields
Author(s) -
Gill William N.,
Ananthakrishnan V.,
Nunge Richard J.
Publication year - 1968
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.690140621
Subject(s) - laminar flow , dispersion (optics) , mechanics , perpendicular , flow (mathematics) , flow velocity , plane (geometry) , diffusion , convection , materials science , physics , optics , geometry , mathematics , thermodynamics
Convective diffusion in laminar flows which develop from rest and in the velocity entrance region of tubes, is studied. Criteria for the validity of the simple dispersion model are established by comparison of analytical results with numerical experiments. It is found that the extent of dispersion is less in developing velocity fields than in those which are fully developed. This occurs because dispersion is enhanced by differences in the velocity of the fluid particles on a plane perpendicular to the main direction of flow. Such differences are greatest when the flow is fully developed.