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Dispersion of aqueous polymer solutions injected from a point source into turbulent water flows
Author(s) -
El Riedy O. K.,
Latto B.
Publication year - 1981
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450590603
Subject(s) - turbulence , dispersion (optics) , mechanics , flow (mathematics) , polymer , reynolds number , aqueous solution , materials science , volumetric flow rate , tube (container) , water flow , chemistry , physics , environmental science , optics , soil science , composite material
The dispersion of water and aqueous polymer, when injected from a point source along the flow centre line into two‐dimensional, fully developed and uniform turbulent flows with flow Reynolds numbers of the order of 4.6 × 10 5 , have been studied experimentally. Concentration profiles at five locations were obtained for injection concentrations and velocities in the ranges 0 to 1000 w.p.p.m. and equal to or less than the local flow velocity. The concentrations were assessed using a fluorescing dye technique. Empirical equations describing the radial and longitudinal concentration field as a function of the injection and flow parameter are given. A universal concentration profile, independent of the injection flow rate and concentration and length of injection source tube, and valid for water and for polymer solution, under both fully developed and uniform flow, is also presented. The results indicate that the turbulent dispersion of polymer solution is suppressed compared to that of water.