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Behavior of macromolecules in dilute solutions: II—On the axial dispersion coefficient
Author(s) -
Chen H. R.,
Blanchard L. P.
Publication year - 1975
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.5450530503
Subject(s) - reynolds number , dispersity , polystyrene , dispersion (optics) , thermodynamics , viscosity , toluene , dimensionless quantity , materials science , intrinsic viscosity , analytical chemistry (journal) , chemistry , polymer chemistry , chromatography , physics , polymer , optics , organic chemistry , turbulence , composite material
Using pulse‐input technique, axial dispersion coefficients were determined for polystyrene in tetrahydrofuran, in toluene and in a toluene/methanol mixture flowing in a long capillary tube under conditions such that the Reynolds number was less than 500. Low polydispersity polystyrene materials with nominal molecular weights ranging from 900 to 1.8 × 10 6 were used. For the system studied and for fixed Reynolds numbers, the coefficient, on log‐log scales, was found to be a linear function of the product of the intrinsic viscosity and the molecular weight. An empirical equation relating this coefficient to the Reynolds number and to [η]M was obtained. This equation predicted results which agreed well with experimentally determined values.