BIBLIOS

Document type
Journal articles

Document subtype
Full paper

Title
Liquid mutual diffusivities of the H2O/D2O system

Participants in the publication
M. L. S. Matos Lopes (Author)
Dep. Química e Bioquímica
CQE
C. A. Nieto de Castro (Author)
Dep. Química e Bioquímica
CQE

Summary
The liquid-phase mutual diffusivities of the water (H2O) and deuterium oxide (D2O) system at 298.2 K were measured using an instrument based on the Taylor dispersion technique. The instrument has been designed to match, as closely as possible, the mathematical model of ideal Taylor dispersion, minimizing all the departures from the ideal model. The diffusivities were measured over the entire concentration range and the results follow a linear dependence on molar fraction given by 109 D 12 =2.24−0.36xD2O, where D 12 is in m2·s−1. Comparison with highly accurate data obtained by a Rayleigh interferometer seems to indicate that the accuracy of the present instrument is 1%. The hard-sphere model was applied to the estimation of the mutual diffusivities of this system and good agreement was found with experiment, deviations being ±3.5%.


Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
International Journal of Thermophysics

Publication Identifiers

Publisher
Springer Science and Business Media LLC



Document Identifiers
DOI - https://doi.org/10.1007/bf00502401
URL - http://dx.doi.org/10.1007/bf00502401

Keywords
deuterium oxide diffusivity mass transfer Taylor dispersion technique water

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