Conditions under which dispersion of a solute in a stream of solvent can be used to measure molecular diffusion
- 22 September 1954
- journal article
- Published by The Royal Society in Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
- Vol. 225 (1163) , 473-477
- https://doi.org/10.1098/rspa.1954.0216
Abstract
It is shown that an assumption made in the author’s previous discussion (Taylor 1953) can be presented as a result of analysis. The conditions under which an approximate solution of the equations for diffusion in a moving fluid can be used to interpret longitudinal dispersion of a solute in a stream of solvent flowing through a tube is given as 4L/a - > a Ua /D > 6.9. Here U is the mean velocity, a the radius of the tube, D the coefficient of molecular diffusion. L is the length of tube over which appreciable changes of concentration occur.Keywords
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