Fugacity and concentration gradients in a gravity field

Details Fugacity and concentration gradients in a gravity field Fugacity and concentration gradients in a gravity field

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8630620m&link_type=abstract

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Computer Science

Concentration (Composition), Equilibrium, Gradients, Gravitation, Molecular Weight, Hydrostatic Pressure, Kinetics, Osmosis, Solubility, Transient Response

Scientific paper

Equations are reviewed which show that at equilibrium fugacity and concentration gradients can exist in gravitational fields. At equilibrium, the logarithm of the ratio of the fugacities of a species at two different locations in a gravitational field is proportional to the difference in the heights of the two locations and the molecular weight of the species. An analogous relation holds for the concentration ratios in a multicomponent system. The ratio is calculated for a variety of examples. The kinetics for the general process are derived, and the time required to approach equilibrium is calculated for several systems. The following special topics are discussed: ionic solutions, polymers, multiphase systems, hydrostatic pressure, osmotic pressure, and solubility gradients in a gravity field.

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