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MISCIBLE DISPLACEMENT IN POROUS MATERIALS
Author(s) -
BIGGAR J. W.,
NIELSEN D. R.
Publication year - 1961
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1961.tb00909.x
Subject(s) - tracer , porous medium , saturation (graph theory) , soil water , diffusion , porosity , dispersion (optics) , flux (metallurgy) , mixing (physics) , displacement (psychology) , materials science , soil science , geotechnical engineering , mechanics , geology , thermodynamics , optics , physics , psychology , mathematics , combinatorics , quantum mechanics , nuclear physics , metallurgy , psychotherapist
Summary Miscible displacement has been studied in several porous materials under saturated and unsaturated conditions at different average flow velocities. The tracer appeared at the end of the soil column sooner than would be expected, had no mixing occurred at the boundary of the tracer and tracer‐free water. Physical differences between porous materials were manifested by changes in shape and position of break‐through curves owing to ionic diffusion. One of the more important physical features was the magnitude of the volume of water not readily displaced at saturation and its increase when the soil was desaturated. Because the total flux of water moving through field soils is generally small, the role played by hydrodynamic dispersion and diffusion in transporting dissolved solutes must be included in the theory of most soil‐water processes.