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Chloride‐36 Diffusion during Stable and Unstable Flow through Glass Beads
Author(s) -
Biggar J. W.,
Nielsen D. R.
Publication year - 1964
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1964.03615995002800050008x
Subject(s) - diffusion , bead , viscosity , flow (mathematics) , mixing (physics) , materials science , porosity , porous glass , thermodynamics , porous medium , chemistry , mechanics , composite material , physics , quantum mechanics
The effect of the properties of solution on the mixing occurring in porous material has been examined in glass beads using Cl 36 . Matched NaCl solutions of 0.01, 0.1, and 4 N concentration with either the displacing or displaced solutions identified by Cl 36 were displaced from a 30‐cm. column. Displacements were made in the horizontal and vertical direction at two flow velocities. For solution density and viscosity differences of 0.0034 g. per ml. and 0.003 centipoise, respectively, between the displacing and displaced solution, unstable flow was clearly demonstrated. In the simple glass bead porous system, unstable flow may be of greater significance than the concentration dependent nature of the diffusion coefficient.