Anomalous transport in activated carbon porous samples: power-law trapping-time distributions

G Drazer, M Rosen and D.h Zanette

Physica A: Statistical Mechanics and its Applications, 2000, vol. 283, issue 1, 181-186

Abstract: We present experimental solute desorption measurements in porous packings of activated carbon grains. In desorption experiments a tagged NaI solution initially saturating the medium is replaced by water. The solute concentration, obtained at different cross sections of the porous sample, follows a power-law decay for long times. We experimentally observe a constant power-law exponent as we modify the injection rate and the distance from the inlet section. We reobtain this behavior within a continuous-time random-walk approach, establishing a relation between the waiting time distribution and the adsorption isotherm determined experimentally. The obtained waiting time distribution with a divergent first moment is characteristic of anomalous mixing zone broadening.

Keywords: Anomalous transport; Porous media; Adsorption (search for similar items in EconPapers)
Date: 2000
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:283:y:2000:i:1:p:181-186

DOI: 10.1016/S0378-4371(00)00149-7

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