Numerical analysis of the dispersion of a contaminant through a simplified porous medium
It is presented the numerical analysis of the pollutant dispersion in porous media composed of infinite arrays of particles with different diameter ratios (DR). The DR ranged from 0.2 to 0.8, representing several degrees of expansion-contraction of the pore paths, not included in previous models. Th...
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| Main Authors: | , , , , , |
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| Format: | Online |
| Language: | spa |
| Published: |
Universidad Autónoma de Baja California
2021
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| Online Access: | https://recit.uabc.mx/index.php/revista/article/view/130 |
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| Summary: | It is presented the numerical analysis of the pollutant dispersion in porous media composed of infinite arrays of particles with different diameter ratios (DR). The DR ranged from 0.2 to 0.8, representing several degrees of expansion-contraction of the pore paths, not included in previous models. The corresponding porosities (f) covered the interval 0.27<f<0.72, and the pore Reynolds number was set to 50×103 which represented fully developed turbulent conditions. Results showed that for the case of DR=0.2 and f=0.27, the wake structures behind the smaller particles are elongated along with the gap spaces between particles, enhancing hence, the tracer dispersion. Oppositely, for the highest DR case, the porosity is lower and although the local velocities are high, the wake behind smaller particles are disrupted, and the homogeneity time increased drastically. Thus, eddy structures inside pore domains play a key role in the dispersion of a tracer. Taking into account that domains with large f contain less solid phase, this effect could be considered in the optimization of several engineering devices as cooling fins, arrays of tubes in heat exchangers, and static mixers to mention a few. |
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