Percolation

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percolation

[pər·kə′lā·shən]
(computer science)
The transfer of needed data back from secondary storage devices to main storage.
(hydrology)
Gravity flow of groundwater through the pore spaces in rock or soil.
(mining engineering)
Gentle movement of a solvent through an ore bed in order to extract a mineral.
(science and technology)
Slow movement of a liquid through a porous material.

Percolation

 

a method used to leach ores in a fixed bed, mainly, copper oxides and gold ores; leaching by this method is called percolation leaching. The process is carried out in a percolator tank. The pulverized ore is uniformly loaded onto the tank’s false bottom, which is a filtering device. The leaching solution is introduced either from beneath the false bottom, a process called upward leaching, or onto the surface of the load, a process called downward leaching; accordingly, the solution is collected either above or below the false bottom.

percolation

The downward movement of water into soil.
References in periodicals archive ?
Contrasting with the binary composites of CB/PP and CB/LDPE, the ternary composite system exhibits a lower percolation threshold and a strong PTC intensity, which is useful for the polymer processing engineering due to a low concentration of CB in the composites.
In the latter case, percolation threshold may depend on the type of mixing machine.
The alignment of the MWCNT is expected to lower the contact between MWCNT, resulting in an increase in the percolation threshold.
Mechanical spectroscopy is a powerful tool for determining the percolation threshold.
Table 2 compares the rheological and electrical percolation thresholds reported in the literature.
Electrical and rheological percolation thresholds for different carbon nanotube/polymer composites.
A rheological percolation threshold smaller than the electrical one implies that when the rheological percolation threshold is reached, the MWCNT are not in direct contact with each other yet or at least no "infinite" cluster is formed.
the theological percolation threshold would be reached when the CNT-CNT average distance is between the polymer entanglement distance and twice the radius of gyration, namely, from 10 to 100nm.
If the rheological percolation threshold is higher than the electrical one, the CNT-CNT distance is less than a few nm.