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Permeability & Tortuosity Measurement by Mercury Porosimetry.
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Sample
permeability and tortuosity testing is offered as an extension to our
standard Mercury Intrusion Porosimetry analysis which includes calculation of bulk
density and sample porosity. Permeability
is determined using a Micromeritics AutoPore instrument
through the application of a large number of data points covering regions of
significant intrusion. The analysis report includes details of
sample density and porosity and therefore gives a direct measurement of
both porosity and permeability from the same analysis. This has proven to
be particularly applicable and beneficial to the hydrology, petrology,
geotechnical testing and catalysis where the technique provides huge time
saving Permeability (in mD) is calculated using the threshold pressure of mercury intrusion, the sample envelope and true density values. Envelope density is determined from the mercury intrusion data and true density can be entered either as a known or assumed value for the material or measured using our helium pycnometry option. This may be undertaken on a representative sample from a batch or may be determined prior to the permeability / porosity analysis itself. Such an option is useful where issues of sample homogeneity exist. Our density analysis page provides more details on these techniques additional options for determining porosity within given ranges.
Mercury Porosimetry Intrusion Curve for permeability and porosity testing Sample
tortuosity provides a measure of the difference between the actual path
length through sample pores and the geometrically shortest distance
through the sample. The generation of tortuosity data requires the
generation of permeability data and a known value of the BET surface area
of the sample. The surface area may be provided from a known value or can
be measured using our BET surface area
analysis option. The information provided by the permeability porosity and tortuosity analysis options as well as our standard mercury porosimetry tests is detailed below.
1. Total Pore Volume may be calculated if bulk density and true density of the sample are known and is reported separately from the generated mercury porosimetry reports. 2. The Threshold Pore Size (diameter) is calculated from the mercury intrusion curve and is reported separately from the generated permeability reports. |
