Measurement and Network Modeling of Liquid Permeation into Compacted Mineral Blocks

Schoelkopf, Joachim; Ridgway, Cathy J.; Gane, Patrick; Matthews, G. Peter; Spielmann, D.

doi:10.1006/jcis.2000.6885

Cited by 87 publications

(76 citation statements)

References 35 publications

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“…y c was determined for every batch and the values in Table 2 reveal that the changeover is at larger penetration lengths for higher porosity batches. This is in line with the observations in Schoelkopf et al (2000), where the changeover was at a larger penetration length for tubes with larger radii. The initial penetration rate in the inertial flow regime scales linearly with the porosity (Fig.…”

Section: Liquid Imbibitionsupporting

confidence: 92%

“…In contrast to y ∝ √ t as described by the LW equation (henceforth referred to as the Laplace-Poiseuillian flow regime), it is known that the liquid uptake length in compacted calcium carbonate is directly proportional to t for short timescales of the imbibition (henceforth referred to as the inertial flow regime). Schoelkopf et al (2000) used the Bosanquet equation to consider both inertial and viscous forces acting on the liquid. The authors demonstrated that the liquid uptake length of compacted calcium carbonate blocks changes from a linear t-dependence to a √ t-dependence.…”

Section: Liquid Imbibitionmentioning

confidence: 99%

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Resolving the rapid water absorption of porous functionalised calcium carbonate powder compacts by terahertz pulsed imaging

Markl

Wang

Ridgway

et al. 2018

Chemical Engineering Research and Design

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Cost effectiveness, ease of use and patient compliance make pharmaceutical tablets the most popular and widespread form to administer a drug to a patient. Tablets typically consist of an active pharmaceutical ingredient and a selection from various excipients. A novel highly porous excipient, functionalised calcium carbonate (FCC), was designed to facilitate rapid liquid uptake leading to disintegration times of FCC based tablets in the matter of seconds. Five sets of FCC tablets with a target porosity of 45-65% in 5% steps were prepared and characterised using terahertz pulsed imaging (TPI). The high acquisition rate (15 Hz) of TPI enabled the analysis of the rapid liquid imbibition of water into these powder compacts. The penetration depth determined from the TPI measurements as a function of time was analysed by the power law and modelled for both the inertial (initial phase) and Lucas-Washburn (LW, longer time Laplace-Poiseuillian) regimes. The analysis of the hydraulic radius estimated by fitting the liquid imbibition data to the LW equation demonstrates the impact of the porosity as well as the tortuosity of the pore channels on the liquid uptake performance. The tortuosity was related to the porosity by a geometrical model, which shows that the powder compact is constructed by aggregated particles with low permeability and its principal axis perpendicular to the compaction direction. The consideration of the tortuosity yielded a very high correlation (R 2 = 0.96) between the porosity and the hydraulic pore radius. The terahertz data also resolved fluctuations (0.9-1.3 Hz) of the liquid movement which become more pronounced and higher in frequency with increasing porosity, which is attributed to the constrictivity of pore channels. This study highlights the strong impact of a tablet's microstructure on its liquid penetration kinetics and thus on its disintegration behaviour.

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Section: Liquid Imbibitionsupporting

confidence: 92%

Section: Liquid Imbibitionmentioning

confidence: 99%

Resolving the rapid water absorption of porous functionalised calcium carbonate powder compacts by terahertz pulsed imaging

Markl

Wang

Ridgway

et al. 2018

Chemical Engineering Research and Design

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“…1. After streaming, f 0 , f 1 , f 3 , f 4 , f 7 , and f 8 are known, while f 2 , f 5 , and f 6 are unknown. The unknown components are solved for using Eqs.…”

Section: A the Lattice Boltzmann Algorithmmentioning

confidence: 99%

“…Because of the obvious discrepancy in geometry of capillary bundles from real porous networks, a further extension was made by Ridgeway and other researchers [6][7][8] to construct a more general capillary network model. This model represents (random) porous networks as a lattice, consisting of pores and capillaries with varying sizes [6][7][8]. Because of its easiness of incorporating size distributions, it has been commercialized and used for interpreting mercury porosimetry data.…”

Section: Introductionmentioning

confidence: 99%

Microfluidics of imbibition in random porous media

Wiklund

Uesaka

2013

Phys. Rev. E

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A free-energy lattice Boltzmann approach has been used to perform simulations of liquid penetration into random porous media. We focus our study on the effects of microstructures, particularly microtopography, on liquid penetration driven by capillary force and external pressure. For this purpose we set up a model structure that consists of a network of interconnected capillaries with varying pore geometries. The results showed that the discontinuities in the solid-surface curvature, as are present as corners on the capillary surfaces, have strong influences on liquid penetration through their pinning effects and interactions with local geometry.

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“…Empirical and semiempirical models, e.g., "Pore-Cor" model, void structure parameters being found from Hg-intrusion and similar measurements (21,22), whereas the treatment of experimental results for description of porous structures is mostly empirical.…”

Section: Other Models Of Percolationmentioning

confidence: 99%

Random Trajectory Modeling of Limited-Volume Percolation in a Microporous Structure

Romm

2001

Journal of Colloid and Interface Science

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Measurement and Network Modeling of Liquid Permeation into Compacted Mineral Blocks

Cited by 87 publications

References 35 publications

Resolving the rapid water absorption of porous functionalised calcium carbonate powder compacts by terahertz pulsed imaging

Resolving the rapid water absorption of porous functionalised calcium carbonate powder compacts by terahertz pulsed imaging

Microfluidics of imbibition in random porous media

Random Trajectory Modeling of Limited-Volume Percolation in a Microporous Structure

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