Modelling of multi-component gas flows in capillaries and porous solids

Young, J. B.; Todd, B. D.

doi:10.1016/j.ijheatmasstransfer.2005.07.034

Cited by 125 publications

(98 citation statements)

References 26 publications

(82 reference statements)

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“…This means that the Knudsen numbers, Kn = λ/2r, is within the transition regime (0.2 < Kn < 1.0) in which both continuum and discrete effects are important. Although it has been met with some criticism [18], the permeability (often referred to as the membrane coefficient) for MD membranes is often described using the dusty gas model [19]. In the dusty gas model, the total resistance to diffusion is the sum of the resistances to molecular and Knudsen diffusion.…”

Section: Models For Lep and Permeability Of An Ideal Membranementioning

confidence: 99%

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The effects of iCVD film thickness and conformality on the permeability and wetting of MD membranes

Servi

Guillén-Burrieza²,

Warsinger

et al. 2017

Journal of Membrane Science

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Membranes possessing high permeability to water vapor and high liquid entry pressure (LEP) are necessary for efficient membrane distillation (MD) desalination. A common technique to prepare specialized MD membranes consists of coating a hydrophilic or hydrophobic base membrane with a low surface-energy material. This increases its liquid entry pressure, making the membrane suitable for MD. However, in addition to increasing LEP, the surface-coating may also decrease permeability of the membrane by reducing its average pore size. In this study, we quantify the effects of initiated chemical vapor deposition (iCVD) polymer coatings on membrane permeability and LEP. We consider whether the iCVD films should have minimized thickness or maximized non-conformality, in order to maximize the permeability achieved for a given value of LEP. We determined theoretically that permeability of a single pore is maximized with a highly non-conformal iCVD coating. However, the overall permeability of a membrane consisting of many pores is maximized when iCVD film thickness is minimized. We applied the findings experimentally, preparing an iCVD-treated track-etched polycarbonate (PCTE) membrane and testing it in a permeate gap membrane distillation (PCMD) system. This study focuses on membranes with clearly defined, cylindrical pores. However, we believe that the principles we discuss will extend to membranes with more complex pore architectures. Overall, this work indicates that the focus of surface-coating development should be on minimizing film thickness, not on increasing their non-conformality. Keywords: Membrane distillation (MD), Desalination, Track-etched polycarbonate (PCTE) membranes, Dusty gas model, Initiated chemical vapor deposition (iCVD). SLStep coverage of the iCVD coating, can be written as = S(x)Step coverage of the iCVD coating within the membrane, written as =

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Section: Models For Lep and Permeability Of An Ideal Membranementioning

confidence: 99%

“…The physical basis for the mechanisms being in series is still under debate [18]. A condensed version of the dusty gas model for a membrane consisting of cylindrical pores of radius, r, length, L and concentration, c (pores/m 2 ) is given by…”

Section: Models For Lep and Permeability Of An Ideal Membranementioning

confidence: 99%

The effects of iCVD film thickness and conformality on the permeability and wetting of MD membranes

Servi

Guillén-Burrieza²,

Warsinger

et al. 2017

Journal of Membrane Science

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show abstract

“…Here,  was determined from the cumulative pore volume of the Al2O3 support, accounting for pores ranging from 17 to 300 nm in diameter, of 0.55 cm 3 g -1 . The group ( 2 ) is appropriate for use with the model of Young and Todd (2005) to model diffusion within the particle of catalyst. NWP was thus 0.09, much smaller than the value at which intra-particle mass transfer is important.…”

Section: Heat and Mass Transfer Considerationsmentioning

confidence: 99%

Kinetic studies of CO 2 methanation over a Ni/ γ -Al 2 O 3 catalyst using a batch reactor

Lim

McGregor

Sederman

et al. 2016

Chemical Engineering Science

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“…• Porous flows are modeled using the Cylindrical Pore Interpolation Model (CPIM) equations which provide a complete description of multi-component gas flows along porous capillaries [1].…”

Section: High Fidelitymentioning

confidence: 99%

“…where k is a constant with the same units as k 1 , b is a dimensionless constant and E a is the activation energy (Jmol -1 ).…”

Section: High Fidelitymentioning

confidence: 99%

LG Solid Oxide Fuel Cell (SOFC) Model Development

Haberman¹,

Martinez-Baca²,

Rush³

2013

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Modelling of multi-component gas flows in capillaries and porous solids

Cited by 125 publications

References 26 publications

The effects of iCVD film thickness and conformality on the permeability and wetting of MD membranes

The effects of iCVD film thickness and conformality on the permeability and wetting of MD membranes

Kinetic studies of CO 2 methanation over a Ni/ γ -Al 2 O 3 catalyst using a batch reactor

LG Solid Oxide Fuel Cell (SOFC) Model Development

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