Theoretical analysis of concentration polarization in membrane modules for gas separation with feed inside the hollow-fibers

Mourgues, A.; Sánchez, J.

doi:10.1016/j.memsci.2004.11.024

Cited by 83 publications

(44 citation statements)

References 21 publications

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“…These effects correspond to the polarization phenomena by concentration (represented in Figure 5) which can have a big impact on the diffusive term of gas permeation. 12 The diffusive permeation coefficient (k A ) can then be written as the inverse of the sum of the inverse of the different mass transfer coefficients (equivalent to the conductance in an electronic in-series resistances system).…”

Section: Theoretical Considerations Mass Transfer Modelmentioning

confidence: 99%

Modeling of coupled mass and heat transfer through venting membranes for automotive applications

et al. 2008

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in Wiley InterScience (www.interscience.wiley.com).Experimental and theoretical approaches based on a mathematical model, have been developed to study the evolution of environmental parameters (temperature, total pressure, relative humidity, and water vapor partial pressure) inside a housing of an electronic device with a window containing a macroporous membrane. The model was based on the coupling of mass and heat transfer taking into account the effects of polarization of concentration in boundary layers. Membranes have been characterized by mercury porosimetry, liquid entry pressure measurements, scanning electron microscopy, and gas permeation. Once the model was experimentally validated, it was applied to investigate the influence of membranes on heat and mass transfer and to study the impact of the boundary layers on the global mass transport. The results demonstrated the importance of the membrane choice and dimensions to get the best temperature regulation and avoid water condensation inside an automotive electronic control unit (ECU).

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Section: Theoretical Considerations Mass Transfer Modelmentioning

confidence: 99%

Modeling of coupled mass and heat transfer through venting membranes for automotive applications

et al. 2008

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“…To describe the permeation characteristics in such condition, Gaohong et al (19) asserted that a better correlation to describe the gas separation needs to be investigated, which can explain the effect of permeation itself clearly, while Mourgues et al (20) concluded that the general relation for multiple parameters such as permeate flux, operating pressure and feed velocity is difficult to obtain because these parameters depend on each other. Several studies (14)- (15), (18) have been conducted to introduce new methods for estimating hydrogen permeation flux for the case of high H 2 permeation ratio.…”

Section: Introductionmentioning

confidence: 99%

“…In another study (18) , a novel permeation reduction coefficient was introduced to consider the inhibition by CO and concentration polarization simultaneously. Even though many researchers (12), (14), (19)- (20) pointed out that the permeation flux (or permeation rate) plays a significant role in such condition in addition to the other parameters, it seems that the relation for multiple parameters including H 2 permeation flux has not been proposed yet.…”

Section: Introductionmentioning

confidence: 99%

“…Based on previous studies (12), (14)- (16), (18)- (20) , in the case of a high permeation ratio, the effect of feed flow rate on permeation characteristics for flat sheet Pd/Ag membrane was less explored, unlike that for the long tubular type membrane (12), (14)- (17) . Therefore, in our study, the effect of the feed flow rate on permeation characteristics for such type of membrane was investigated experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…Different from other researchers who used supported membrane (14), (20) , our study used the unsupported membrane with stagnating flow at the upstream side of the membrane surface, to study the effect of feed flow rate fundamentally without considering any possible influence from metal support (21) . In addition, the experimental results are discussed using an equation (22) that takes into account the effect of H 2 permeation itself, in which this equation demonstrates the relation for multiple variables (20) that depend on each other. The estimation by the equation for the case of hydrogen mixture is quantitatively reconsidered by taking into account the hydrogen concentration decrease at the membrane surface of the upstream side due to permeation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Feed Flow Rate of Hydrogen Mixture on Hydrogen Permeation for Flat Sheet Pd/Ag Membrane with Stagnating Flow

Faizal

Kizu

Kawamura

et al. 2013

JTST

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The effect of feed flow rate of hydrogen mixture on the H 2 permeation for a flat sheet Pd/Ag membrane with stagnating flow at the upstream side was investigated experimentally and theoretically. A 77wt.% Pd/23wt.% Ag flat sheet membrane with 25μm thickness and 0.02m diameter was used. The permeation rate of H 2 was investigated under various feed flow rates (1.489 × 10 -5 -2.976 × 10 -4 mol/s), for pressures of 0.20-0.30MPa and reference membrane temperatures of 523-723K. Experimental results demonstrated that when the feed flow rate is decreased, the H 2 permeation rate decreases. This is supposed to be due to the phenomena of hydrogen concentration decrease at the membrane surface of the upstream side, as a result of the effect of H 2 permeation itself. When a theoretical equation that takes into account the effect of H 2 permeation is used, the H 2 permeation mole flux can be predicted quantitatively by using the concentration of H 2 of the feed mixture. This shows that the diffusive transport effect plays an important role as well as the convective transport effect when determining H 2 concentration at the membrane surface. In addition, the normalization of the theoretical results shows that the trend of the decrease in the H 2 permeation mole flux with respect to the feed mole flux follows the first order lag function, regardless of the inlet H 2 partial pressures.

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Polymeric Membranes for Gas and Vapor Separations

Hosseini

Najari

2016

Nanostructured Polymer Membranes

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Theoretical analysis of concentration polarization in membrane modules for gas separation with feed inside the hollow-fibers

Cited by 83 publications

References 21 publications

Modeling of coupled mass and heat transfer through venting membranes for automotive applications

Modeling of coupled mass and heat transfer through venting membranes for automotive applications

Effect of Feed Flow Rate of Hydrogen Mixture on Hydrogen Permeation for Flat Sheet Pd/Ag Membrane with Stagnating Flow

Polymeric Membranes for Gas and Vapor Separations

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