Experimental study of concentration polarization in a crossflow reverse osmosis system using Digital Holographic Interferometry

Fernández-Sempere, J.; Ruiz-Beviá, F.; García-Algado, P.; Salcedo‐Díaz, Raquel

doi:10.1016/j.desal.2010.03.010

Cited by 33 publications

(22 citation statements)

References 32 publications

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“…This experimental research completes a previous one where concentration profiles and permeate fluxes in crossflow RO were studied [22]. A new longer module has been used to visualize the built up of the polarization layer along the membrane channel.…”

Section: Introductionmentioning

confidence: 75%

“…Both systems are the same to that explained in a previous paper [22]. These two assemblies are coupled on the same work table, being the RO module the common element.…”

Section: Experimental Set-upmentioning

confidence: 89%

“…The module is similar to that described in a previous paper [22], but with some marked changes to allow the study of the evolution of the concentration polarization layer along the permeate channel. The main difference is its size, more than twice longer than the previously used module.…”

Section: Experimental Set-upmentioning

confidence: 94%

“…Physical properties (diffusion coefficient, density and osmotic pressure) of the solute solutions were obtained from the literature [22]. Permeability and rejection of the membrane, Filmtec XLE-2540, were experimentally obtained.…”

Section: Methodsmentioning

confidence: 99%

“…Digital Holographic Interferometry (DHI) has been used in this research and was previously applied to the study of the CP layer [22,23]. It is an interferometric technique very similar to classical Holographic Interferometry previously used [24][25][26][27] but replacing the holographic plate, which needs to be photographically developed, by the CCD chip of a video camera [28].…”

Section: Introductionmentioning

confidence: 99%

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Visualization and modeling of the polarization layer in crossflow reverse osmosis in a slit-type channel

Salcedo‐Díaz

García-Algado

Garcia‐Rodriguez

et al. 2014

Journal of Membrane Science

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The evolution of the concentration polarization layer during crossflow reverse osmosis in a slit channel has been studied. Digital Holographic Interferometry allows visualizing the polarization layer as an interference fringe pattern. An especial module with four windows has been designed to see the development of the polarization layer along the membrane channel. Several experiments with a constant transmembrane pressure of 6 bar, three different feed concentrations (3, 6 and 9 kg/m 3 ) and three different Re (13, 38 and 111) had been carried out. The process has been modelled simulating the experimental conditions. The computed results were found to be consistent with the experimental ones. All the experiments show a continuous increase of the polarization layer along the channel, regardless of the crossflow velocity, except near the outlet of the cell due to an edge effect. This increase in the polarization layer is greater at lower Re, although it does not influence very much the permeate flux. In contrast, what substantially affects the permeate flux, much more than Re number, is the feed concentration due to its osmotic pressure.

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Section: Introductionmentioning

confidence: 75%

“…Both systems are the same to that explained in a previous paper [22]. These two assemblies are coupled on the same work table, being the RO module the common element.…”

Section: Experimental Set-upmentioning

confidence: 89%

Section: Experimental Set-upmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Visualization and modeling of the polarization layer in crossflow reverse osmosis in a slit-type channel

Salcedo‐Díaz

García-Algado

Garcia‐Rodriguez

et al. 2014

Journal of Membrane Science

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Buoyancy effect on the ultrafiltration of PEG 10,000. Visualization by digital holographic interferometry

et al. 2012

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Digital holographic interferometry has been used to visualize the buoyancy effects on dead‐end ultrafiltration of PEG 10,000. Sets of experiments have been carried out with the membrane in different orientations (90°, 180°), using a feed concentration of PEG 10,000 ranging 5–12.5 kg/m3. These results were compared with those obtained in previous research with the cell placed in its natural position (0°). The interferometric fringe patterns obtained in this research were very different from those obtained previously. Whereas at the 0° position, an increasing number of interferometric fringes appeared parallel to the membrane surface at 90 and 180° positions, the number of interference fringes was much lesser and, with the 180° orientation, slightly curved protuberances appeared after a short period of time that, like big drops, fell downward from the membrane surface. The consequence is a decrease of the polarization layer and an enhancement of the membrane performance. © 2012 American Institute of Chemical Engineers AIChE J, 2012

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Modeling of the variations of permeate flux, concentration polarization, and solute rejection in nanofiltration system

Zhang

Hou

et al. 2018

AIChE Journal

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A numerical model is presented and experimentally validated for predicting the local concentration polarization and the related separation performance of nanofiltration (NF) system. The model combines computational fluid dynamics for describing the transport phenomena in NF channel, with Spiegler-Kedem-Katchalsky model for considering the permeation properties through NF membrane. Particular attention is given to the modeling of spatially varied solute rejection and solute transport through membrane, representing essential distinctions from the modeling of reverse osmosis (RO) membrane. Also, an experimental-numerical framework is proposed to determine model parameters related to solute transport, including reflection coefficient and solute permeability as functions of feed solute concentration. The usefulness of this model is highlighted by predicting concentration polarization under different conditions related to operations, membrane systems (NF vs. RO), and solute types (NaCl vs. MgSO 4 ). Also, the contributions by convection and diffusion to solute transport are clarified, benefiting by the modeling of solute transport.

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Experimental study of concentration polarization in a crossflow reverse osmosis system using Digital Holographic Interferometry

Cited by 33 publications

References 32 publications

Visualization and modeling of the polarization layer in crossflow reverse osmosis in a slit-type channel

Visualization and modeling of the polarization layer in crossflow reverse osmosis in a slit-type channel

Buoyancy effect on the ultrafiltration of PEG 10,000. Visualization by digital holographic interferometry

Modeling of the variations of permeate flux, concentration polarization, and solute rejection in nanofiltration system

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