An experimentally optimized model for heat and mass transfer in direct contact membrane distillation

Andrjesdóttir, Ólöf; Ong, Chin Lee; Nabavi, Majid; Paredes, Stephan; Khalil, Ahmed S. G.; Michel, Bruno; Poulikakos, Dimos

doi:10.1016/j.ijheatmasstransfer.2013.07.051

Cited by 128 publications

(79 citation statements)

References 39 publications

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“…(3, 4, 5 and 6) which depicted the effects of increasing feed temperature, coolant temperature and feed flow rate respectively. Results shows good agreement between transition model prediction and experimental results of [23] and [8]. Fig.…”

Section: Resultssupporting

confidence: 62%

“…The results obtained were validated against the experimental work of T.Y. Cath et al [8] and O. Andrjesdóttir et al [23] to testify the best theoretical model to be employed in DCMD under the given experimental conditions. Results of prediction for different models of membrane permeability were depicted in Figs.…”

Section: Resultsmentioning

confidence: 80%

“…The estimated mean free path for water molecules in vapour phase at these temperatures are 1.27 × 10 -7 m and 1.49 × 10 -7 m respectively. For the given pore sizes of 2 × 10 -7 m as used by O. Andrjesdottir et al [23] and 4.5 × 10 -7 m as employed by T. Y. Cath [8], the Knudsen number were found to be 0.281 and 0.745 respectively.…”

Section: Resultsmentioning

confidence: 86%

“…As such we expect combined Knudsen-molecular diffusion kind of flow model to gives most accurate prediction of flux. To support the above claim, the developed code was used to predict the permeate flux, the predicted flux were validated against the experimental work of T. Y. Cath et al [8] and O. Andrjesdottir et al [23] as shown in Figs. (3, 4, 5 and 6) which depicted the effects of increasing feed temperature, coolant temperature and feed flow rate respectively.…”

Section: Resultsmentioning

confidence: 94%

“…At steady state, the overall heat transfer through the DCMD system is express as shown below; (23) Combination and manipulation of Eqs (15) to (20) …”

Section: Heat Transfermentioning

confidence: 99%

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Flux Prediction in Direct Contact Membrane Distillation

Lawal¹,

Khalifa²

2014

IJMMM

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Abstract-Membrane distillation (MD) is a potential mean of water desalination. MD is a thermally driven desalination technology that has been employed in four basic configurations. One of these configuration is Direct Contact Membrane Distillation (DCMD). In DCMD, both hot and cold solution is maintained in direct contact with micro porous hydrophobic membrane material. Heat and mass transfer analysis was performed on DCMD. Based on Kinetic theory of gas, the performance of different models of membrane permeability (coefficient) was investigated under different DCMD operating parameters (feed temperature, coolant temperature and feed flow rate). Knudsen number provides the guideline in identifying the type of model of mass transfer to be considered under any given experimental conditions.Results revealed that for a given pore size under the same simulation and experimental conditions, Transition (KnudsenMolecular diffusion) type of flow model predictions is in good agreement with the experimental results. Hence the best model to be consider for flux prediction in DCMD. The effect of membrane pore size was also studied. Results showed that permeate flux increases with increase in pore size up to the critical pore condition where the flux prediction remain constant (unchanged).Index Terms-Desalination, direct contact membrane distillation, flux prediction, hydrophobic membrane material.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 94%

“…At steady state, the overall heat transfer through the DCMD system is express as shown below; (23) Combination and manipulation of Eqs (15) to (20) …”

Section: Heat Transfermentioning

confidence: 99%

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Flux Prediction in Direct Contact Membrane Distillation

Lawal¹,

Khalifa²

2014

IJMMM

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Nodular structure and crystallinity of poly(vinylidene fluoride) membranes: Impact on the performance of direct‐contact membrane distillation for nutrient isolation

Yatim

Karim

Ooi

2018

J of Applied Polymer Sci

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The main objective of this study was to prepare a low‐surface‐energy poly(vinylidene fluoride) (PVDF) membrane distillation via changes in its surface morphology and crystallinity. We found that membranes prepared at different polymer concentrations with a dual coagulation bath showed distinctive differences in terms of their physical and chemical properties. We found that when the polymer concentration was increased, both the pore sizes and porosities of the membranes decreased. In addition, the polymer concentration also resulted in significant changes to the surface roughness and morphology of the membrane, which were manifested through varied nodule shapes and sizes. Higher polymer concentrations gave better wetting resistance (higher liquid entry pressure) because of the increasing hydrophobic α‐phase crystallinity but suffered from a lower porosity (lower vapor permeability). At a higher PVDF concentration, we expected that the thermal efficiency would be lower (because of the lower porosity); however, we observed an appreciable contrast phenomenon due to the increasing nonconductive α‐phase, and this lowered the thermal conductivity. These observations showed that the wettability of the membrane very much depended on the chemical properties of PVDF. The optimum membrane (20% PVDF) showed a consistent nutrient rejection of more than 99% with a membrane flux of 9.491 kg m2 h ± 0.1 at a feed temperature of 90 °C. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46866.

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Energetic Performance and Permeate Flux Investigation of Direct‐Contact Membrane Distillation for Seawater Desalination

Boubakri

Elgharbi

Bouguecha³

et al. 2020

Chem Eng & Technol

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The performance of the direct-contact membrane distillation (DCMD) process in desalting Mediterranean seawater was investigated. Theoretical and experimental optimization of various operating parameters was conducted. The effects of temperature differences, feed velocity, and membrane characteristics were studied. When using commercial polyvinylidene fluoride membranes, the vapor transfer throughout the membrane pores is dominated by the Knudsen-molecular diffusion model. Maximum permeate flux was obtained when increasing temperature, feed velocity, membrane pore size, and porosity and decreasing membrane tortuosity and thickness. Thermal efficiency, gained output ratio, and specific thermal energy consumption were improved when increasing feed temperature. By application of the DCMD process to Mediterranean seawater, a high water quality was obtained.

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An experimentally optimized model for heat and mass transfer in direct contact membrane distillation

Cited by 128 publications

References 39 publications

Flux Prediction in Direct Contact Membrane Distillation

Flux Prediction in Direct Contact Membrane Distillation

Nodular structure and crystallinity of poly(vinylidene fluoride) membranes: Impact on the performance of direct‐contact membrane distillation for nutrient isolation

Energetic Performance and Permeate Flux Investigation of Direct‐Contact Membrane Distillation for Seawater Desalination

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