Reverse Osmosis Desalination Module: Three Dimensional, Transient Analyses

Anqi, Ali E.; Usta, Mustafa; Alrehili, Mohammed; Alkhamis, Nawaf; Öztekin, Alparslan

doi:10.1115/imece2016-65890

Cited by 3 publications

(4 citation statements)

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“…10d and e show the concentration and temperature contours over the membrane surface. The correlation between the high wall shear stress regions and regions with the low concentration polarization is not as obvious as in the reverse osmosis separation modules [35,37]. It is clear that the temperature polarization is more intense in regions with high vapor permeation, as expected since the temperature polarization is induced by the vaporization.…”

Section: Mitigation Of Polarization -Module Containing Spacersmentioning

confidence: 84%

“…The concentration polarization is a common issue in most membrane desalination processes [34][35][36][37]. As the water vapor passes through the membrane, the solute accumulates on the membrane surface causing the concentration polarization.…”

Section: 3816 44 46 13mentioning

confidence: 99%

“…It is also important to mention that the membrane fouling occurs for the continuous operation of membrane separation. The regions where fouling would occur are strongly correlated to the high concentration polarization regions over the membrane surface [35]. The remedies alleviating the concentration polarization should be considered in the design of these modules.…”

Section: Parametric Study -Empty Modulementioning

confidence: 99%

“…where D is the diffusivity and ρ is feed density. The fouling induced by the concentration polarization would add extra resistance to the transfer of water vapor through the membrane and will reduce the life span of the membrane [34,35,37]. It is deduced from results that the use of mixing promoters is desired especially during operations with the higher inlet feed temperature due to the occurrence of more intense concentration and temperature polarization at these conditions.…”

Section: Parametric Study -Empty Modulementioning

confidence: 99%

See 3 more Smart Citations

Effect of membrane properties and operational parameters on systems for seawater desalination using computational fluid dynamics simulations

Alwatban¹,

Alshwairekh²,

Alqsair³

et al. 2019

Desalination and Water Treatment

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Computational fluid dynamic simulations were conducted to investigate the effects of the membrane properties and operational parameters on the system performance in three-dimensional direct contact membrane distillation modules. The membrane thickness, porosity, pore size, feed flow rate, and the inlet feed temperature were considered in the parametric study. Water flux, temperature and concentration polarization characteristics of the membrane were determined. The net-type spacers were used in the feed and permeate channel to mitigate the polarization and enhance the flux performance of the separation module for various flow rates. The laminar model was employed to characterize the velocity, temperature and concentration field in the empty channels and the k-ω shear stress turbulence model was employed in the module containing spacers. The permeation flux, intensity of temperature and concentration polarization increase as the thickness is reduced, and the porosity and the pore size are increased. The rate of permeation and polarizations are increased with increase in flow rate. The presence spacers enhance the membrane flux performance more than 50% and mitigate polarizations up to 30%.

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Section: Mitigation Of Polarization -Module Containing Spacersmentioning

confidence: 84%

Section: 3816 44 46 13mentioning

confidence: 99%

Section: Parametric Study -Empty Modulementioning

confidence: 99%

Section: Parametric Study -Empty Modulementioning

confidence: 99%

See 2 more Smart Citations

Effect of membrane properties and operational parameters on systems for seawater desalination using computational fluid dynamics simulations

Alwatban¹,

Alshwairekh²,

Alqsair³

et al. 2019

Desalination and Water Treatment

Self Cite

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Comparison of Sweeping Gas and Direct Contact Membrane Distillation: Module Length Effect

Alqsair

Alshwairekh

Alwatban

et al. 2020

ASME 2020 Heat Transfer Summer Conference

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Computational fluid dynamics simulations are conducted to compare the effect of module length in sweeping gas and direct contact membrane distillation systems for seawater desalination processes. In this work, the effect of temperature and concentration on the flux performance and temperature and concentration polarization characteristics are studied. CFD simulations are conducted in a three-dimensional module to characterize the steady-state velocity, temperature, and concentration field in the feed and permeate channel. The Reynolds number for the feed and the permeate stream is set to 500 and 1500, and thus the laminar flow model is adapted for each channel. The membrane properties are fixed in all cases considered. It is revealed that the local variation of the vapor flux, TPC, and CPC varies with module length in SGMD systems. However, the average values along the membrane in both module lengths do not vary much. Remedies for mitigating temperature polarization should be considered for future studies.

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The Effect of the Embedded Spacers on the Performance of Direct Contact Membrane Distillation System Operating With Different Inlet Feed Temperature

Alwatban

Alshwairekh

Alqsair

et al. 2019

Volume 7: Fluids Engineering

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Computational fluid dynamics simulations are used to model the effect of the inlet feed temperature in direct contact membrane distillation modules. Embedded spacers are used as a local mixing promoter tool. Net-type spacers of angle 45° are used as spacers. The presence of the spacers will mitigate the temperature and concentration polarization effects. The calculation of the vapor flux through the membrane is based on the Dusty-Gas model. The membrane is considered as a functional surface, and the embedded spacers are treated as impermeable surfaces. The vapor flux equation couples the variation of the vapor flux in the feed and the permeate channel with the variation of the feed concentration along the membrane. The flow is considered turbulent in channels containing embedded spacers. The k–ω SST turbulent model is used to characterize the steady-state turbulent structures inside the flow channels. The flow rate in the feed and the permeate channels is fixed. The membrane properties are also fixed. The inlet feed temperature is varying while fixing the inlet permeate temperature. The results indicate that the embedded spacers increase the vapor flux permeation while the temperature and concentration polarizations are mitigated. As the inlet feed temperature is increased, the effect of the embedded spacers becomes more significant.

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Reverse Osmosis Desalination Module: Three Dimensional, Transient Analyses

Cited by 3 publications

References 0 publications

Effect of membrane properties and operational parameters on systems for seawater desalination using computational fluid dynamics simulations

Effect of membrane properties and operational parameters on systems for seawater desalination using computational fluid dynamics simulations

Comparison of Sweeping Gas and Direct Contact Membrane Distillation: Module Length Effect

The Effect of the Embedded Spacers on the Performance of Direct Contact Membrane Distillation System Operating With Different Inlet Feed Temperature

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