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    Downstream variations of air-gap membrane distillation and comparative study with direct contact membrane distillation: A modelling approach

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    Name:
    MANUSCRIPT Abolfazi Griffith Univ Australia 2021.pdf
    Size:
    2.213Mb
    Format:
    PDF
    Description:
    Accepted Manuscript
    Embargo End Date:
    2024-01-04
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    Type
    Article
    Authors
    Ansari, Abolfazl
    Galogahi, Fariba Malekpour
    Thiel, David V.
    Helfer, Fernanda
    Millar, Graeme
    Soukane, Sofiane
    Ghaffour, NorEddine cc
    KAUST Department
    Water Desalination and Reuse Research Center (WDRC)
    Environmental Science and Engineering Program
    Biological and Environmental Science and Engineering (BESE) Division
    Date
    2022-01-04
    Embargo End Date
    2024-01-04
    Submitted Date
    2021-08-26
    Permanent link to this record
    http://hdl.handle.net/10754/674976
    
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    Abstract
    Air-Gap Membrane Distillation (AGMD) promises to reduce heat loss in membrane distillation. Most AGMD models are one-dimensional and do not consider the downstream variations. In addition, a linear function of vapour pressure is used, which either relies on experimentally determined parameters or a simplified mass transfer resistance to model the water permeate flux. This study introduces a new, improved model that simultaneously considers both heat and mass transfer in the AGMD process by coupling the continuity, momentum, and energy equations. A novel precise logarithmic function of vapour pressure was derived to model the water permeate flux, independent of experimentally determined parameters. By varying the inlet temperature, Reynolds number, inlet concentration, and air-gap thickness, the performance of AGMD was evaluated. The results revealed that our model improved the water flux prediction from more than 10% to less than 4% deviation from experimental results. Among the operating conditions, only increasing the Reynolds number improved all the system performance metrics, including higher water flux and lower temperature and concentration polarisation effects. Results were compared with Direct Contact Membrane Distillation (DCMD) outcomes and showed that unlike AGMD, DCMD suffers from a substantial decrease in water flux along the module. For DCMD, the exit water flux value decreased by 50% in comparison with the inlet value, while the water flux decreased by only 2% for AGMD, using a 1 mm air gap thickness.
    Citation
    Ansari, A., Galogahi, F. M., Thiel, D. V., Helfer, F., Millar, G., Soukane, S., & Ghaffour, N. (2022). Downstream variations of air-gap membrane distillation and comparative study with direct contact membrane distillation: A modelling approach. Desalination, 526, 115539. doi:10.1016/j.desal.2021.115539
    Publisher
    Elsevier BV
    Journal
    Desalination
    DOI
    10.1016/j.desal.2021.115539
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S001191642100610X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.desal.2021.115539
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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