Membrane and Water Treatment

  • 제2권3호
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  • Pages.159-173
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  • 2011
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  • 2005-8624(pISSN)
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  • 2092-7037(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Heat and mass transfer analysis in air gap membrane distillation process for desalination

  • Pangarkar, Bhausaheb L. (Sir Visvesvaraya Institute of Technology, University of Pune) ;
  • Sane, Mukund G. (National Chemical Laboratory)
  • 투고 : 2011.04.21
  • 심사 : 2011.07.11
  • 발행 : 2011.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

The air gap membrane distillation (AGMD) process was applied for water desalination. The main objective of the present work was to study the heat and mass transfer mechanism of the process. The experiments were performed on a flat sheet module using aqueous NaCl solutions as a feed. The membrane employed was hydrophobic PTFE of pore size 0.22 ${\mu}m$. A mathematical model is proposed to evaluate the membrane mass transfer coefficient, thermal boundary layers' heat transfer coefficients, membrane / liquid interface temperatures and the temperature polarization coefficients. The mass transfer model was validated by the experimentally and fitted well with the combined Knudsen and molecular diffusion mechanism. The mass transfer coefficient increased with an increase in feed bulk temperature. The experimental parameters such as, feed temperature, 313 to 333 K, feed velocity, 0.8 to 1.8 m/s (turbulent flow region) were analyzed. The permeation fluxes increased with feed temperature and velocity. The effect of feed bulk temperature on the boundary layers' heat transfer coefficients was shown and fairly discussed. The temperature polarization coefficient increased with feed velocity and decreased with temperature. The values obtained were 0.56 to 0.82, indicating the effective heat transfer of the system. The fouling was observed during the 90 h experimental run in the application of natural ground water and seawater. The time dependent fouling resistance can be added in the total transport resistance.

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참고문헌

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  2. Numerical investigation of air gap membrane distillation (AGMD): Seeking optimal performance vol.424, 2017, https://doi.org/10.1016/j.desal.2017.10.001
  3. Review of membrane distillation process for water purification vol.57, pp.7, 2016, https://doi.org/10.1080/19443994.2014.985728
  4. Assessment of direct contact membrane distillation under different configurations, velocities and membrane properties vol.185, 2017, https://doi.org/10.1016/j.apenergy.2016.05.020
  5. Theoretical and experimental analysis of multi-effect air gap membrane distillation process (ME-AGMD) vol.3, pp.3, 2015, https://doi.org/10.1016/j.jece.2015.07.017
  6. the low energy Direct Contact Membrane Distillation (DCMD) vol.74, pp.1953-8189, 2019, https://doi.org/10.2516/ogst/2018077