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Numerical study of evaporation by mixed convection of a binary liquid film

Author

Listed:
  • Nasr, Abdelaziz
  • Debbissi Hfaiedh, Chokri
  • Ben Nasrallah, Sassi

Abstract

This paper deals with a numerical analysis of the evaporation of binary liquid film. The film is falling down on one plate of a vertical channel under mixed convection channel. The first plate of a vertical channel is externally submitted to a uniform heated flux q1 while the second one (y=d) is dry and isothermal. The liquid mixture consists of water (the more volatile component) and ethylene glycol while the gas mixture has three components: dry air, water vapour and ethylene-glycol vapour. The results concern the effects of the inlet parameters in the gas and in the liquid film on the interfacial pressure, temperature and concentration profiles. The evolutions of the heat fluxes and of the water and mixture evaporation rates have been analysed. Results obtained show, in particular, that it is possible to increase the accumulated evaporation rate of water and of the liquid mixture when the inlet liquid concentration of ethylene glycol (the less volatile component) is less than 40%. This result has been explained by the fact that an increase of the inlet liquid concentration of ethylene glycol has two antagonistic effects on the accumulated evaporation rates of water and of liquid mixture.

Suggested Citation

  • Nasr, Abdelaziz & Debbissi Hfaiedh, Chokri & Ben Nasrallah, Sassi, 2011. "Numerical study of evaporation by mixed convection of a binary liquid film," Energy, Elsevier, vol. 36(5), pages 2316-2327.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:5:p:2316-2327
    DOI: 10.1016/j.energy.2011.02.039
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    References listed on IDEAS

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    1. Abu-Hijleh, Bassam A/K & Mousa, Hasan A., 1997. "Water film cooling over the glass cover of a solar still including evaporation effects," Energy, Elsevier, vol. 22(1), pages 43-48.
    2. Hongfei, Zheng, 2001. "Experimental study on an enhanced falling film evaporation–air flow absorption and closed circulation solar still," Energy, Elsevier, vol. 26(4), pages 401-412.
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