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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study of the effect of sodium chloride on drying of porous media: The crusty-patchy efflorescence transition
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Experimental study of the effect of sodium chloride on drying of porous media: The crusty-patchy efflorescence transition

机译：氯化钠对多孔介质干燥影响的实验研究：硬皮-斑点风化转变

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摘要

We present an experimental study of drying in the presence of dissolved sodium chloride. The process is characterized by the formation of a crystallized salt layer, referred to as efflorescence, at the evaporative surface of the porous medium. By varying the average size of the beads forming the porous medium, we show that the formation of the crystal layer does not affect significantly the drying process and can even enhance the drying rate when the beads are sufficiently large. By contrast, the crystal layer can greatly affect the drying process and even blocks or severely limit the evaporation process for sufficiently small beads. We therefore show the existence of two regimes, namely the blocking regime and the enhanced drying rate regime. It is shown that the two regimes correspond to two different types of efflorescence, referred to as crusty and patchy, respectively. Then by varying the initial salt concentration for a given bead size, we show that the interplay between drying and the efflorescence formation leads to a non-monotonous variation of the drying rate with the initial salt concentration when the efflorescence is patchy but not when the efflorescence is crusty. The crusty-patchy transition is finally discussed from a simple model of capillary rise in the efflorescence.
机译：我们提出了在溶解的氯化钠存在下干燥的实验研究。该方法的特征在于在多孔介质的蒸发表面上形成结晶的盐层，称为风化。通过改变形成多孔介质的珠粒的平均尺寸，我们表明晶体层的形成不会显着影响干燥过程，并且当珠粒足够大时，甚至可以提高干燥速率。相反，对于足够小的珠子，晶体层会极大地影响干燥过程，甚至阻塞或严重限制蒸发过程。因此，我们表明存在两种状态，即阻塞状态和增强的干燥速率状态。结果表明，两种处理方式分别对应于两种不同类型的风化作用，分别称为硬皮和斑块状。然后通过改变给定珠粒大小的初始盐浓度，我们发现干燥和风化形成之间的相互作用导致风化呈片状而不是风化时干燥速度随初始盐浓度的非单调变化。很硬最后，通过风化过程中毛细血管上升的简单模型讨论了硬壳-斑点过渡。

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  • 来源
  • 作者

    H. Eloukabi; N. Sghaier; S. Ben Nasrallah; M. Prat;

  • 作者单位

    Laboratoire d'Eudes des Systemes Thermiques et Energetiques de Monastir, tcole nationale d'lngenieurs de Monastir, 5000 Monastir, Tunisia;

    Laboratoire d'Eudes des Systemes Thermiques et Energetiques de Monastir, tcole nationale d'lngenieurs de Monastir, 5000 Monastir, Tunisia;

    Laboratoire d'Eudes des Systemes Thermiques et Energetiques de Monastir, tcole nationale d'lngenieurs de Monastir, 5000 Monastir, Tunisia;

    INPT, UPS, IMFT(Institut de Mecanique des Fluides de Toulouse), Universite de Toulouse, Allee Camille Soula, F-31400 Toulouse, France,CNRS, IMFT, F-31400 Toulouse, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    drying; porous medium; salt crystallization; efflorescence;

    机译：烘干;多孔介质盐结晶;风化;

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