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Evaporation with sodium chloride crystallization in a capillary tube

机译:在毛细管中用氯化钠结晶蒸发

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摘要

Sodium chloride crystallization induced by evaporation of aqueous solution is studied from visualization experiments in a circular capillary tube. In agreement with recent studies, the onset of crystallization is observed with a significant supersaturation. Detailed information on the precipitation kinetics and transport of ions is obtained from numerical computations of the ion mass fraction field during the evaporation process. It is shown that the precipitation kinetics is fast compared to transport so that the crystal growth is mostly controlled by the transport. This offers possibles implifications for analyzing more involved situations such as crystallization in porous media. The fact that the significant super- saturation does not lead to tube damage is explained.
机译:在圆形毛细管中通过可视化实验研究了由水溶液蒸发引起的氯化钠结晶。与最近的研究一致,观察到结晶的开始具有明显的过饱和。有关沉淀动力学和离子迁移的详细信息,可从蒸发过程中离子质量分数场的数值计算获得。结果表明,与迁移相比,沉淀动力学快,因此晶体生长主要受迁移控制。这为分析更复杂的情况(例如在多孔介质中结晶)提供了可能的含义。解释了明显的过饱和不会导致管损坏的事实。

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