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Studying Cracking and Oil Invasion in Porous Medium During Drying.

机译：研究干燥过程中多孔介质中的开裂和油浸。

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摘要

We study two interesting phenomena occurred during the evaporation of solvent in porous medium: first, the cracking behavior; and second, the expanding mechanism and the collecting methods of the non-evaporative phase.;In the first part of this thesis, we visualize the cracking behavior of colloidal suspensions during drying by a confocal microscope. We develop an effective method which can completely eliminate cracking during drying: by adding emulsion droplets into colloidal suspensions, we can systematically decrease the amount of cracking, and eliminate it completely above a critical droplet concentration. We also find another effect that the emulsion droplets can bring: it varies the speed of air invasion and provides a powerful method to adjust drying rate. Besides, we investigate the samples' fundamental mechanical properties with a rheometer and clarify the underlying physical mechanism for the decreasing of crack amounts. With the effective control over cracking and drying rate, our study may find important applications in many drying and cracking related industrial processes.;In the second part of the thesis, we conduct a study on the expanding mechanism and collecting methods of the non-evaporative phase in porous medium, which is inspired by a practical pollution problem that occurs when oil spills to the sandy beach. We build a system in a smaller scale to mimic the practical pollution and investigate the distribution change of the polluting phase as the flushing cycle increases. We find an obvious expansion of the polluting phase after several flushing cycles in both hydrophilic and hydrophobic porous media, but with different distributions and expanding behaviors. We explained this difference by analyzing the pressure distribution in the system at the pore level. Finally, we develop two methods to concentrate the polluting phase in some particular regions, which is beneficial to collect and solve the practical pollution problem.
机译：我们研究了在多孔介质中溶剂蒸发过程中发生的两个有趣现象：第一，开裂行为；第二，开裂行为。论文的第一部分，通过共聚焦显微镜观察了胶体悬浮液在干燥过程中的开裂行为。我们开发了一种可以完全消除干燥过程中龟裂的有效方法：通过将乳剂液滴添加到胶体悬浮液中，我们可以系统地减少龟裂的数量，并在临界液滴浓度以上完全消除龟裂。我们还发现乳液液滴可以带来的另一种效果：它改变了空气入侵的速度，并提供了一种调节干燥速率的有效方法。此外，我们使用流变仪研究了样品的基本力学性能，并阐明了降低裂纹数量的潜在物理机理。通过有效控制裂化和干燥速率，我们的研究可能会在许多干燥和裂化相关的工业过程中找到重要的应用。;第二部分，对非蒸发性的膨胀机理和收集方法进行了研究。多孔介质中的有机相，这是受到油泄漏到沙滩时发生的实际污染问题的启发。我们建立了一个较小规模的系统来模拟实际污染，并研究随着冲洗周期的增加污染相的分布变化。我们发现，在亲水性和疏水性多孔介质中，经过数次冲洗循环后，污染阶段明显扩展，但分布和膨胀行为不同。我们通过分析系统中孔隙水平的压力分布来解释这种差异。最后，我们开发了两种方法将污染阶段集中在某些特定区域，这有利于收集和解决实际的污染问题。

著录项

  • 作者

    Jin, Qiu.;

  • 作者单位

    The Chinese University of Hong Kong (Hong Kong).;

  • 授予单位 The Chinese University of Hong Kong (Hong Kong).;
  • 学科 Engineering Materials Science.;Engineering Environmental.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 87 p.
  • 总页数 87
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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