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Stability and Negative Pressure in Bulk and Confined Liquids

机译：散装和密闭液体的稳定性和负压

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摘要

Negative pressure in liquids - especially in confined systems, like capillaries - often acts as a cohesive force between the solid walls, surrounding the liquid. These forces are responsible for various processes and phenomena, like sap transport in trees or mud stability/mud slides of granular systems (like soil). Due to the metastability of the liquids under negative pressure, different properties (including the limit of stability) cannot be measured directly because the metastable state might equilibrate back to stable ones (liquid + vapour) by cavitation, before the end of the measurement. Therefore it would be crucial to have an equation of state to describe the behavior of liquids (especially for water) in this region. We are going to present some result - comparing experimental data, molecular dynamic simulations and some analytical calculations -, showing which equations could be used in the metastable region and which should be the special pre-cautions taken during their use.
机译：液体中的负压（尤其是在毛细管等密闭系统中）通常是围绕液体的固体壁之间的内聚力。这些力负责各种过程和现象，例如树木中的树液运输或颗粒系统（例如土壤）的泥浆稳定性/泥浆滑坡。由于液体在负压下具有亚稳态，因此无法直接测量不同的属性（包括稳定性极限），因为在测量结束之前，亚稳状态可能会因气蚀作用而回到稳定状态（液体+蒸气）。因此，至关重要的是要有一个状态方程来描述该区域中液体（尤其是水）的行为。我们将给出一些结果-比较实验数据，分子动力学模拟和一些分析计算-表明哪些方程式可用于亚稳区域，哪些方程式在使用过程中应特别注意。

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  • 会议地点 Ein Bokek(IL)
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    Attila R. Imre;

  • 作者单位

    HAS Centre for Energy Research, H-1525 Budapest, POB 49, Hungary Institute of Physical Chemistry, University of Cologne, Luxemburger Str. 116,D-50939 Koeln, Germany;

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