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DOI: 10.2172/1247131
报告号: Final Report:DOE-YALE--15741
报告题名:
Freezing in porous media: Phase behavior, dynamics and transport phenomena
作者: Wettlaufer, John S. [Yale Univ., New Haven, CT (United States)]
出版年: 2012
发表日期: 2012-12-21
总页数: 2
国家: 美国
语种: 英语
英文关键词: Premelting ; Thermomolecular Pressure ; Frost Heave
中文主题词: 冰冻 ; 散射 ; ; X射线 ; 冰冻(期)
主题词: FROST ; SCATTERING ; X-RAY
英文摘要: This research was focused on developing the underlying framework for the mechanisms that control the nature of the solidification of a broad range of porous media. To encompass the scope of porous media under consideration we considered material ranging from a dilute colloidal suspension to a highly packed saturated host matrix with a known geometry. The basic physical processes that occur when the interstitial liquid phase solidifies revealed a host of surprises with a broad range of implications from geophysics to materials science and engineering. We now understand that ostensibly microscopic films of unfrozen liquid control both the equilibrium and transport properties of a highly packed saturated host matrix as well as a rather dilute colloidal suspension. However, our description of the effective medium behavior in these settings is rather different and this sets the stage for the future research based on our past results. Once the liquid phase of a saturated relatively densely packed material is frozen, there is a rich dynamical behavior of particles for example due to the directed motion driven by thermomolecular pressure gradients or the confined Brownian motion of the particles. In quite striking contrast, when one freezes a dilute suspension the behavior can be rather more like that of a binary alloy with the particles playing the role of a ``solute''. We probed such systems quantitatively by (i) using X ray photon correlation spectroscopy (XPCS) and Small Angle X-ray Scattering (SAXS) at the Advanced Photon Source at Argonne (ii) studying the Argonne cell in the laboratory using optical microscopy and imagery (because it is not directly visible while in the vacuum can). (3) analyzed the general transport phenomena within the framework of both irreversible thermodynamics and alloy solidification and (4) applied the results to the study of the redistribution of solid particles in a frozen interstitial material. This research has gone a long way towards establishing a quantitative foundation for a wide class of problems in environmental and technological settings.
URL: http://www.osti.gov/scitech/servlets/purl/1247131
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资源类型: 研究报告
标识符: http://119.78.100.158/handle/2HF3EXSE/40430
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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Wettlaufer, John S. [Yale Univ., New Haven, CT . Freezing in porous media: Phase behavior, dynamics and transport phenomena. 2012-01-01.
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