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首页> 外文会议>IUYAM Symposium on Theoretical and Numerical Methods in Continuum Mechanics of Porous Materials, Sep 5-10, 1999, Stuttgart, Germany >Geometry Effects on Sound in Porous Media
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Geometry Effects on Sound in Porous Media

机译：多孔介质中声音的几何效应

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摘要

The problem of sound propagation in rigid porous media is investigated. Two so-called scaling functions are introduced to describe the dynamic viscous and thermal interaction of the pore fluid and the porous structure. These scaling functions are characterized by the viscous and thermal permeabilities κ_0 and κ′_0, the viscous and thermal tortuosities α_∞, α_0, and α′_0, and the characteristic length scales Λ and Λ′. These parameters can be numerically evaluated from steady-state descriptions. For a pore geometry consisting of an arrangement of cylinders, the characteristic parameters are presented. The full microscopic dynamic flow and heat problems for this configuration were solved, averaged, and compared with the scaling functions. We found that for this configuration the scaling functions gave an accurate description of the oscillatory flow and heat phenomena.
机译：研究了在刚性多孔介质中声音传播的问题。引入了两个所谓的缩放函数来描述孔隙流体和多孔结构的动态粘性和热相互作用。这些缩放函数的特征在于粘性和热导率κ_0和κ'_0，粘性和热曲折度α_∞，α_0和α'_0以及特征长度尺度Λ和Λ'。这些参数可以从稳态描述中进行数值评估。对于由圆柱体排列组成的孔隙几何形状，给出了特征参数。解决了此配置的全部微观动态流和热问题，对其求平均并与缩放函数进行比较。我们发现，对于这种配置，缩放功能可以准确描述振荡流和热现象。

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