...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of porous media >IMPACT OF ANISOTROPY ON GEOMETRICAL AND THERMAL CONDUCTIVITY OF METALLIC FOAM STRUCTURES
【24h】

IMPACT OF ANISOTROPY ON GEOMETRICAL AND THERMAL CONDUCTIVITY OF METALLIC FOAM STRUCTURES

机译：各向异性对金属泡沫结构的几何和热导率的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The thermo-physical properties of open cell metal foams depend on their microscopic structure. Various virtual ideal periodic isotropic foam samples having circular, square, hexagon, diamond, and star strut cross sections with various orientations are realized in the porosity range from 60 to 95%. The anisotropy of the original foam sample is then realized by elongating in one direction by a factor Omega, while a factor of 1/root Omega is applied along the two perpendicular directions to conserve the porosity of the original sample. A generalized analytical model of geometrical parameters has been proposed and all results are fully compared with the original measured data. Three-dimensional heat conduction numerical simulations at the pore scale have been performed, which allow determining the macroscale physical properties, such as the effective thermal conductivity, using the volume averaging technique. Two analytical models are derived simultaneously in order to predict the intrinsic solid phase conductivity (lambda(s)) and effective thermal conductivity (lambda(eff)). A modified correlation term (F) is introduced in the analytical resistor model to take into account the thermal conductivities of constituent phases and a modified Lemlich model is derived. The analytical results of the effective thermal conductivity are compared with the numerical data and excellent agreement is observed.
机译：开孔金属泡沫的热物理性质取决于其微观结构。在孔隙率从60％到95％的范围内实现了具有圆形，正方形，六边形，菱形和星形支柱横截面且具有不同方向的各种虚拟理想周期性各向同性泡沫样品。然后，通过在一个方向上伸长一个因子Omega来实现原始泡沫样品的各向异性，而沿两个垂直方向施加的系数为1 /根Omega，以保留原始样品的孔隙率。提出了几何参数的通用分析模型，并将所有结果与原始测量数据进行了充分比较。在孔尺度上进行了三维热传导数值模拟，可以使用体积平均技术确定宏观尺度的物理性质，例如有效的热导率。同时导出两个分析模型，以预测本征固相电导率（λ）和有效热导率（lambda（eff））。在分析电阻器模型中引入了一个修改的相关项（F），以考虑到组成相的热导率，并导出了一个修改的Lemlich模型。将有效导热系数的分析结果与数值数据进行了比较，并观察到了极好的一致性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号