吕兆华. 泡沫型多孔介质中非达西流动特性的研究[J]. 工程力学, 1998, 15(2): 57-64.
引用本文: 吕兆华. 泡沫型多孔介质中非达西流动特性的研究[J]. 工程力学, 1998, 15(2): 57-64.
Lu Zhaohua. A STUDY OF NON DARCY FLOW THROUGH POROUS FOAM MEDIA[J]. Engineering Mechanics, 1998, 15(2): 57-64.
Citation: Lu Zhaohua. A STUDY OF NON DARCY FLOW THROUGH POROUS FOAM MEDIA[J]. Engineering Mechanics, 1998, 15(2): 57-64.

泡沫型多孔介质中非达西流动特性的研究

A STUDY OF NON DARCY FLOW THROUGH POROUS FOAM MEDIA

  • 摘要: 本文通过将泡沫材料复杂结构进行几何简化,形成立方框架结构,利用简化的等效单元流道,提出一种数理模型,它既考虑固体网架表面对流体的摩擦阻力作用,也考虑网架迎着流向的迎风阻力(形状阻力),得到了在多孔介质中非达西流的压力降与流速的关系式。并用简化的框架结构导出了预估泡沫材料渗透率k和F-W关系式中流速平方项的系数F.另外,还通过专用的实验装置测定了四种不同孔径泡沫陶瓷的kF.结果表明,根据所给模型理论预测的结果与实验值一致性较好,在泡沫型多孔材料的应用中能够提供流动特性的相关数据。

     

    Abstract: Simplifying the complicated structure of the foam matrix so as to get a regular cube frame of geometry, and utilizing the equivalent element channel, a physical model, which takes accounts of the inertial effects caused by the matrix form drag against the flow as well as the effects coming from the surface friction drag between fluid and solid medium, was proposed. A relation between pressure gradient and velocity for the non Darcy flow through porous media was formulated. Thereby, the expressions of predicting the permeability k of foam materials and the coeffieient F of square term of velocity in F-W relation were derived by the cube frame. Measurements of k and F of the foam ceramics for four pore sizes have also been made in a special apparatus. The results show that the theoretical predictions, based on the model presented in this paper, agree with the experiment values and provide corresponding data of the flow feature for the application of porous foam materials.

     

/

返回文章
返回