多层金属纤维滤毡透气性能研究

研究了孔隙度与辅助层丝径对多层金属纤维滤毡透气性能的影响以及滤毡透气系数与孔隙度，孔径的关系，得出了三者之间关系的方程。研究表明，带有粗丝径辅助层的多层滤毡比同类型单层的透气性能好得多，且透气系数随辅助层丝径的增大而提高。所得到的经验方程可用来估算多层金属纤维滤毡的透气系数。

Study of the Permeability of a Metal Fiber Medium with Graded Pore Size

The influence of the porosity of a filter medium and the metal fiber diameter of additional layers of filter medium with graded pore size on air permeability has been investigated. The relationships of the air permeability of the metal fiber filter media to the porosity and the pore size, and an empirical equation for the permeability, the porosity and the pore size are obtained using a statical method. The results show that the air permeability of the filter medium which consists of a control layer and additional layers of thick fiber with gradient pore size is much higher than that of the medium with uniform pore size under the same conditions. The air permeability coefficient of the filter medium increases with the increasl of the fiber diameter of additional layers. The obtained empirical equation can be used for evaluating the air permeability coefficient of the metal fiber filter medium with gradient pore size.Correspondent: Liao Jichang, Professor, Northwest institute for Nonferrous Metal Resesearch, Xi' an 710016, P. R. China, Tel: 08629 626749