微米尺度不锈钢丝网填料阻力特性研究

Micron-scale Stainless Steel Wire Mesh Packing Resistance Characteristics

丝网作为典型的多孔介质材料,常用于脉管回热器、斯特林回热器和固体过滤器等。本文以微米尺度不锈钢丝网作为多孔介质填料,由丝网材料特性得到孔隙率、黏性阻力因子和惯性阻力因子等参数。通过对不同丝网厚度和不同渐扩口开度等物理模型的组合进行数值仿真,获得了不锈钢丝网填料的阻力特性。结果表明:当丝网填料厚度由0.2 mm增大到0.8 mm时,压降随丝网厚度增大呈线性增大的关系;渐扩口开度由30°增加到60°,流体通过丝网前后运动状态无明显变化;多孔介质内部流动状态为层流时,压降与质量流量成正比关系。

As a typical porous media material,wire mesh is often used in pulse tube regenerators,Stirling regenerators,solid filters,etc.In this paper,micron-scale stainless steel wire mesh is used as the porous medium filler,and the porosity,viscous resistance factor,inertial resistance factor and other parameters are obtained from the characteristics of the wire mesh material.The resistance characteristics of stainless-steel wire mesh packing are obtained by numerical simulation of the combination of physical models such as different wire mesh thicknesses and different flaring openings.The results show that when the thickness of the wire mesh packing increases from 0.2 mm to 0.8 mm,the pressure drop increases linearly.When the opening of the divergent opening increases from 30°to 60°,there is no obvious change in the flow state of the fluid before and after passing through the wire mesh.When the internal flow state in the porous medium is laminar flow,the pressure drop is proportional to the mass flow rate.