Abstract An innovative permselectivity test bench is used in order to determine the axial distribution of two properties of a stainless steel porous tube, which are the permeance and the gas selectivity. The effects of the operating conditions (inlet mass flowrate and inlet pressure) have been studied. A new radial form of the gas permeability equation has been developed for this work and its relationship with Darcy‘s permeability is established for a cylindrical configuration of the test. The pressure variation along the centre axis of the tube is determined. The effects of this pressure variation on the physical properties of gases such as density and viscosity are determined and their influence on the selectivity of gases is studied. It is found that the gas density and gas viscosity decrease along the flow. This decrease leads to an increase in the gas permeability for N 2 and a decrease for CO 2 . Consequently, the selectivity (N 2 /CO 2 ) increases. The obtained results can be useful to understand the factors affecting gas separation in case of a porous tube for continuous industrial processes.

中文翻译：

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多孔圆柱管的渗透率和理想选择性的轴向分布

摘要 为了测定不锈钢多孔管的渗透率和气体选择性这两个特性的轴向分布，采用了一种创新的选择性渗透率试验台。已经研究了操作条件（入口质量流量和入口压力）的影响。为这项工作开发了一种新的气体渗透率方程的径向形式，并为测试的圆柱形配置建立了它与达西渗透率的关系。确定沿管中心轴的压力变化。确定了这种压力变化对气体物理性质（如密度和粘度）的影响，并研究了它们对气体选择性的影响。发现气体密度和气体粘度沿流动减小。这种减少导致N 2 的气体渗透率增加和CO 2 的减少。因此，选择性（N 2 /CO 2 ）增加。获得的结果有助于了解在连续工业过程中使用多孔管时影响气体分离的因素。