Liquid aerosols are found in many industrial sectors, particularly in the mechanical industry (oil mists). Granular bed (GB) filtration could be an interesting means for the removal of these liquid aerosols, due to their high storage capacity, robustness and low maintenance requirements. The aim of the study was to establish the filtration performance (filtration efficiency, pressure drop) of a fixed granular bed during filtration and its clogging by a liquid aerosol. Three grades of sand, obtained by sieving 100–200, 200–355 and 355–500 μm and glass beads of 140 μm diameter were used as the granular medium. The evolution of filtration efficiency and pressure drop of the GB was monitored during clogging with a DEHS aerosol of MMAD = 0.7 μm. Our measurements show that the filtration performance of granular beds during clogging was very similar to that observed for fibrous media. The fraction of the GB pore volume occupied by liquid when the drainage plateau is reached was between 28 and 33%. The GB reaches a drainage stage whose pressure drop can be correctly predicted using a model described for fibrous media.

液体气溶胶存在于许多工业部门，特别是机械工业（油雾）。颗粒床 (GB) 过滤可能是去除这些液体气溶胶的一种有趣方式，因为它们具有高存储容量、坚固性和低维护要求。该研究的目的是确定固定颗粒床在过滤过程中的过滤性能（过滤效率、压降）及其被液体气溶胶堵塞。通过筛分 100-200、200-355 和 355-500 μm 获得的三个等级的沙子和直径为 140 μm 的玻璃珠用作颗粒介质。在用 MMAD = 0.7 μm 的 DEHS 气溶胶堵塞期间监测 GB 的过滤效率和压降的演变。我们的测量表明，颗粒床在堵塞过程中的过滤性能与观察到的纤维介质非常相似。当达到排水平台时，GB 孔隙体积中液体所占的比例在 28% 到 33% 之间。GB 达到排水阶段，其压降可以使用为纤维介质描述的模型正确预测。