过滤分离主要基于以下三种机理 直接拦截  惯性撞击 扩散拦截

直接拦截 : 液体中的基本过滤机制，本质是一种筛分效应，机械拦截颗粒，当颗粒大于流道孔径时即被该结构去除，通过搭桥作用,尺寸小于滤孔的颗粒也可被拦截，

惯性撞击:尺寸小于滤材孔径的颗粒的辅助拦截方式，流体携带的颗粒由于质量和线速度而具有直线运动的惯性，颗粒离开流体主流而撞击到滤材上，当流体改变运动方向时,惯性使颗粒撞击到滤材表面, 因吸附力的存在颗粒便停留在撞击表面。当流经过滤介质时流体必须沿弯曲通道行进.这将增加该过滤机理的有效性。

过滤介质的过滤/分离效率由于直接拦截  惯性撞击 扩散拦截的共同作用而增强。

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