为揭示冲洗水流经丙纶、涤纶集尘极表面浸入扩散过程的一般规律,解决传统湿式静电技术由集尘极材料选择及表面水膜布置不均引发的系列问题,利用高速摄像系统测量不同体积和性质的液滴在丙纶纤维织物（840A）和涤纶纤维织物（728）表面扩散面积和液滴高度随时间的变化关系,得到液滴浸入扩散动力学特性。结果表明：水液滴与840A的接触角θ为136.2°,与728的θ为52.5°,乙醇液滴与840A的θ为41.9°,与728的θ为46.5°;液滴扩散可分为扩散初期和后期两个阶段;水、乙醇液滴在728表面的扩散形状均为椭圆,扩散过程分别符合ExpAssoc、Hill分布;水、乙醇液滴在840A表面的扩散形状为圆和椭圆,乙醇液滴扩散过程符合Hill分布;织物表面纹理结构、液滴体积和性质、织物厚度、材料表面自由能对液滴扩散过程有明显影响。
Dynamics of drop spreading for water and ethanol absolute on polypropylene（840A） and terylene（728） was investigated using a CCD camera to deal with the problems caused by material and water distribution of wet electrostatic precipitator（ESP）.The results show that the contact angles for water on 728 and 840A were 52.5° and 136.2°,respectively,and the contact angles for ethanol absolute on 728 and 840A were 46.5° and 41.9°,respectively.It was observed that the overall duration of the spreading process can be divided into two stages,namely initial stage and later stage.The following rules of drop spreading for water and ethanol absolute on 728 were ExpAssoc and Hill,and the diffusion shapes were elliptical.The shapes for water and ethanol absolute on 840A were circular and elliptical,respectively.The following rule of drop spreading for ethanol absolute on 840A was Hill.The effects of several parameters on drop spreading were obvious,such as the assemblages into strands of fabrics,the properties and size of drop,the thickness of fabrics and the surface free energy of material.
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