• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Research on air filtration: 1. Performance of filters with noncircular fibers. 2. Characteristics of industrial filter media.
【24h】

Research on air filtration: 1. Performance of filters with noncircular fibers. 2. Characteristics of industrial filter media.

机译：空气过滤的研究：1.非圆形纤维过滤器的性能。 2.工业过滤介质的特征。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Happel-Kuwabara cell model, which was used exclusively for circular fibers, has been extended to fibers of an arbitrary cross-sectional shape. By forcing the truncated general solution of biharmonic equation ;The above method has been applied to rectangular fibers. Simple analytical formula for dimensionless drag at zeroth order approximation is derived. In cases where zeroth order approximation does not provide satisfactory accuracy, higher orders of approximations are used. Comparison with previous numerical results shows good agreement. In addition, filter efficiency due to interception for rectangular fibers and dimensionless drag for "+" shaped fibers are calculated.;The solution method has also been applied to a staggered array of fibers where the outer boundary is noncircular. It is found that Happel-Kuwabara cell model can be considered as a zeroth order approximation of the truncated solution, and the error at the outer boundary is not minimized unless the cell radius and the undisturbed velocity take different values.;To test filters for high efficiency and general purpose cleaning, an automated filter test system has been built for measuring the filter efficiency and pressure drop. The possible errors and uncertainties in filter efficiency measurement are minimized. Pressure drop and particle penetration data for seven industrial filter media have been obtained.;As a criterion to compare different filters, figure of merit has been studied qualitatively. Using two dimensional filtration theories, the figure of merit is shown to have a minimum at certain fiber diameter, and fibers larger or smaller would provide better performance. It is found that from both theory and experiment, the roles of good filter and bad filter may change when operating condition changes, and filters made of fine fibers does not always outperform those made of coarse ones.
机译：专门用于圆形纤维的Happel-Kuwabara单元模型已扩展到任意横截面形状的纤维。通过强迫双调和方程的截断一般解；上述方法已应用于矩形纤维。推导了零阶近似无量纲阻力的简单解析公式。在零阶近似不能提供令人满意的精度的情况下，可以使用更高阶的近似。与先前的数值结果进行比较显示出很好的一致性。此外，还计算了由于矩形纤维的截留和“ +”形纤维的无量纲阻力而导致的过滤效率。求解方法也已应用于外部边界为非圆形的交错纤维阵列。发现Happel-Kuwabara单元模型可以看作是截断解的零阶近似，并且除非单元格半径和原状速度取不同的值，否则外边界的误差不会最小化。为了提高效率和进行通用清洁，已建立了用于测量过滤器效率和压降的自动过滤器测试系统。滤波器效率测量中可能出现的误差和不确定性降至最低。获得了七个工业过滤介质的压降和颗粒渗透数据。;作为比较不同过滤器的标准，定性研究了品质因数。使用二维过滤理论，在一定的纤维直径下，品质因数显示为最小值，而较大或较小的纤维将提供更好的性能。从理论和实验都发现，当工作条件改变时，良好过滤器和不良过滤器的作用可能会改变，并且由细纤维制成的过滤器并不总是优于由粗纤维制成的过滤器。

著录项

  • 作者

    Ouyang, Ming.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 145 p.
  • 总页数 145
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号