关于纤维滤料对数穿透率表达式的探讨  

Investigation of Logarithmic Penetration Expressions for Fibrous Media

作　　者：周斌[1] 张小松[1] 

机构地区：[1]东南大学能源与环境学院

出　　处：《建筑热能通风空调》2011年第1期63-65,共3页Building Energy & Environment

基　　金：国家科技支撑重点资助项目(No.2008BAJ12B02)

摘　　要：本文从理论上比较了纤维滤料对数穿透定律的两种表达式,研究发现模型中来流速度的选择是产生这两种表达式的根本原因。针对常见的纤维滤料填充率和直径特性,探讨了滤料穿透率的联合影响因素:①填充率和单纤维效率;②填充率和纤维直径;③填充率和滤料厚度,结果表明填充率对穿透率的影响大小与单纤维效率、纤维直径以及滤料厚度有关。Hinds教授表达式得到的穿透率比许钟麟教授的大。纤维直径和厚度一定时,填充率增加,计算得到的穿透率之间相对误差增大。单纤维效率和纤维厚度一定,当纤维直径变小,填充率对穿透率的影响变得显著。纤维直径和单纤维效率一定时,滤料越厚,填充率对穿透率的影响越大。Two logarithmic penetration expressions of fibrous media were compared theoretically. It is shown that selection of inlet velocity results in these two expressions. Given the common characteristics of solid fraction and diameter, the combined effects on media penetration were investigated： （1） solid fraction and single fiber efficiency; （2） solid fraction and fiber diameter; （3） solid fraction and media thickness. The influence of solid fraction on penetration is affected by single fiber efficiency, fiber diameter and media thickness. Penetration from Hinds＇ expression is larger than that from Xu with the same condition. With the same fiber diameter and media thickness, the relative error from these equations becomes larger with increased solid fraction. Given the same single fiber efficiency and media thickness, the smaller the fiber diameter is, the more obvious influence of the solid fraction on penetration will be. When the fiber diameter and single fiber efficiency are invariants, the thicker the media is, the greater the influence of solid fraction on penetration will be.

关 键 词：纤维过滤器 固体气溶胶 对数穿透定律 

分 类 号：TU831[建筑科学—供热、供燃气、通风及空调工程]