Small-Scale Turbulent Diffusion in the Atmosphere

Clarenburg, L.A.; Tang, Chongjian

doi:10.1038/187586a0

Cited by 3 publications

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“…Clarenburg and coworkers (Clarenburg and Werner 1965;Clarenburg and Wal 1966;Clarenburg and Piekaar 1968;Clarenburg and Schierech 1968) studied the structure effect of lter properties on the lter performance. Several different lters with varying distributions of ber diameters were used in the work.…”

Section: Derivation Of the Equivalent Ber Diametermentioning

confidence: 99%

An Asymmetrical, Three-Dimensional Model for Fibrous Filters

Dhaniyala¹

1999

Aerosol Science and Technology

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ABSTRACT. The ow in a lter media represented by a three-dimensional ber arrangement has been modeled using a nite volume approach. This results in a better estimate of ber drag and accounts for some of the difference between theory and experimental results. In addition, the effect of inter ber distance and packing density distribution on drag characteristics is obtained numerically. An equivalent ber diameter based on the numerically obtained ber drag is compared with experimental values. The excellent agreement of numerical results with experimental values reveals the advantage of considering these media properties in modeling lter behavior. INTRODUCTIONThe important parameters in evaluating a lter media are pressure drop and particle collection ef ciency, and these parameters are dependent on the operating conditions and media properties such as ber size and packing density. Theoretical and numerical modeling of ow through the media is required to predict lter performance and enable design optimization. The lter media is represented by a simple structure, and the ow eld in this structure is used in calculating the lter characteristics. The accurate estimation of media performance requires an ideal representation of the real lter structure.The ow in a lter is generally in the low Reynolds number regime and follows Darcy's law (Davies 1973) with a linear dependence of pressure drop on face velocity. This is represented as:

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Section: Derivation Of the Equivalent Ber Diametermentioning

confidence: 99%