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Chapter 9. FILTRATION Part III. Selected methods for improving filtration properties

Chapter 9. FILTRATION Part III. Selected methods for improving filtration properties. 9.1: Summary of selected methods for improving filtration properties : Filter density growth Filter thickness growth Defined fiber orientation Pleated filters Electrically charged filters

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Chapter 9. FILTRATION Part III. Selected methods for improving filtration properties

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  1. Chapter 9.FILTRATIONPart III.Selected methods for improving filtration properties

  2. 9.1: Summary of selected methods for improving filtration properties: • Filter density growth • Filter thickness growth • Defined fiber orientation • Pleated filters • Electrically charged filters • Fiber diameter, microfibers, nanofibers • Fiber shape

  3. 9.2 Filter density growth Filter density  (or packing fraction c) increases filter efficiency and pressure drop too. 9.2.1 Relation between packing fraction and filter efficiency: We can suppose relation between packing fraction c and these filtration mechanisms (see chapter 8.3 and 8.4): 1. Inertial impaction: Eir  - 1/(ln c)2(9.1) 2. Diffusional deposition: ED -1/(ln c)1/3(9.2) 3. Sieve effect: (9.3)

  4. 9.2.2 Relation between packing fraction and pressure drop According to cell theory of Kuwabara for cylindrical fibers oriented perpendicularly to flow we define:

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