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Particle Deposition on a Loaded Fiber Problem Presentation
2/11/99

Particle Deposition on a Loaded Fiber Problem Presentation

Outline

Donaldson Company, Inc. http://www.donaldson.com/

Air filtration industry

Particles suspended in air

Particles suspended in air

Particles suspended in air

Particles suspended in air

Particle Sizes (the most important physical parameter)

PPT Slide

PPT Slide

Filter Systems, Gas Turbine Application

Disk Drive Filters

Filter Media (Fibers randomly distributed in a plane normal to flow direction)

Basic Filtration Mechanisms

Filter Efficiency

Performance parameters for a filter media

Problem Definition: To Predict Efficiency and Pressure Drop of a Filter with Polydisperse Fibers.

Problem Definition: To Predict Efficiency and Pressure Drop of a Filter with Monodisperse Fibers.

Problem Definition: To Obtain Flow Field and the Pressure Drop of a Fibrous Filter ( 3-D ).

Problem Simplification I: To Obtain 2-D Flow Field, Assuming Fibers Are Parallel to Each Other.

Problem Simplification II: To Obtain 2-D Flow Field in a Periodic Staggered Array of Fibers.

Problem Simplification II (Continued)

Problem Simplification III: Assuming the Outer Boundary Is a Circle of Same Area and Boundary Condition Is Zero Vorticity (Kuwabara, 1959).

Problem Simplification III (Continued)

Dendrite structure, particle deposition in a filter

Modeling of filter performance

Some thoughts on the dendrite structure

Numerical Approach, Monte-Carlo Simulation (e.g. Kanaoka et al. 1983)

Problem Workshop on Math Problems in Industry ‘98 Rensselaer Polytechnic Institute

Particle deposition on a clean fiber due to Interception

Particle deposition on a loaded fiber due to Interception (Kanaoka et al. 1986)

Why “bunny ear”?

A 2D Continuous Approach Workshop on Math Problems in Industry ‘98 Rensselaer Polytechnic Institute

A 2D Continuous Approach (Continued)

Various other assumptions used Workshop on Math Problems in Industry ‘98 Rensselaer Polytechnic Institute

Summary

Author: Ming Ouyang
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