ME405_Lecture_37 - : Example Given : The particle...

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ME 405 Fall 2006 Professor John M. Cimbala Lecture 37 12/04/2006 Today, we will : Continue to discuss particle collection efficiency in Section 8.3 Do an example – the sample data from our class handout going though an air cleaner Discuss air cleaners in series and parallel in Section 8.3 Do some example problems – air cleaners in series and parallel If time, begin to discuss equations of particle motion in Section 8.4 Grade efficiency (also called fractional efficiency) of various air cleaners: Figure 8.7 Typical collection grade efficiencies of different dust collectors; A: low-efficiency high-flow rate cyclones, B: high-efficiency low-flow rate cyclones, C: spray towers, D: electrostatic precipitators, E: venturi scrubbers. Summary of Important Equations and Concepts for Particle Collection
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Unformatted text preview: : Example Given : The particle distribution from the class handout passes through an air cleaner with grade efficiency η ( D p ) = 1 – exp(–0.0068 D p 2 ). To do : Compare the mass distribution into and out of the air cleaner. Plot the inlet and outlet cumulative mass distributions on log probability paper and compare. Solution : See the Excel spreadsheet on the course website. Log probability plots: sample data of the class handout (before and after air cleaner) cumulative distribution function, expressed as a probability (%) D p,max,j ( μ m) 1 2 3 4 5 8 6 10 20 30 40 50 80 60 100 10 5 2 20 15.9 30 50 40 50 70 60 80 90 95 98 84.1 Original number distribution Inlet mass distribution (before cleaner) Outlet mass distribution (after cleaner)...
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This note was uploaded on 07/23/2008 for the course ME 521 taught by Professor Cimbala during the Fall '07 term at Pennsylvania State University, University Park.

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ME405_Lecture_37 - : Example Given : The particle...

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