File:HEPA Filter diagram en.svg

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Summary

Description

English: Diagram showing the main parts of a HEPA filter on the large diagram; its operation is shown on the 3 smaller diagrams:

the thick brown/tan lines represent fibers in the filter medium.
the blue lines represent air flow.
The dark circle represents a particle (dust, bacteria, spore, etc.)
the dotted red line represents the trajectory of the particle; consider that as soon as a particle comes within one radius of a fibre it adheres to it.
in the case of diffusion, the particle (usually 0.1 µm or smaller) has such a trajectory because of the collision with gas molecules.

On the 100 nm to 1-micron scales that are the most challenging for filters, it is helpful to think of air as a viscous fluid like molasses. As the fluid flows through the filters, particles are carried around the fibers of the filter medium, for the most part. Inertial impaction: Larger particles (>1 micron) may be massive enough to continue to move in nearly a straight line (Newton's Law), as the flow is diverted around a fiber. Interception: Smaller particles are not much affected by inertia, but, if they are carried within one particle radius of the fiber, they will be intercepted by it. Diffusion: Still smaller particles (<100 nm) move randomly among streamlines as they are buffeted by collisions with molecules. A particle along a streamline that approaches a fiber very closely may be knocked against the fiber by such a collision.

English: This image was created as part of the Philip Greenspun illustration project.

Date

13 August 2008

Source

Did myself using this sources: [1], [2], [3], [4], [5], [6], [7], [8], [9].

Author

LadyofHats

Permission
(Reusing this file)

This work has been released into the public domain by its author, LadyofHats. This applies worldwide.

In some countries this may not be legally possible; if so:
LadyofHats grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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File history

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	Date/Time	Dimensions	User	Comment
current	18:41, 19 March 2019	607 × 544 (343 KB)	দিব্য দত্ত	Reverted to version as of 02:11, 25 February 2013 (UTC)
	18:40, 19 March 2019	607 × 544 (316 KB)	দিব্য দত্ত	Trying to remove a blue block near the word "প্ৰৱাহ"
	02:11, 25 February 2013	607 × 544 (343 KB)	Ysangkok	scour
	08:06, 1 September 2008	607 × 544 (395 KB)	LadyofHats	corrected particle size, aded average size of particles and trajectory on difuccion
	21:55, 15 August 2008	607 × 544 (384 KB)	LadyofHats	darker text
	21:17, 14 August 2008	607 × 544 (384 KB)	LadyofHats	this is a corrected version of the original
	21:16, 14 August 2008	607 × 544 (320 KB)	LadyofHats	THID VERSION CONTAINS LABELS AS TEXT!
	16:01, 13 August 2008	607 × 544 (382 KB)	LadyofHats	{{Information \|Description=diagram showing the main parts of a HEPA filter and the way it works. \|Source=Did myself using this sources: [http://people.seas.harvard.edu/~jones/lab_arch/nano_facilities/hepa.gif], [http://www.sage-earth-sciences.com/hepa/clo