Aerosol Technology: Properties, Behavior, and Measurement of by William C. Hinds

By William C. Hinds

New version of the textual content introducing the fundamentals of the sphere, together with smooth thought and functions. Chapters hide such themes as homes of gases, bioaerosols, uniform particle movement, Brownian movement and diffusion, breathing deposition versions, and sampling and size of focus. applicable for pros, graduate scholars, and complex undergraduates. makes use of twin devices, with SI devices basic and cgs devices secondary.

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Additional info for Aerosol Technology: Properties, Behavior, and Measurement of Airborne Particles

Sample text

Vincent, J. ) Vincent, J. Ln°f' PU1! :Js jOSOJ:J1! O} p:J}OA:Jp :JJ1! w:J}U! A01 PU1! Becauseof this wide size rangeand the fact that the physicalpropertiesof aerosolsare strongly dependenton particle size, it is necessaryto characterizethesesize distributionsby. For the purposesof this chapter,we neglectthe effect of particle shapeand consideronly sphericalparticles. Later we apply theseconceptsto the most common aerosolsize distribution, the lognormal distribution. In somesituations,keepingthe datain this form may be desirable--for example,if the list is stored in a computer.

U:)q PU1! s 1! S! l1! :)q~ S! q S! A 1! 0. :)J~ JO 1! S! ld:)JS! 9 Cumulative distribution curve (logarithmic size scale). For the massdistribution, we replacethe geometricmean diameterwith the massmedian diameterMMD, analogousto what we did for the count distribution. The massdistribution hasthe sameshapeasthe count distribution but is displacedalongthe size axis by a constantamountequalto MMD/CMD. The ratio MMD/CMD can be calculated knowing only the GSD. 6. 10 Count and massdistributions (logarithmic size scale).

Ds o~ put! 's~Jods put! Iddt! J~~WWAS'~SJno:) JO 'S! I ~t! :J~uoO p~A\~){S t! J S! qs p~A\~){S put! :)S IOSOJ~t! U! Iddt! I pug put! :)~ds o~ AIddt! pu~ddt! ~q~ U! ~ ~J1! ~Jq)I put! SO~ ~q~ st! Iddt! ns ~ou S! A\ q~noq~It! ut! put! d AUt! J~U~~ U! LSIO '1VMIONDO'I mJ. 8 Frequencydistribution curve (logarithmic size scale). 1. Note that the logarithmic scale has no negativevalues, thus overcomingthe problem of negativeparticle size. )Mixtures of lognormal distributions will not be lognormal. The lognormal distribution is most useful in situations where the distributed quantity can have only positive valuesand coversa wide rangeof values-that is, where the ratio of the largestto the smallestvalue is greaterthan about 10.

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