Chp 1 -Particle Size Analysis

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1、Week#1MRChMRChapter1•Tutorial#1MARTINRHODES(2008)•MR#1.1,1.4,1.7.IntroductiontoParticleTechnology,2ndEdition.•TobediscussedonJan.18,PublisherJohnWiley&Son,2012.Chichester,WestSussex,Chichester,WestSussex,•ByeithervolunteerorEngland.classlist.•DescribingthesizeofaDescribingthesizeofasinglepa

2、rticle.Someterminolgyaboutdiametersusedindiametersusedinmicroscopy.•Equivalentcirclediameter.•Martin’sdiameter.•Feret’sdiameter.•Sheardiameter.Describingggthesizeofasinglepparticle•Regular-shapedparticles•Theorientationoftheparticleonthemicroscopeslidewillaffecttheprojtdijectedimageanddcons

3、equentltlthythemeasuredequivalentspherediameter.•Sievemeasurement:Diameterofaspherepassingthroughthesamesievespherepassingthroughthesamesieveaperture.Comparisonofequivalentspherediameters.•Sedimentationmeasurement:Diameterofaspherehavingthesamesedimentationvelocityunderthesameconditions.Com

4、parisonofequivalentdiameters•Thevolumeequivalentspherediameterisacommonlyusedequivalentspherediameter.•Examppple:Coultercountersizemeasurement.Thediameterofaspherehavingthesamevolumeastheparticle.•Surface-volumediameteristhediameterofaspherehavingthesamesurftlfacetovolumeratititoasthhtepart

5、iiclle.(Exampll)e)ShapeCuboidCylinderCuboid:sidelengg,thsof1,3,,5.Cylinder:diameter3andlength1.Descriptionofpopulationsofparticles•TypicaldifferentialfrequencydistributiondFfx()F:Cumulativedistribution,fx()iitntegrallfthfofthefrequencydiditibtistribution.dx•Typicalcumulativefrequencydistri

6、bution•Foragivenpopulationofparticles,thedistributionsbymass,numberandsurfacecandifferdramatically.•Allaresmoothcontinuouscurves.•Sizemeasurementmethodsoftendividethesizespectrumintosizerangesandsizedistributionbecomesranges,andsizedistributionbecomesahistogram.•CibComparisonbettdweendiistt

7、ribibutitionsConversionbetweendistributions•Massandnumberdistributionsforman-madeobjectsorbitingtheearth•Totalnumberofparticles,NandtotalsurfaceareaSareconstant.•ParticleshapeisParticleshapeisindependentofsize,isconstant.sVisthetotalvolumeoftheVisthetot