Kev pom kev pom thiab qhov ntsuas particle loj ntawm cov pa luam yeeb hluav taws xob

Kev pom kev pom thiab qhov ntsuas particle loj ntawm cov pa luam yeeb hluav taws xob
Kab lus no tham txog qhov pom kev pom thiab qhov ntsuas particle loj ntawm cov pa luam yeeb hauv hluav taws xob. Visually, cov xim thiab clumping ntawm cov pa luam yeeb hluav taws xob cuam tshuam rau tus neeg siv qhov pom kev, thiab cov hauv paus ntsiab lus ntawm lub cev yog Rayleigh tawg thiab Mie tawg, feem. Qhov pom kev pom ntawm cov pa luam yeeb muaj feem xyuam rau qhov loj me ntawm aerosols, nrog cov khoom me me tshwm xiav thiab cov khoom loj dua tuaj yeem tshwm dawb. Cov txheej txheem tseem ceeb rau kev ntsuas particle loj muaj xws li laser particle size analyzer thiab scanning electron mobility particle size spectrometer, txhua tus muaj nws qhov zoo thiab qhov tsis zoo. Cov kws tshawb fawb tuaj yeem xaiv txoj kev sim tsim nyog raws li lawv xav tau. Qhov teeb meem tseem ceeb tam sim no ntsib los ntawm kev ntsuas hluav taws xob hluav taws xob aerosol yog qhov sib txawv me me, uas cuam tshuam nrog qhov nyuaj ntawm kev ntes cov khoom siv aerosol thiab tsis ruaj khov ntawm kev sim ib puag ncig.
Thaum cov neeg siv e-luam yeeb, lawv txhawj xeeb heev txog qhov "tsim pa luam yeeb", thiaj li ua tiav ob qho tib si pom kev txaus siab thiab kev txaus siab ntawm kev haus luam yeeb. Yog li dab tsi yog qhov txawv ntawm qhov muag pom thiab qhov tseeb "haus luam yeeb", thiab dab tsi yog cov txheej txheem tshawb fawb?
Thaum nws los txog rau qhov tseeb "qhov ntim haus luam yeeb", nws yuav tsum tau hais txog qhov ntsuas tseem ceeb - Total Particle Matter (TPM). Txoj kev kuaj pom dav dav rau TPM yog "txoj kev poob phaus", uas ntsuas qhov sib txawv ntawm cov khoom ua ntej thiab tom qab nqus raws li TPM tus nqi ntawm cov khoom siv. TPM yog cuam tshuam los ntawm kev ua haujlwm atomization ntawm lub cuab yeej, thiab cov kev cuam tshuam tshwj xeeb tuaj yeem pom hauv Kev Tshawb Fawb Txog Kev Ua Haujlwm ntawm Vapor hom Electronic Cigarettes. Nyob rau tib lub sijhawm, TPM muaj kev cuam tshuam loj rau qhov saj thaum nqus. Cov txheej txheem cuam tshuam tuaj yeem pom nyob rau hauv Aerosol seem ntawm Kev Tshawb Fawb Kev Haus Luam Yeeb (III): Aerosol Movement, Sedimentation Characteristics, thiab Sensory Experience.
Qhov teeb meem no feem ntau yog tham txog qhov pom kev pom thiab qhov ntsuas particle loj ntawm cov pa luam yeeb hluav taws xob.
Kev pom kev pom thiab qhov ntsuas qhov loj me ntawm cov pa luam yeeb hluav taws xob
(1) Aerosol pom kev pom
Ua ntej, peb yuav sau ob qhov pom kev sawv cev ntawm cov pa luam yeeb hluav taws xob. Ua ntej, thaum peb tshuab los yog maj mam nqus los ntawm hauv qab ntawm cov luam yeeb hauv qab, cov xim ntawm cov pa luam yeeb yuav yog lub teeb, txawm tias xiav, ua rau pom kev tsis zoo, raws li pom hauv daim duab 1; 2 yog cov pa luam yeeb uas tawm tom qab peb tau ua kom tiav nws, nrog cov clumping zoo dua thiab cov xim dawb yooj yim, muab kev pom kev zoo, raws li pom hauv daim duab 2. Yog li dab tsi yog vim li cas vim li cas cov pa taws sib txawv tshwm sim xiav lossis dawb?
Qhov ua rau cov pa luam yeeb xiav
Rayleigh scattering: Lub zog tawg yog inversely proportional rau plaub lub zog ntawm lub wavelength ntawm lub teeb, thiab qhov luv luv wavelength, lub zog tawg. Nyob rau hauv layman cov ntsiab lus, txoj kab uas hla ntawm hais yog npaum li cas me dua lub wavelength ntawm qhov teeb meem nthwv dej, nrog rau sab sauv khi ntawm txog 1/10 (1-300 nm) ntawm lub wavelength. Hauv cov nthwv dej luv luv, lub teeb xiav muaj lub zog siab tshaj plaws, yog li pom kev, cov pa luam yeeb yuav tshwm xiav. Qhov me me ntawm qhov me me, qhov pom tseeb dua cov xim xiav yuav yog.
2. Qhov ua rau cov pa luam yeeb dawb
Mie scattering: Scattering uas tshwm sim thaum txoj kab uas hla ntawm cov khoom nyob rau hauv cov huab cua sib npaug zos rau lub wavelength ntawm hluav taws xob, thiab qhov kev siv ntawm tawg yog proportional rau lub square ntawm zaus; Thaum cov particle loj loj dua qhov pom lub teeb wavelength ({{0}}}.38 ~ 0.78) μ m) Thaum lub zog tawg yog ywj siab ntawm lub wavelength, cov pa luam yeeb pom qhov muag dawb, thiab qhov loj dua qhov particle loj. , qhov pom tseeb ntawm cov xim dawb.
(2) Kev ntsuas particle loj ntawm hluav taws xob pa luam yeeb aerosol
Ob txoj kev ntsuas aerosol feem ntau yog sau thiab tshuaj xyuas, thiab cov ntawv nyeem ncaj qha. Tsis muaj qhov sib txawv nruj ntawm ob txoj hauv kev. Tus qub tuaj yeem ua tiav qhov kev ntsuas qhov ntsuas, qhov zoo thiab qhov ntsuas ntawm aerosols, tab sis nws yuav siv sij hawm ntev dua; Cov tom kawg tuaj yeem muab cov ntaub ntawv qhia txog qhov loj me me hauv lub sijhawm, tab sis nws kim dua.
Tam sim no, kev lag luam luam yeeb hauv hluav taws xob tau txais ob txoj kev ntsuas particle loj
1. Laser particle loj analyzer: siv lub hauv paus ntsiab lus ntawm lub teeb tawg los ntsuas particle loj thiab tis. Qhov ntsuas particle loj muaj ntau yam, tab sis vim muaj kev sib nrig sib cuam tshuam ntawm cov khoom, qhov tseeb yog me ntsis tsis zoo.
2-Scan electron mobility particle size spectrometer: Raws li txoj cai hais tias cov khoom sib txawv ntawm qhov sib txawv muaj peev xwm tsiv teb tsaws chaw sib txawv hauv qhov hluav taws xob, qhov ntsuas particle loj tau ua tiav nrog qhov ntsuas qhov tseeb, tab sis tsuas yog 1 tuaj yeem kuaj tau μ Ultrafine hais hauv qab no m.
Ob txoj kev ntsuas muaj lawv tus kheej qhov zoo thiab qhov tsis zoo, thiab cov kws tshawb fawb tuaj yeem xaiv raws li lawv tus kheej xav tau. Tam sim no, qhov teeb meem tseem ceeb ntawm kev ntsuas hluav taws xob pa luam yeeb aerosol tseem yog particle loj distortion. Ntawm ib sab, qee qhov tseem ceeb hauv aerosols yog qhov nyuaj rau kev ntes thiab sau, thiab ntawm qhov tod tes, ib puag ncig ntawm kev sim tsis tuaj yeem lav qhov ruaj khov ntawm aerosols, xws li txias condensation los ntawm qhov kub thiab txias thaum lub sij hawm thauj mus los, kev sib tsoo polymerization ntawm sib txawv particle, etc.