Cov yam tseem ceeb uas txiav txim siab qhov tsis kam ntawm siab -cov lim cua ua tau zoo tuaj yeem nkag siab tias yog qhov txiaj ntsig zoo ntawm kev sib cuam tshuam ntawm cov tshuab ua kua thiab cov ntaub ntawv tshawb fawb. Resistance tseem ceeb yog hais txog lub zog poob los ntawm kev sib txhuam nrog cov khoom lim, channel contraction/expansion, thiab local eddies thaum airflow dhau los ntawm lub lim.
Los ntawm kev pom kev, plaub yam tseem ceeb hauv qab no sib sau ua ke txiav txim siab qhov loj ntawm qhov tsis kam:
1. Inherent zog ntawm cov khoom lim: cov "gene" tsis kam, cov khoom siv lim nws tus kheej yog qhov chaw tseem ceeb rau kev tsim cov khoom tiv thaiv, thiab nws cov microstructure ncaj qha txiav txim siab qhov yooj yim tsis kam.
- Fiber diameter: Qhov no yog ib qho tseem ceeb tshaj plaws. Raws li cov hauv paus ntsiab lus ntawm cov dej mechanics, kev tiv thaiv yog inversely proportional rau lub square ntawm fiber inch. Qhov zoo dua ntawm cov fiber ntau, qhov loj dua qhov kev sib txhuam ntawm qhov chaw thiab kev ua haujlwm thaum cov cua ntws dhau ntawm cov fiber ntau. Piv txwv li, lim cov ntaub ntawv uas ua los ntawm ultrafine iav fibers (inch 0.5-2 μ m) muaj ntau dua resistant dua li cov hluavtaws fibers (inch 10-20 μ m).
- Sau tus nqi thiab porosity: Sau tus nqi yog hais txog qhov feem ntawm fibers ib chav tsev ntim, thaum porosity hais txog qhov feem ntawm cov voids. Qhov siab dua tus nqi sau thiab qis dua qhov porosity, qhov nruj dua cov txheej txheem fiber ntau, qhov nqaim thiab ntau tortuous lub airflow channel, thiab qhov ua rau muaj zog ntxiv.
- Lim cov khoom tuab: Cov tuab tuab, ntau txheej txheej ntawm cov fibers yuav tsum tau hla dhau, txoj kev ntev dua, thiab ntau lub sijhawm rau kev sib tsoo thiab kev sib txhuam nrog cov fibers, uas ua rau muaj zog tiv thaiv.
- Kev kho deg: Qee yam kev kho mob tshwj xeeb (xws li oleophobic thiab hydrophobic coatings, antibacterial coatings) tuaj yeem thaiv qee qhov pores lossis hloov cov khoom fiber ntau, yog li ua rau muaj kev tiv thaiv rau airflow.
2. Kev tsim qauv ntawm lub cev: "lub cev pob txha" ntawm kev ua haujlwm, tom qab txiav txim siab cov khoom siv lim, yuav ua li cas sib sau cov khoom lim rau hauv lub lim dej muaj kev txiav txim siab ntawm kev ua haujlwm.
- Lim cheeb tsam: Qhov no yog qhov hloov pauv muaj txiaj ntsig tshaj plaws hauv kev siv tswv yim. Kuj yog inversely proportional rau pom cheeb tsam. Thaum qhov ntsuas huab cua nyob tas li, qhov loj dua qhov chaw nthuav dav ntawm daim ntawv lim, qhov qis dua qhov pom tseeb tshaj tawm (filtration rate) ntawm cov cua ntws dhau los ntawm cov khoom siv lim. Raws li Darcy txoj cai, kev tiv thaiv yog ncaj qha proportional rau pom tus nqi, yog li ua kom pom cov cheeb tsam yog qhov ncaj qha thiab zoo tshaj plaws los txo qhov tsis kam.
- Piv txwv li: Nyob rau hauv tib lub ntim huab cua, ib lub lim nrog ib daim ntawv lim cheeb tsam ntawm 20m ² yuav tsuas muaj ib nrab ntawm cov tsis kam ntawm lub lim nrog ib tug lim ntawv cheeb tsam ntawm 10m ². *
- Layer Parameters (pleat qhov siab thiab pleat spacing):
- Pom zoo thaj chaw: Los ntawm kev ua kom zoo ntawm qhov siab thiab qhov sib txawv, ntau cov ntawv lim tuaj yeem thauj mus rau hauv qhov ntim tsawg.
- Airflow channel zoo: Ib qho haum pleat spacing tuaj yeem ua kom cov kab ntawm cov ntawv lim tsis muaj kev cuam tshuam. Lub pleat spacing yog nqaim dhau lawm, thiab qhov nrawm ntawm cov cua ntws hloov pauv sai heev tom qab nkag mus rau hauv cov channel, ua rau "txhaj tshuaj" uas tsis yog tsuas yog ua rau muaj kev tiv thaiv tab sis kuj cuam tshuam rau cov ntawv lim; Yog hais tias lub pleat spacing yog dav heev, nws yuav nkim qhov chaw, ua rau muaj kev nce hauv pom tus nqi thiab tsis kam. Muaj feem ntau yog qhov pom kev zoo sib piv uas txo qis qhov kev poob siab ntawm cov cua ntws thaum nkag mus rau hauv pleats.
- Kev them nyiaj yug sab hauv thiab muab faib:
- Kev faib tawm lim: Lub thickness thiab nto smoothness ntawm cov phaj muab faib (txhuas ntawv / ntawv) cuam tshuam rau qhov dav thiab kev sib txhuam tsis kam ntawm airflow channel. Smooth ripples lossis tuab tuab tuaj yeem ua rau muaj zog hauv zos.
- Tsis muaj kev faib lim: Cov duab, qhov siab, thiab qhov sib nrug ntawm cov kab kub yaj nplaum txiav txim siab cov kab ntawm cov ntawv lim. Yog hais tias cov kua nplaum kab yog siab dhau los yog tsis sib xws, nws yuav nyob ntau dhau ntawm cov cua ntws thiab ua kom muaj zog.
3. Aerodynamic yam: Cov "ib puag ncig" ntawm kev tiv thaiv, thiab cov huab cua nyob ib puag ncig lub xeev ntawm lub lim kuj pab txhawb rau qee qhov kev tiv thaiv thaum lub sijhawm ua haujlwm.
- Facing cua ceev: Kev tiv thaiv thiab cua ceev tsis yog tag nrho linearly ntsig txog. Ntawm qhov ceev ceev (cov kev khiav hauj lwm ib txwm ntawm high -cov lim dej), kev sib txhuam tsis zoo yog qhov tseem ceeb, mus txog linearity; Tab sis nyob rau hauv cov cheeb tsam siab - ceev, yuav luag (eddy tam sim no poob), uas yuav ua rau kom txoj kev loj hlob ntawm kev tiv thaiv.
- Uniformity ntawm airflow faib: Yog hais tias lub airflow yog unevenly faib nyob rau saum npoo ntawm lub lim (piv txwv li, cua kub ceev nyob rau hauv lub direct blowing cheeb tsam ntawm tus kiv cua thiab tsis tshua muaj cua ceev ntawm ntug), lub zos kub ceev cov cheeb tsam yuav tsim ntau dua qhov nruab nrab tsis kam, thiab qhov no ntxiv zog poob yuav ua rau kom tag nrho cov tsis kam ntawm tag nrho cov lim.
- Inlet thiab qhov hluav taws xob tej yam kev mob: Lub smoothness ntawm airflow channels upstream thiab downstream ntawm lub lim kuj muaj feem xyuam rau cov kuj. Piv txwv li, yog tias lub lim yog nruj nreem txuas rau lub luj tshib los yog qhov sib txawv ntawm txoj kab uas hla, cov cua tsis sib xws tuaj yeem ua rau cov vortex poob ntxiv thaum nkag mus rau hauv lub lim.
4. Kev khiav hauj lwm raws li txoj cai: "dynamic evolution" tsis kam, uas tsis yog tus nqi zoo li qub thiab yuav hloov raws sijhawm.
- Dust accumululation load: Raws li cov plua plav accumulates nyob rau saum npoo ntawm fibers, tsim ib txheej plua plav, cov cua ntws channel ua ntxiv nqaim lossis txawm thaiv, thiab qhov kev tiv thaiv maj mam nce. Qhov no yog cov txheej txheem los ntawm thawj qhov kev tawm tsam mus rau qhov kawg tsis kam.
- Cov yam ntxwv ntawm cov roj: Cov viscosity ntawm cov roj sib txawv nrog qhov kub thiab txias. Qhov kub thiab txias, qhov ntau dua qhov viscosity ntawm cov roj, qhov kev sib tw molecular ntau dua, thiab kev sib tsoo thiab kev sib txhuam nrog cov fibers intensified, ua rau muaj zog tiv thaiv; Pressure decreases, gas density decreases, friction loss decreases, and resistance decreases.
- Cov ntsiab lus: Cov txheej txheem kev ua haujlwm uas txiav txim siab qhov tsis kam ntawm siab - cov lim dej ua tau zoo tuaj yeem raug sau tseg raws li hauv qab no:
- 1. Cov hauv paus ntsiab lus: lub fiber ntau txoj kab uas hla thiab filling tus nqi ntawm cov khoom lim txiav txim qhov yooj yim microscopic frictional tsis kam.
- 2. Tsim tus yuam sij: Qhov chaw lim dej zoo yog lub zog loj rau kev kho qhov tsis kam, thiab qhov loj ntawm thaj chaw, qhov qis dua qhov tsis kam.
- 3. Cov ntsiab lus ntawm cov qauv: Cov yam ntxwv ntawm cov pleats thiab cov khoom sib cais txiav txim siab qhov poob ntawm cov cua ntws hauv macroscopic channel.
- 4. Kev hloov pauv ua haujlwm: Cua ceev kev faib tawm thiab plua plav pov tseg qib cuam tshuam rau qhov tiag -lub sijhawm tus nqi ntawm kev tiv thaiv.
- Kev nkag siab txog cov xwm txheej no tuaj yeem pab sib npaug ntawm kev ua haujlwm thiab kev tiv thaiv thaum xaiv: nws yog ib qho tsim nyog yuav tsum tau txuag lub zog ntawm kev ua haujlwm qis, ua kom lub neej kev pab cuam ntawm cov plua plav muaj peev xwm tuav tau siab, thiab ua kom pom kev ua tau zoo raws li kev huv huv.
