xov xwm

Refractory fiber ntauNyob rau hauv daim ntawv ntawm tshav kub hloov mus rau roughly muab faib mus rau hauv ob peb lub ntsiab, lub tshav kub hloov lwm lub tsev ntawm lub ntxeem tau silo, huab cua nyob rau hauv lub ntxeem tau silo tshav kub conduction thiab thermal conductivity ntawm cov khoom fiber ntau, qhov twg lub convective tshav kub hloov ntawm cov huab cua yog ignored. Bulk ntom thiab kub muaj kev sib raug zoo sib luag, qhov qis dua qhov kub thiab txias, qhov sib npaug ntawm hluav taws xob kev hloov cua sov nce ntxiv. Rau cov khoom siv fiber ntau refractory, qhov ntom ntom feem ntau yog qis dua 0.25g / cm ', qhov porosity yog siab dua 90%, cov roj theem tuaj yeem pom tau tias tsis tu ncua, cov theem khoom tuaj yeem pom tsis tu ncua, yog li cov khoom thermal conductivity ntawm fiber ntau kuj yog me me.
Yog hais tias tsuas yog los ntawm txoj kev xav tias qhov ntau ntom ntom me me, cov thermal conductivity loj, qhov ntau ntom yog loj thermal conductivity yog me me; Qhov no kuj tsis yog raws li qhov tseeb, xws li slag pob cov ntsiab lus sib txawv, txawm tias qhov sib txawv ntawm qhov sib txawv, cov fibers ntawm ib chav tsev ntim txawv, yog li qhov porosity ntawm ib chav tsev ntim tsis zoo ib yam, yog li yuav muaj qhov sib txawv ntawm thermal conductivity. Txawm li cas los xij, cov lus xaus zoo tuaj yeem sau tau raws li hauv qab no.
1. Lub thermal conductivity ntawmrefractory fiberstxo qis nrog qhov nce ntawm qhov ntom, thiab qhov txo qis zuj zus, tab sis thaum qhov ceev nce mus txog qee qhov ntau, cov thermal conductivity tsis txo qis dua thiab muaj lub siab xav kom maj mam nce.
2. Ntawm qhov kub sib txawv, muaj qhov tsawg kawg nkaus thermal conductivity thiab qhov sib xws tsawg kawg nkaus. Qhov ceev sib xws rau qhov tsawg kawg nkaus thermal conductivity nce nrog nce kub.
3. Rau tib qhov ntom ntom, cov thermal conductivity txawv nrog qhov loj ntawm qhov pores.
(1) Pore loj 0.1mm.
0C rau hauv = 0.0244W / (m. K) 100C thaum λ = 0.0314W / (m. K)
(2) Aperture 2 hli.
Hauv ntawm 0C = 0.0314W/(m, K) λ = 0. 0512W/(m . K) ntawm 100C. K)
Pore ​​txoj kab uas hla ntawm 1 hli, qhov kub nce ntawm 0C mus rau 500C, nws thermal conductivity nqi nce 5.3 npaug; pore txoj kab uas hla ntawm 5 hli, qhov kub nce ntawm 0C mus rau 500C, nws thermal conductivity nqi nce 11.7 npaug. Yog li ntawd, qhov loj dua qhov pores nyob rau hauv lub refractory fiber ntau, qhov me me ntawm cov khoom sib xws, thiab thermal conductivity nce.