Lub ntsej muag ntawm lub cev dub zoo meej (nrog rau qhov emissivity ntawm 1) emits thermal tawg ntawm tus nqi kwv yees li 448 watts ib square meter ntawm chav tsev kub (25 ° C, 298.15 K); Tag nrho cov khoom tiag tiag muaj emissivities tsawg dua 1.0, thiab emit hluav taws xob ntawm tus nqi qis dua.
Dab tsi yog qhov emissivity ntawm lub cev dub?
Emissivity txhais tau tias yog qhov sib piv ntawm lub zog hluav taws xob los ntawm qhov chaw ntawm cov khoom mus rau qhov uas tau tawg los ntawm lub emitter zoo meej, hu ua lub cev dub, ntawm qhov kub thiab qhov ntev. Ib tug dub muaj ib tug emissivity ntawm 1.
Tus nqi ntawm emissivity rau lub cev dub zoo meej yog dab tsi?
Cov hluav taws xob cua sov yog cov hluav taws xob infrared uas tuaj yeem suav nrog ob qho tib si pom hluav taws xob thiab hluav taws xob infrared. Quantitatively, emissivity yog qhov piv ntawm thermal hluav taws xob los ntawm ib qho chaw rau cov hluav taws xob ntawm qhov zoo tshaj plaws dub ntawm tib qhov kub. Emissivity ntawm lub cev dub zoo kawg nkaus yog 1.
Lub cev dub zoo li cas?
: lub cev zoo tshaj plaws lossis qhov chaw uas nqus tag nrho lub zog hluav taws xob poob rau ntawm nws yam tsis muaj kev xav thiab qhov ntawd radiates ntawm txhua zaus nrog lub zog spectral faib nyob ntawm nws qhov kub thiab txias.
Vim li cas lub emissivity ntawm lub cev dub sib npaug?
Cov hluav taws xob spectrum ntawm tus neeg tawv dub lub ntsej muag ua raws Planck txoj cai tag nrho, yog li nws cov emissivity monochromaticyog ib txwm 1. Tsis tas li ntawd, blackbody hluav taws xob faib nyob rau hauv txhua txoj kev yog ib yam, ua raws Lambert txoj cai kiag li.
