Emissivity yog khoom siv kho qhov muag ntawm cov khoom siv, uas piav qhia ntau npaum li cas lub teeb yog radiated (emitted) los ntawm cov khoom uas cuam tshuam rau tus nqi uas radiates lub cev dub ntawm tib qhov kub. Lub cev dub yog lub cev zoo tagnrho uas nqus tag nrho cov hluav taws xob. … Lub cev dub yog lub cev zoo tshaj plaws uas nqus tau tag nrho cov hluav taws xob.
Dab tsi yog emissivity ntawm cov khoom?
Emissivity txhais tau tias yog qhov piv ntawm lub zog hluav taws xob los ntawm cov khoom siv saum npoo mus rau qhov hluav taws xob los ntawm cov emitter zoo meej, lub npe hu ua lub cev dub, ntawm tib qhov kub thiab qhov nthwv dej thiab hauv qab. tib yam kev pom. Nws yog ib tug dimensionless tooj ntawm 0 (rau ib tug zoo meej reflector) thiab 1 (rau ib tug zoo meej emitter).
Koj pom qhov emissivity ntawm cov khoom li cas?
Qhov emissivity tuaj yeem txiav txim siab los ntawm ib qho ntawm cov hauv qab no, raws li kev nyiam: Txiav txim siab qhov ntsuas kub ntawm cov khoom sivib lub sensor xws li RTD, thermocouple lossis lwm yam txoj kev tsim nyog. Tom ntej no, ntsuas cov khoom kub thiab kho qhov chaw emissivity kom txog thaum tus nqi raug.
Qhov txawv ntawm emissivity thiab absorptivity yog dab tsi?
Absorptivity (α) yog ib qho kev ntsuas ntawm ntau npaum li cas ntawm cov hluav taws xob absorbed los ntawm lub cev. Reflectivity (ρ) yog ib qho kev ntsuas ntawm ntau npaum li cas yog reflected, thiab transmissivity (τ) yog ib qho kev ntsuas ntawm ntau npaum li cas kis los ntawm cov khoom. … Emissivity (ε) yog ib qho kev ntsuas ntawm yuav ua li cas much thermalhluav taws xob lub cev tawm mus rau nws ib puag ncig.
YPuas yog lub nqus hluav taws xob zoo ntawm cov hluav taws xob zoo?
Ib yam khoom uas zoo ntawm nqus hluav taws xob kuj yog ib qho zoo emitter, yog li lub cev dub zoo meej yuav yog qhov zoo tshaj plaws ntawm hluav taws xob hluav taws xob. Tsis muaj cov khoom paub uas zoo tshaj plaws ntawm absorbing lossis emitting tag nrho cov hluav taws xob ntawm txhua zaus uas yuav raug coj mus rau nws.
