Convection vs Radiation
Convection thiab hluav taws xob yog ob txoj kev sib tham ntawm tshav kub. Convection yog txoj kev hloov cov cua sov siv cov khoom txav. Radiation tsis xav tau cov khoom los yog qhov nruab nrab los hloov lub zog. Ob qhov txheej txheem no tseem ceeb heev hauv ntau qhov chaw. Cov ntsiab lus no tau siv dav hauv tshav kub thiab thermodynamics, atmospheric science, huab cua tsom, kev tsom xam huab cua, dej mechanics thiab txawm tias kev kho mob sciences. Nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo hauv cov ntsiab lus no kom ua tau zoo hauv cov haujlwm no, uas muaj kev siv hnyav ntawm cov ntsiab lus no. Nyob rau hauv tsab xov xwm no, peb yuav tham txog dab tsi convection thiab hluav taws xob yog, lawv cov ntsiab lus, kev siv ntawm convection thiab hluav taws xob, lawv qhov zoo sib xws thiab thaum kawg qhov txawv ntawm convection thiab hluav taws xob.
Radiation yog dab tsi?
hluav taws xob hluav taws xob lossis feem ntau hu ua hluav taws xob lossis EM hluav taws xob yog ib txoj hauv kev hloov hluav taws xob. Electromagnetic hluav taws xob yog thawj zaug los ntawm James Clerk Maxwell. Qhov no tom qab tau lees paub los ntawm Heinrich Hertz uas ua tiav thawj EM nthwv dej. Maxwell tau muab daim ntawv nthwv dej rau hluav taws xob thiab sib nqus nthwv dej thiab ua tiav qhov kev ntsuas ceev ntawm cov nthwv dej no. Txij li thaum lub nthwv dej no sib npaug rau qhov kev sim ntawm qhov ceev ntawm lub teeb, Maxwell kuj tau hais tias lub teeb yog, qhov tseeb, ib daim ntawv ntawm EM nthwv dej. Electromagnetic nthwv dej muaj ob qho tib si hluav taws xob thiab ib qho chaw sib nqus oscillating perpendicular rau ib leeg thiab perpendicular rau cov kev taw qhia ntawm yoj propagation. Txhua qhov hluav taws xob hluav taws xob muaj tib qhov kev tshaj tawm hauv lub tshuab nqus tsev. Qhov zaus ntawm electromagnetic yoj txiav txim siab lub zog khaws cia hauv nws. Tom qab ntawd nws tau pom tias siv quantum mechanics tias cov nthwv dej no yog, qhov tseeb, pob ntawv ntawm nthwv dej. Lub zog ntawm pob ntawv no nyob ntawm qhov zaus ntawm nthwv dej. Qhov no qhib lub teb ntawm nthwv dej - particle duality ntawm teeb meem. Tam sim no nws tuaj yeem pom tias hluav taws xob hluav taws xob tuaj yeem suav tias yog nthwv dej thiab hais. Ib yam khoom, uas tau muab tso rau hauv qhov kub thiab txias tshaj qhov xoom xoom, yuav tawm EM nthwv dej ntawm txhua lub wavelength. Lub zog, uas qhov siab tshaj plaws ntawm photons tawm, nyob ntawm qhov kub ntawm lub cev.
Convection yog dab tsi?
Convection yog cov lus siv rau kev txav ntawm cov kua dej ntau. Txawm li cas los, nyob rau hauv no tsab xov xwm, convection yog coj mus rau hauv daim ntawv ntawm tshav kub convection. Tsis zoo li conduction, convection tsis tuaj yeem tshwm sim hauv cov khoom. Convection yog cov txheej txheem ntawm kev hloov hluav taws xob los ntawm kev hloov khoom ncaj qha. Nyob rau hauv cov kua thiab gasses, thaum rhuab los ntawm lub hauv qab, lub hauv qab txheej ntawm cov kua yuav rhuab ua ntej. Cov cua sov txheej ces nthuav; ua kom tsawg dua cov cua txias, cov cua kub txheej nce nyob rau hauv daim ntawv ntawm convection tam sim no. Tom qab ntawd cov kua dej tom ntej no tau ntsib tib yam tshwm sim. Lub caij no, thawj txheej huab cua kub yog tam sim no txias, thiab nws yuav los. Cov nyhuv no tsim ib lub voj voog conduction, tsis tu ncua tso cov cua sov los ntawm cov khaubncaws sab nraud povtseg mus rau cov khaubncaws sab nraud povtseg. Qhov no yog ib qho qauv tseem ceeb heev hauv huab cua. Cov cua kub ntawm lub ntiaj teb no tso tawm rau saum huab cua nyob rau hauv no mechanism.
Qhov txawv ntawm Convection thiab Radiation yog dab tsi?
• Rau convection tshwm sim, ib qho nruab nrab nrog cov khoom txav tau yuav tsum muaj nyob ib ncig ntawm lub cev. Radiation tsis xav tau qhov nruab nrab.
• Lub tshav kub hloov ntawm hluav taws xob yog sai dua li cov cua kub hloov ntawm convection.
• Convection ib txwm nqa cov cua sov tawm ntawm lub ntiajteb txawj nqus, qhov hluav taws xob tawm hauv txhua qhov kev taw qhia.
