Qhov sib txawv tseem ceeb ntawm sublimation thiab hloov hluav taws xob yog qhov sublimation yog qhov hloov pauv hauv lub xeev qhov teeb meem whereas heat transfer is a change in the state of energy.
Sublimation thiab cua sov hloov pauv yog ob lub ntsiab lus uas peb tham hauv qab lub zog thiab lub xeev teeb meem. Cov ntsiab lus no tseem ceeb heev hauv kev kawm txog cov haujlwm xws li thermodynamics, teeb meem kev hloov pauv, tsim hluav taws xob, thiab hloov hluav taws xob, thiab yuav luag txhua qhov kev siv tshuab. Yog li, kev nkag siab meej ntawm cov ntsiab lus no yog qhov tseem ceeb kom ua tau zoo hauv cov haujlwm saum toj no.
Sublimation yog dab tsi?
Sublimation yog tus txheej txheem ntawm kev hloov lub xeev ntawm qhov teeb meem ncaj qha los ntawm cov khoom mus rau cov roj yam tsis tau mus txog theem ua kua. Feem ntau, thaum peb ua kom sov ib qho khoom rau nws qhov melting point, nws yuav hloov nws theem mus rau cov kua. Thaum cov kua ntxiv rhuab mus rau nws lub boiling point, nws yuav hloov lub xeev mus rau ib tug roj. Qhov no tsis yog qhov teeb meem nrog sublimation. Sublimation yog cov txheej txheem ncaj qha hloov lub xeev ntawm cov khoom rau roj.
Daim duab 01: Sublimation ntawm Cov Dej Khov Qhuav
Peb tuaj yeem soj ntsuam cov txheej txheem no tsuas yog nyob rau hauv cov xwm txheej tshwj xeeb hauv cov ntaub ntawv tshwj xeeb. Ntshiab naphthalene yog cov khoom siv subliming. Lwm yam khoom uas sublimes yog cov khoom carbon dioxide, uas tseem hu ua dej khov qhuav. Iodine crystals, dej khov, thiab daus coj li subliming khoom nyob rau hauv tej yam kev mob. Cov pa cua phem hloov zuj zus los ntawm lub voos xwmfab dej khov yog dej khov subliming.
Kev Hloov Kub Kub yog dab tsi?
Peb yuav tsum xub nkag siab lub tswv yim ntawm cov cua sov kom nkag siab txog lub tswv yim ntawm kev hloov cua sov. Thermal zog, los yog cua sov, yog ib hom ntawm lub zog sab hauv ntawm lub system. Thermal zog yog vim li cas rau qhov kub ntawm lub system. Nws tshwm sim vim qhov random txav ntawm cov molecules ntawm lub cev. Txhua qhov system uas muaj qhov kub siab tshaj qhov xoom muaj qhov zoo thermal zog. Lub atoms lawv tus kheej tsis muaj thermal zog. Tab sis, atoms muaj kinetic zog. Thaum cov atoms sib tsoo nrog ib leeg thiab cov phab ntsa ntawm lub cev, lawv tso cov thermal zog li photons. Cov cua kub zoo li no yuav ua rau kom lub zog thermal ntawm qhov system. Siab dua lub thermal zog ntawm lub system, siab dua qhov randomness ntawm lub system.
Daim duab 2: Mechanisms of Heat Transfer
Daim duab saum toj no qhia txog plaub txoj hauv kev hloov pauv kub: evaporation, conduction, convection, radiation. Thaum tshav kub kub hloov yog qhov txav ntawm tshav kub ntawm ib qho chaw mus rau lwm qhov. Thaum ob lub tshuab, uas yog thermally tiv tauj, nyob rau hauv qhov sib txawv kub, cua sov los ntawm cov khoom ntawm qhov kub siab dua yuav ntws mus rau cov khoom nrog qhov kub thiab txias kom txog thaum qhov kub sib npaug. Qhov kub gradient yog qhov tsim nyog rau kev hloov pauv hloov pauv hloov pauv. Peb ntsuas tus nqi ntawm tshav kub hloov hauv watt whereas tus nqi ntawm tshav kub yog ntsuas hauv joule. Chav tsev watt sib npaug "joules ib lub sijhawm".
Qhov txawv ntawm Sublimation thiab Kev Hloov Kub Kub yog dab tsi?
Sublimation yog tus txheej txheem ntawm kev hloov lub xeev ntawm qhov teeb meem ncaj qha los ntawm cov khoom mus rau cov roj yam tsis tau mus txog theem ua kua. Thaum tshav kub kub hloov yog qhov txav ntawm tshav kub ntawm ib qho chaw mus rau lwm qhov. Qhov sib txawv tseem ceeb ntawm sublimation thiab hloov hluav taws xob yog tias sublimation yog qhov hloov pauv hauv lub xeev ntawm cov teeb meem, thaum hloov hluav taws xob yog qhov hloov pauv hauv lub xeev ntawm lub zog. Sib nrug ntawm qhov ntawd, cov cua sov tuaj yeem hloov mus rau lwm hom ntawm lub zog thiab tom qab ntawd raug xa mus, tab sis hauv sublimation, tsis muaj qhov hloov pauv tau. Tsis tas li ntawd, sublimation kuj yog ib qho kev hloov hluav taws xob los ntawm lub xeev ntawm cov teeb meem mus rau lub xeev cov roj teeb.
Hauv qab no yog cov ntsiab lus sib piv ntawm qhov sib txawv ntawm sublimation thiab hloov tshav kub.
Summary – Sublimation vs Heat Transfer
Sublimation yog ncaj qha ntsig txog kev hloov pauv hluav taws xob vim tias nws cuam tshuam txog kev hloov pauv ntawm cov khoom siv hluav taws xob hloov ntawm ib theem mus rau lwm theem ntawm cov teeb meem. Qhov sib txawv tseem ceeb ntawm sublimation thiab hloov hluav taws xob yog qhov sublimation yog qhov hloov pauv ntawm lub xeev ntawm qhov teeb meem thaum tshav kub hloov pauv yog hloov pauv ntawm lub zog.
