Vim li cas Aluminium Transfers Thaum tshav kub kub npaum li cas
Aluminium sib txuas cov thermal conductivity ntawm kwv yees li 235 W / m·K nrog qhov ceev ntawm tsuas yog 2.70 g / cm³, uas yog vim li cas nws ua rau cov dab dej kub, radiator cores thiab thermal spreaders. Dawb electrons nqa feem ntau ntawm lub zog thaum lattice vibrations, los yog phonons, tuav cov seem, yog li cov cua sov kis tau los ntawm cov khoom seem es tsis txhob sib sau rau hauv ib qho chaw kub. Copper tseem ua tau zoo dua ntawm 401 W / m·K, tab sis nws hnyav dua peb zaug, yog li ntawm cov khoom siv hluav taws xob - rau - pawg aluminium feem ntau yeej hauv ib lub thawv.
Kev lag luam qib ntshiab xws li 1050, 1060 thiab 1100 muab qhov ua tau zoo tshaj plaws. Alloying cov ntsiab lus tawg electrons thiab rub tus lej qis, yog li cov txiaj ntsig hauv qab no yog kev taw qhia sizing es tsis yog hloov rau cov ntaub ntawv pov thawj zeb xeem.
| Qib / temper | Thermal conductivity ntawm 20℃(W / m·K) | Hom thermal ua haujlwm |
|---|---|---|
| 1060-O | 234 | Busbars, thermal spreaders, ntawv ci cores |
| 3003-H14 | 193 | Radiator fins, tshav kub exchanger raj |
| 6061-T6 | 167 | Cov txheej txheem cua sov dab dej, cov phaj txias |
| 5052-H32 | 138 | HVAC thiab marine vaj tse |
| 5083-O | 117 | Cryogenic thiab cov khoom siv siab |
Thermal Expansion: Tus tsim tsav tsheb tsis muaj leej twg tuaj yeem tsis quav ntsej
Lub linear coefficient ntawm thermal expansion ntawm txhuas yog hais txog 23 × 10-6per K, ze rau ob zaug ntawm 12 × 10-6rau K ntawm cov qauv hlau. A 1 m txhuas qhov yog li ntawd loj hlob roughly 0.023 hli rau txhua 1℃ntawm qhov kub thiab txias hloov, uas yog vim li cas expansion qhov khoob, slotted bolt qhov thiab ua raws li cov nplaum txheej tshwm sim nyob qhov twg cov hlau siv structurally. Cov coefficient belongs rau aluminium lattice es tsis txhob npau taws, yog li kev xaiv alloy NW nyuam qhuav hloov nws, thiab kev txheeb xyuas raws li ASTM E228 thawb- qws dilatometry.
Thaum tshav kub kub Exchangers, Fins thiab Microchannel Geometry
Cov conductivity-rau- qhov hnyav piv ntawm txhuas yog kwv yees li kaum tsib npaug ntawm cov hlau, uas yog vim li cas HVAC coils, tsheb radiators thiab condensers yog tsim los ntawm nws. Fins ntawm li 0.1 hli multiply deg cheeb tsam ntawm qhov hnyav negligible, thiab cov hlab microchannel nce mus ntxiv los ntawm kev thawb cov tub yees los ntawm ntau qhov sib npaug me me es tsis txhob muaj ob peb qhov loj.
Cov ntawv ci thiab fin Tshuag yog muab nkag rau hauv 1100, 1200, 3003, 8011 thiab 8006, nrog 8011 thiab 8006 siv qhov xav tau ntau dua fin.
Clad brazing ntawv nqa ib txheej 4004 lossis 4045 alloy yog li ib lub qhov cub hluav taws xob dhau mus koom ua tiav cov tub ntxhais radiator.
Phaj-fin cores haum rau huab cua- cov khoom siv hluav taws xob txias thiab compressed- cua tshuab ziab khaub ncaws qhov twg compactness tseem ceeb tshaj qhov ntsuas siab.
Lub zog ntawm qhov kub thiab txias
Ntshiab aluminium melts ntawm txog 660 degree, thiab lub qab nthab zoo li txhua qhov siab - qhov kev txiav txim siab kub. Lub zog tawm los poob qis tshaj li ntawm 150 degree, thiab kev pabcuam txuas ntxiv siab tshaj 400℃ua rau nplej - ciam teb diffusion uas txias tsis tuaj yeem thim rov qab, thaum lub sijhawm luv luv mus rau 300℃nqi txog ib nrab ntawm chav- qhov kub ntawm lub zog tsuas yog kom txog rau thaum qhov rov qab mus rau qhov chaw. Lim-hardened 3003, 3004, 5052 thiab 5083 haum cov kev pabcuam sov, thiab thaum txias kawg cov hlau nce ductility thiab notch toughness, uas tso 5083, 5052 thiab 6061 nyob rau hauv liquefied- roj tso tsheb hlau luam thiab lub voj voos absorbion.
Coatings, Joints thiab Practical Limitations
Anodizing, pleev xim rau thiab hmoov txheej tag nrho txo qhov kev ua tau zoo vim tias cov oxide lossis polymer txheej insulates, yog li cov chaw thermal interface raug npog ua ntej ua tiav. Qhov twg txhuas tau ntsib hlau lossis tooj liab nyob rau hauv ib qho chaw ntub thiab sov, galvanic corrosion tswj tus qauv tsim thiab hu rau insulated washers los yog ib tug sacrificial txheej. Aluminium kuj zam tsawg dua siab - lim thermal cycles dua titanium los yog npib tsib xee- puag alloys, yog li cov pob qij txha yuav tsum tau ua raws li geometry. Brazing nrog aluminium-silicon muab tub lim ua kom sib koom ua ke kub hauv qab qhov sib txawv ntawm cov niam txiv cov hlau, thiab kev sib txhuam do vuam txwv qhov porosity ntawm tuab - ntu cov pob qij txha.
Cov lus nug nquag
Q: Lub thermal conductivity ntawm aluminium yog dab tsi?
Ntshiab txhuas ua txog 235 W / m·K ntawm chav tsev kub, thaum cov alloys xws li 3003, 6061 thiab 5052 poob ntawm kwv yees li 120 thiab 195 W / m·K.
Q: Puas yog tooj liab zoo dua thermal conductor dua li txhuas?
Copper ua txog 401 W / m·K tawm tsam 235 W / m·K rau txhuas, tab sis txhuas hnyav li ib feem peb ntau, yog li nws cov conductivity - rau - qhov hnyav piv feem ntau yog cov txiaj ntsig zoo dua.
Q: Ntau npaum li cas aluminium nthuav thaum rhuab?
Lub linear coefficient yog hais txog 23 × 10-6per K, yog li 1 m aluminium bar loj hlob roughly 0.023 mm rau 1℃thiab txog 0.23 mm tshaj 10℃nce.
Q: Puas tuaj yeem siv txhuas siv ntau dua 300 degree?
Kev mus ncig luv luv tuaj yeem zam tau vim tias lub zog poob ntawm cov cua sov rov qab los tom qab txias, tab sis kev pabcuam txuas ntxiv saum 400℃degrades grain ciam mus tas li.
Q: Vim li cas aluminium fins tsuas yog 0.1 hli tuab?
Nyias fins nce thaj tsam ntawm ib chav tsev ntim thaum khaws qhov hnyav thiab cov khoom siv qis, thiab cov khoom siv hluav taws xob yog siab txaus uas cov fin nyob ze ze isothermal raws nws qhov ntev.
