Thermal conduction

Thermal conduction yog kev hloov cov cua sov los ntawm kev sib tsoo ntawm microscopic ntawm cov khoom thiab kev txav ntawm electrons ntawm cov khoom sib txawv kinetic zog. Ntxiv nrog rau qhov kub thiab txias, kev tshem tawm cov khib nyiab los ntawm thermal conduction yog nyob ntawm qhov thermal conductivity ntawm cov khoom uas lub dab dej kub yog tsim los ntawm thiab cov geometry ntawm lub dab dej kub. Cov hlau, hlau alloys, qee cov hlau oxides, ceramics, pob zeb diamond thiab lwm yam ntaub ntawv ntawm carbon yog zoo thermal conductors. Graphene, ib qho allotrope ntawm carbon nyob rau hauv daim ntawv ntawm ob-dimensional, atomic-scale, hexagonal lattice, muaj ib tug astonishingly siab thermal conductivity ntawm 5000 W / mK. Ntawm cov hlau, tooj liab ntshiab muaj cov thermal conductivity siab tshaj (kwv yees 400 W / mK). Aluminium thiab nws cov alloys muaj cov thermal conductivity nyob rau hauv thaj tsam ntawm 90-240 W/mK. Ceramics, uas yog ob qho tib si hluav taws xob cais thiab thermally conductive, muab cov thermal conductivity ntawm 100-200 W/mK. Hauv LED teeb pom kev zoo, kev coj ua yog thawj hom kev hloov hluav taws xob raws txoj kev thermal. Nws pib ntawm lub semiconductor hlws ris thiab lub thermal load mus los ntawm ib tug series ntawm Cheebtsam kom xaus ntawm convection nto ntawm lub dab dej kub.