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Video: Dab tsi yog ficks?
![Video: Dab tsi yog ficks? Video: Dab tsi yog ficks?](https://i.ytimg.com/vi/CYmhAUoREAg/hqdefault.jpg)
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
: kev dav dav hauv lub cev uas hais tias cov ntshav ntws sib npaug rau qhov sib txawv ntawm cov tshuaj hauv cov ntshav thaum nws nkag mus thiab tawm hauv lub cev thiab uas yog siv los txiav txim siab lub plawv los ntawm qhov sib txawv ntawm cov pa oxygen hauv cov ntshav ua ntej nws nkag mus thiab tom qab nws tawm ntawm lub ntsws
Raws li, Fick's equation yog dab tsi?
Qhov yooj yim sib npaug rau huab hwm coj hloov los ntawm molecular diffusion yog Fick cov txoj cai lij choj uas tuaj yeem hais raws li: N A = - d A B d C A d y. qhov twg N. A yog qhov hloov pauv huab hwm coj ib cheeb tsam (kmol/m2s), Kuv A yog molar concentration ntawm diffusing tivthaiv thiab D. AB yog molecular diffusivity.
Zoo sib xws, Ficks thawj txoj cai sib kis yog dab tsi? Fick cov 1st txoj cai ntawm diffusion Diffusion tshwm sim nyob rau hauv cov lus teb rau cov concentration gradient qhia raws li kev hloov pauv hauv kev mloog vim kev hloov pauv txoj haujlwm,. nyob rau hauv uas flux J [cm-2 s-1] yog qhov sib npaug rau qhov diffusivity [cm2/s] thiab qhov tsis zoo ntawm qhov siab, [cm-3 cm-1] los yog [cm-4].
Tsis tas li, Fick txoj cai siv rau dab tsi?
Fick txoj cai ntawm diffusion piav qhia diffusion thiab tau muab los ntawm Adolf Fick hauv 1856. Lawv tuaj yeem yog siv los daws qhov diffusion coefficient, D. Fick cov thawj txoj cai ua tau siv kom tau txais nws thib ob txoj cai uas nyob rau hauv lem yog zoo tib yam rau qhov sib npaug diffusion.
Qhov txawv ntawm Fick txoj cai thawj thiab tsab cai thib ob yog dab tsi?
Cov thawj txoj cai tsuas yog tuaj yeem siv rau cov kab ke uas cov xwm txheej tseem zoo ib yam- hauv lwm lo lus, yog tias cov dej ntws los rau hauv cov kab ke sib npaug cov dej ntws tawm mus. Fick txoj cai thib ob muaj feem xyuam rau kev tshawb fawb lub cev thiab lwm yam kab ke uas tab tom hloov pauv.
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