Lub diffusion coefficient - nyob qhov twg thiab ntau npaum li cas

Lub caij ntuj sov! Sun, Thaum tshav kub kub, huab cua, tsis hnov tsw ntawm freshly txiav nyom. Nyom yuav ua li cas nyob deb deb, thiab tsis hnov tsw yog muaj. Qhov no yog qhov physics, qhov no tshwm sim yog hu ua diffusion. Thiab nws yog txiav txim los ntawm lub allergic hais tej nyob rau hauv kev sib cuag nrog txhua lwm yam. Piv txwv li, raws li ntawm tam sim no, cov nyom los mus rau hauv kev sib cuag nrog huab cua, thiab tsis hnov tsw ntawm txiav nyom kis tau los ntawm cov huab cua nyob deb deb ntawm lub txiav nyom. Ib tug zoo xws li cov txheej txheem yog feem ntau yus muaj los ntawm xws li ib tug magnitude li cov diffusion coefficient.

Peb yuav hais tias txhua yam uas tshwm sim ib ncig ntawm peb yog lom zem ntau vim cov txheej txheem ntawm interpenetration. Vim li no cov phenomenon, peb txawm nyob. Yuav ua li cas yog li ntawd, ceeb txog qhov ntawd? allergic ntawm cov pa los yog cov as-ham rau hauv cov ntshav - qhov no yog qhov tiag diffusion ntawm ib yam khoom uas penetrates ntau. Thoob plaws diffusion nyob rau hauv qhov yog ntau dav heev tshaj peb xav hais tias. Xws li ib tug tshwm sim yog tsis ib yam dab tsi txawv, tab sis nyob rau hauv tsis tooj, yog dav sawv cev nyob rau hauv lub ntiaj teb no. Txawm lub fact tias cov huab cua exhaled los ntawm txiv neej tsis noog ib ncig thiab dispersed nyob rau hauv qhov chaw, kuj vim diffusion.

Interpenetration yuav tshwm sim nyob rau hauv ib tug ntau yam ntawm lub cev - kua, gaseous thiab khoom. Nws ua yog lub chaotic suab ntawm cov tshuaj yeeb dej caw molecules. Los ntawm txoj kev, lub phenomenon ntawm diffusion yog suav tias yog nyob rau hauv lub molecular-kinetic kev tshawb xav ntawm ib qho ntawm cov txhawb yam tseem ceeb ntawm nws. Tam sim no, rov qab mus rau hauv lub cev ntawm aggregation: lub permeation tus nqi ntawm ib yam khoom nyob ntawm nws lub xeev ntawm aggregation thiab ntawm tej qhov ntau li cov diffusion coefficient.

Yuav ua li cas yog no mysterious tswvyim? Yog li ntawd hu ua ntau cov yam ntxwv ntawm lub hloov lwm lub tsev tus nqi ntawm molecular tshuaj nyob rau hauv lwm yam. Lub diffusion coefficient, uas yog heev txog mis, tso cai rau kev ntsuam xyuas ntawm tus nqi ntawm cov tshuaj yeeb dej caw dhau los ntawm lub tsev cheeb tsam (square meter) ib chav tsev lub sij hawm (thib ob).

Nyob rau hauv kev xyaum, nws pom hais tias nyob rau hauv gases interpenetration tshwm sim feem ntau sai heev, thiab tus nqi ntawm allergic yog tsawg heev nyob rau hauv cov khib nyiab. Nyob rau diffusion coefficient ntawm lub hwj ntawm lub cev kub thiab lub concentration ntawm tshuaj kev sib nrig sib ze. Nrog ua kub interpenetration tus nqi tsub kom nrog ua concentration ntawm cov tshuaj yeeb dej caw - nkaus thiab.

Yog li interpenetration phenomenon yog vim li ntawd-hu ua concentration gradient los yog kub gradient. Los ntawm hom ntawm diffusion yog muab faib ua dawb thiab yuam. Yuam tshwm sim nyob rau hauv tus ntawm lwm cov rog. Nyob ntawm seb lawv hom yuam diffusion yog txhais raws li ib tug thermal, hluav taws xob, thiab baro upward.

Diffusion yog dav siv nyob rau hauv cov kos duab. Ib qho ntawm feem raug piv txwv - diffusion welding. Lub essence ntawm no technology yog yooj yim: txuas ob tug sib txawv lub cev (cia nws muaj ob tug hlau), thiab ces raug lawv rau siab thiab kub. Xeem nyob rau hauv qhov ntau tsawg tshaj li tus melting kub ntawm lub substance.

Cov no pub ntxiv tshaj ntawm ob tug txawv cov ntaub ntawv. Tej technology yog dav siv nyob rau hauv hluav taws xob thiab hluav taws xob kev lag luam, nyob rau hauv qhov siv thiab ua loj Cheebtsam ntawm complex zoo, thiab nyob rau hauv lub sim me me-scale lawm. Tej vuam tej zaum yuav nqa tawm nyob rau hauv dav ua tej yam kev mob, mus nqus tej yam kev mob, tag nrho cov txiav txim los ntawm cov kev uas yuav tsum tau rau cov khoom tiav.

Lwm Attendance ntau, siv lub phenomenon ntawm diffusion yog nws siv rau zus tau tej cov semiconductor lug. Ib tug ntawm cov yees rau tsim p-n junctions yog raws li nyob rau tshwm sim ntawm interpenetration. Thaum raug kev kub muaj peevxwm, nce lub melting kub, ib tug siv lead ua qauv yog tau nrog cov yam cheeb tsam concentration ntawm impurities.

Xav txog lub tswvyim ntawm "diffusion coefficient" pub kom tsis tshua muaj neeg coob leej ntau tus interpenetration tshuaj nyob rau hauv cov xwm, raws li zoo raws li nyob rau hauv ntau yam embodiments ntawm nws siv nyob rau hauv cov kos duab.