He aha te mea pokey? wae pokey inenga

whakaahua ana pokey te kaha o wai hau ranei ki te waihanga ātete i waenganui i neke whanaunga ki tetahi ki tetahi paparanga o te wai (e kore e totoka) tinana. Ko, hāngai tenei uara ki te kaha o te waku ā-(wā English: pokey), i takea mai i te kaupapa o te hau wai ranei. Hoki te tinana rerekē, ka waiho reira rerekē, rite tei reira ki runga i to ratou natura. Hei tauira, te wai kua whakaritea ki te honi, i te mea pokey nui teitei te pokey iti. waku ā-fluidity totoka (nuinga) rauemi ranei te āhuatanga āhuatanga rheological.

mai Kupu pokey i te Latin Viscum, e te tikanga te kohuorangi. Ko e tika ana ki te manu-kotakota, kua hanga nei i te kohuorangi hua, me whakamahia mō te hopu manu tenei. ka piripiri pania ki manga rākau me nga manu e noho ana ki runga ki a ratou, ngāwari taonga mo te tangata.

He aha te mea pokey? Ka hoatu Units o inenga o te āhuatanga, i te mea he tikanga, i roto i te pūnaha SI, me ētahi atu waeine ehara i te SI.

Ihaka Newton 1687, whakapumautia te ture taketake o te rere o tinana wai, me te haurehu waihā: F = ƞ • {(w2 - v1) / (Z2 - z1)} • S. I roto i tenei take, F - ko te kaha (tangential) e ai te nekehanga o te paparanga turanga tinana. Te ōwehenga (w2 - v1) / (Z2 - z1) E whakaatu ana te auau o te huringa o te wai hau ranei tere rere i roto i te whakawhitinga i te paparanga tetahi ki tetahi turanga. Te kore e mohiotia ana ko te tere rere rōnaki auau kutikuti ranei. Ko te rahi o te S - ko te wāhi (i roto i te wāhanga ripeka) o te rere tinana turanga. Ƞ te take proportionality ko te tau whakarea pokey o hihiri tenei tinana. Rahi, tona j kōaro = 1 / ƞ, he fluidity. mahi ai Force ia rohe wae e taea te tatau (ripeka-motu) rere rite ki te tātai: μ = F / S. reira he tino ranei pokey hihiri. Units o inenga i roto i te pūnaha SI, e taea te faaite i te reira rite te tuarua Pascal.

Ko te pokey Ko te nui ngā āhuatanga tinana-matū o matū maha. Ko tōna uara ki pūkete i roto i te hoahoa me te mahi o te taiepa, me ngā pūrere i roto i nei i reira he kaupapa (hei tauira, ki te e whakamahia ratou mo köurarangi) te reo wai haurehu waihā ranei. E nehenehe te reira hinu, hau me ratou i-hua, para whakarewa ranei karaihe, a na i runga i. Pokey i roto i te maha ngā take, ko te āhuatanga kounga o intermediates me hua whakamutunga o ngā manufactures, mai tei te reira i runga i te hanganga o te taonga, me te whakaatu kāwanatanga physico-matū o te rauemi me te huringa i roto i te hangarau. E mea pinepine, ki te whakatau tata i te ātete ki te deformation kore e whakamahi i paunga o te pokey hihiri me kinematic, e wae e whakahuatia waeine SI i roto i mita pūrua ia te rua ranei. pokey Kinematic (denoted e ν) ko te ōwehenga o te pokey hihiri (μ) ki te kiato inu (ρ): v = μ / ρ.

pokey Kinematic - he āhuatanga physico-matū o te rauemi, e whakaatu ana i tona kaha i raro i te mahi o ope tō pato'ii te te rere.

Ko te SI korerotia wae o te ine pokey kinematic te rite m2 / s.

I roto i te pokey pūnaha CGS whanganga te i te Stokes (St) ranei centistokes (Cst).

I waenganui i enei wae ine i reira ko te hononga e whai ake nei: Hk 1 = 10-4 m2 / s, ka 1 Cst = 10-2 Hk = 10-6 m2 / s = 1 mm2 / s. Mea pinepine pokey kinematic ko tetahi kōwae kore-nahanaha o inenga - tenei Engler nekehanga, e taea te kawea whakawhiti Stokes i te taha o te tātai tëtehi: v = 0,073oE - 0.063 / oe tepu ranei.

Ki te tahuri kia te whakamahi i te pokey hihiri o te wae pūnaha i roto i te whārite extrasystematic: 1 Pa • c = 10 poises. Takinga tuhituhi te: AP

Ko te tikanga e whakaritea nga wae inu pokey tuhinga normative i runga i te oti (arumoni) hua ranei tukanga whakaritenga i runga i interm tahi ki te whānuitanga manakohia o rerekētanga o tenei āhuatanga ine kounga, me hoki ki te hapa o te inenga.

Hei whakatau i te pokey i raro i taiwhanga tikanga ahumahi ranei he viscometers ngā whakaaro. Ka taea e kia ratou hurihuri, ki te pōro, capillary, ultrasonic. Ko te parau tumu o te ine i te pokey o te viscometer capillary karaihe e hāngai ana i runga i te whakatau i te wa paunga o te wai i roto i te ngongo weu tukuoro te o te tetahi diameter me te roa, me whakaaro te tamau o te viscometer. Mai tei te pokey o te rauemi i runga i te pāmahana (ki te whakanui ake i te reira ka whakaiti i te reira e tika ana ki te ariā nekeneke rāpoi rite ki te hua o te whakaterenga o te nekehanga tupurangi me ngā taunekeneke o ngā rāpoi ngota), te tikanga kia pera tonu taua tauira whakamātautau mō etahi wa i tetahi pāmahana hoki wawaenga te whakamutunga puta noa i te rōrahi o te tauira. He maha ngā tikanga o te whakamātautau pokey paerewa, engari te noa tino - he halá GOST paerewa 33-2000, e te takoto i runga i te pokey kinematic, te wae i roto i tenei take mm2 / s (Cst), me te pokey hihiri tatau anō te rite te hua o te pokey kinematic i te kiato.