Dab tsi ua rau muaj viscosity hauv lub tshuab ziab khaub ncaws ... Yuav ua li cas tswj
Kev Txheeb Xyuas:
Cov khoom noj uas txau qhuav muaj ob pawg: tsis nplaum thiab nplaum. Cov khoom xyaw uas tsis nplaum yooj yim rau txau kom qhuav, tsim kom yooj yim rau lub tshuab ziab thiab cov hmoov kawg ntws tau yooj yim. Piv txwv ntawm cov khoom siv uas tsis nplaum suav nrog hmoov qe, hmoov mis nyuj, cov tshuaj thiab lwm yam maltodextrin, cov pos hniav thiab cov protein. Hauv cov khoom noj uas nplaum, muaj teeb meem qhuav hauv qab cov xwm txheej ib txwm muaj ntawm kev txau kom qhuav. Cov khoom noj uas nplaum feem ntau lo rau ntawm phab ntsa ntawm lub tshuab ziab, lossis ua cov khoom noj nplaum tsis muaj txiaj ntsig hauv cov chav ziab thiab cov txheej txheem thauj mus los, nrog rau teeb meem ua haujlwm tsawg thiab cov khoom tsim tau. Cov khoom noj qab zib thiab kua qaub yog cov piv txwv ib txwm muaj.
Viscos yog ib qho tshwm sim uas ntsib thaum lub sijhawm ziab cov khoom noj uas muaj glycolic acid ntau. Cov viscosity ntawm hmoov yog ib hom kev ua tau zoo ntawm kev sib txuas. Nws tuaj yeem piav qhia txog cov viscosity ntawm cov khoom me me (cohesion) thiab cov viscosity ntawm phab ntsa (adhesion). Qhov ntsuas ntawm lub zog sib txuas nrog cov hmoov me me yog vim nws cov yam ntxwv sab hauv hu ua cohesion, tsim cov pawg hauv lub txaj hmoov. Yog li ntawd, lub zog uas xav tau los tawg los ntawm cov hmoov agglomerate yuav tsum ntau dua li qhov cohesion. Kev sib txuas yog ib qho kev ua tau zoo ntawm qhov interface, thiab cov hmoov me me ua raws li qhov sib txawv ntawm cov khoom siv tsuag ziab. Kev sib txuas thiab kev sib txuas yog cov yam ntxwv tseem ceeb rau kev tsim cov xwm txheej ziab thiab ziab. Cov khoom sib xyaw ntawm cov hmoov me me yog lub luag haujlwm tseem ceeb rau viscosity. Qhov sib txuas thiab kev sib txuas ntawm cov khoom siv saum npoo ntawm cov hmoov me me txawv. Vim tias kev ziab xav tau ntau cov solute kom hloov mus rau saum npoo ntawm cov khoom me me, nws yog qhov loj. Ob qho yam ntxwv viscosity (cohesion thiab adhesion) tuaj yeem nyob ua ke hauv cov khoom noj uas muaj suab thaj ntau. Qhov viscosity ntawm cov khoom me me yog kev tsim cov choj kua ruaj khov, cov choj kua txav mus los, cov saw hlau ntawm cov molecules, thiab lub ntiajteb txawj nqus electrostatic thiab cov choj khoom khov. Qhov laj thawj tseem ceeb rau cov hmoov phab ntsa lo rau hauv chav ziab yog vim cov khoom siv hauv cov suab thaj thiab cov khoom noj uas muaj kua qaub ntau dhau poob. Thaum cov hmoov khaws cia ntev dua, nws yuav qhuav rau ntawm phab ntsa.
Nws ua rau viscous
SCov txheej txheem ziab hmoov uas muaj ntau yam khoom noj uas thov Vajtswv rov ua dua tshiab. Cov suab thaj uas tsis muaj molecular hnyav yog qhov nyuaj heev (glucose, fructose) thiab cov organic acids (citric acid, malic acid, tartaric acid). Cov tshuaj molecular me me xws li kev nqus dej siab, thermoplasticity thiab qhov kub hloov pauv vitrification qis (Tg) ua rau muaj teeb meem viscosity. Qhov kub ziab tsuag siab dua Tg20°C. Feem ntau ntawm cov khoom no tsim cov khoom mos mos ntawm qhov chaw viscous, ua rau cov hmoov viscosity, thiab thaum kawg tsim cov qauv nplaum es tsis yog hmoov. Lub zog molecular siab ntawm cov molecule no yog vim nws qhov kub hloov pauv vitrification qis (Tg), uas ua rau muaj teeb meem viscosity hauv cov tshuab ziab tshuaj tsuag uas feem ntau nrov ntawm qhov kub. Cov yam ntxwv tseem ceeb ntawm qhov kub hloov pauv iav thiab qhov kub hloov pauv theem amorphous. Qhov xwm txheej hloov pauv iav tshwm sim hauv cov khoom tawv, amorphous qab zib, uas tau hloov pauv mus rau hauv cov roj hmab mos mos kua theem. Lub zog ntawm qhov chaw thiab cov iav khov kho muaj lub zog ntawm qhov chaw qis thiab tsis lo rau cov khoom khov kho qis zog. Vim yog lub xeev ntawm iav mus rau roj hmab ferry (lossis kua), qhov chaw ntawm cov khoom tuaj yeem tsa, thiab kev sib cuam tshuam ntawm cov molecule thiab qhov chaw khov kho tuaj yeem pib. Hauv kev ua haujlwm ziab zaub mov, cov khoom lag luam nyob rau hauv lub xeev kua lossis nplaum, thiab cov khoom noj kua / nplaum uas tshem tawm cov neeg sawv cev yas (dej) dhau los ua iav. Yog tias cov khoom noj raw tsis hloov pauv ntawm qhov kub qhuav siab dua li qhov kub iav, cov khoom yuav tswj tau qhov viscosity siab zog. Yog tias hom khoom noj no raug kov nrog qhov chaw khov kho siab zog, nws yuav lo lossis lo rau nws.
Tswj cov viscosity
Muaj ntau txoj kev tshawb fawb txog cov ntaub ntawv thiab cov txheej txheem raws li cov txheej txheem los txo qhov viscosity. Cov txheej txheem yooj yim ntawm kev tshawb fawb txog cov ntaub ntawv suav nrog cov ntaub ntawv nrog cov khoom siv uas muaj cov tshuaj ntxiv rau kom qhuav cov kua kom ua rau qhov kub thiab txias dua sab nraud ntawm kev hloov pauv vitrification, thiab cov txheej txheem raws li cov txheej txheem suav nrog phab ntsa thiab hauv qab ntawm lub chamber tshuab.
Lub sijhawm tshaj tawm: Lub Ob Hlis-22-2024