Dab tsi yog qhov cuam tshuam ntawm qhov kub thiab txias ntawm cov ntsuas oxygen yaj?
Solubility ntawm oxygen nyob ntawm qhov kub thiab txias, siab, thiab cov ntsev yaj hauv dej. Tsis tas li ntawd, oxygen diffuses sai dua los ntawm kev daws teeb meem dua li ntawm daim nyias nyias. Yog tias tus nqi ntws qeeb dhau, kev cuam tshuam yuav tshwm sim.
1. Kev cuam tshuam ntawm qhov kub thiab txias: Vim qhov kub hloov pauv, qhov diffusion coefficient ntawm daim nyias nyias thiab solubility ntawm oxygen yuav hloov pauv, cuam tshuam ncaj qha rau cov zis tam sim no ntawm cov pa oxygen electrode yaj. Thermistor feem ntau yog siv los tshem tawm qhov cuam tshuam ntawm qhov kub thiab txias. Raws li qhov kub thiab txias, qhov diffusion coefficient nce, tab sis cov solubility tiag tiag txo. Cov nyhuv ntawm qhov kub thiab txias ntawm cov coefficient ntawm solubility a tuaj yeem kwv yees raws li Henry txoj cai, thiab cov txiaj ntsig ntawm qhov kub ntawm cov membrane diffusion coefficient tuaj yeem kwv yees raws li Arrhenius txoj cai.
(1) Lub solubility coefficient ntawm oxygen: Raws li lub solubility coefficient a tsis yog tsuas yog cuam tshuam los ntawm kub, tab sis kuj los ntawm cov muaj pes tsawg leeg ntawm cov tshuaj. Nyob rau tib lub pa ib nrab siab, qhov tseeb oxygen concentration ntawm cov khoom sib txawv kuj yuav txawv. Raws li Henry txoj cai, oxygen concentration yog ncaj qha proportional rau nws ib nrab siab. Rau cov kev daws teeb meem dilute, qhov kev hloov pauv ntawm solubility coefficient vim qhov kub hloov pauv yog li 2% / degree.
(2) Lub diffusion coefficient ntawm daim nyias nyias: Raws li txoj cai Arrhenius, kev sib raug zoo ntawm solubility coefficient thiab kub T yog C =KPo2 · exp (- / T). Piv txwv tias K thiab Po2 yog qhov tsis tu ncua, tuaj yeem suav ua 2.3% / degree ntawm 25 degree. Tom qab xam cov solubility coefficient a, diffusion coefficient ntawm daim nyias nyias tuaj yeem xam los ntawm kev sib piv cov ntsuas ntsuas thiab ntsuas qhov ntsuas qhov ntsuas (tso tseg cov txheej txheem suav ntawm no). Lub diffusion coefficient ntawm daim nyias nyias yog 1.5% / degree ntawm 25 degree.
