Chii chinonzi shear kugadzikana kwemafuta?

Chii chinonzi shear kugadzikana kwemafuta?

Edza iyo mafuta emhando index uye paramita yevakawanda, nhasi isu tichataura / kugera kugadzikana, inomiririra mafuta ndeapi maficha echisikigo? Day state inyatso tsanangura iwe.

Kuchekwa chii? Pamberi pe [kugadzikana kwekugera], isu tichave vekutanga kusuma iyo pfungwa / kugera uye kugera inguva yekuvaka. Mukati mekusvika kuri nyore kwechakananga kunoreva: muhuviri hwehukuru hwakafanana, kunongedza kune akapesana lateral masimba (kureva, perpendicular kune basa resimba), zvinhu zvechikamu chemuchinjikwa pamwe negwara rekunze kwesimba rekukanganisa. uye deformation phenomenon.

Pakutanga kuona zvimwe zvisinganzwisisike, asi ndapota simbisa: deformation shear force reaction yemafuta mumafuta, inoreva mamorekuru emafuta ari pasi pekushisa kwepamusoro uye kumanikidzwa kukuru, nekuda kwekushushikana uye kushushikana kweshear kwemamorekuru emafuta kwakatyoka uye deformation. kukanganisa viscosity yemafuta pachayo.

Shear kugadzikana, pamberi pekunzwisisa kwemazano maviri, ngatiitei zviri pamutemo kuveura kugadzikana tsananguro: shear kugadzikana ndiye mumiriri wemafuta ekuzora pasi pemechani shear, hunhu hweRCC hunogona kuchengetedza yakagadzikana viscosity.

Yakanaka shear kugadzikana, mafuta ekuzora anogona kuramba akatsiga mune mechaniki shear viscosity, shandisa kutenderera, injini yemafuta ekuzora mhedzisiro yakanyatso kugadzikana. Shear kugadzikana, mafuta ekuzora viscosity inoderera nekuda kwekugera. Intuitively, iko mafuta ari kuonda.

Mhedziso: kugadzikana kweshear kwakanaka kana kwakashata, kuchakanganisa kushandiswa kwemafuta pasi pekushisa kwepamusoro uye kudzvinyirira kwakanyanya, pamwe chete nehupenyu hunobudirira hwebasa rejini injini.

Nzira yekuvandudza kugadzikana kweshear kuitira kuti uvandudze kugadzikana kwekugera kwemafuta, masayendisiti anozowedzerwa mumafuta viscosity index inovandudza, iyi imhando yekushisa kwepolymer.

Pakupisa kwepamusoro, mamorekuru ayo anotambanudzwa, kukweshana kuwedzera kweoiri yepasi, mafuta emvura inovharira mhedzisiro, kureva kuwedzera viscosity, lubricant viscosity yakadzikira kusvika pamwero wakati.

Kazhinji, nekuda kweiyo inogara iterative oiri formula, yemahara kugovera iyo yakazara synthesis yeoiri ine zvimwe zvakanakira mukuveura kugadzikana.