Kuyini ukuzinza kwe-shear kwamafutha?

Kuyini ukuzinza kwe-shear kwamafutha?

Linganisa inkomba yekhwalithi yamafutha kanye nemingcele yabaningi, namuhla sizokhuluma / ukuzinza kwe-shear, imele amafutha yiziphi izici zemvelo? Isimo sosuku sikuchazele ngokucophelela.

Kuyini ukusika? Ngaphambi kokuthi [shear stability], sizoba ngabokuqala ukwethula umqondo/ukugunda futhi ukugunda igama lezakhiwo. Ngaphakathi kokufinyeleleka kalula kokuqondile kubhekisela kulokhu: kupheya yobukhulu obufanayo, ekhomba amandla asemaceleni aphambene (okungukuthi, i-perpendicular endimeni yamandla), impahla yesigaba esiphambanayo eduze kwesiqondisindlela samandla angaphandle wephutha elihlobene. kanye ne-deformation phenomenon.

Uma uthi nhlá ezinye abstract, kodwa sicela ugcizelele: deformation phuca amandla ukusabela kawoyela emafutheni, libhekisela amangqamuzana uwoyela ngaphansi lokushisa eliphezulu kanye nomfutho ophakeme, ngenxa yokucindezeleka kanye nokucindezeleka phuca of molecule kawoyela ephukile kanye deformation, okuthinta i-viscosity yamafutha ngokwawo.

Ukuzinza kwe-Shear, ngaphambi kokuqonda imiqondo emibili, masinqume ngokusemthethweni ukuzinza incazelo: ukuzinza kwe-shear kumelela uwoyela wokugcoba ngaphansi kwe-shear mechanical, imvelo ye-RCC ingagcina i-viscosity ezinzile.

Ukuzinza okuhle kwe-shear, uwoyela wokugcoba ungagcina uzinzile ku-viscosity ye-shear yemishini, umjikelezo wokusebenzisa, umphumela wokugcoba uwoyela wenjini uzinzile. Ukuzinza kwe-Shear, i-viscosity yamafutha okugcoba iyancipha ngenxa yokugunda. Intuitively, ingabe uwoyela is thinning.

Isiphetho: ukuzinza kwe-shear kuhle noma kubi, kuzothinta umphumela wokusetshenziswa kwamafutha ngaphansi kokushisa okuphezulu nokucindezela okukhulu, kanye nempilo yesevisi ephumelelayo yamafutha enjini.

Indlela yokuthuthukisa ukuzinza kwe-shear ukuze kuthuthukiswe ukuzinza kwe-shear yamafutha, ososayensi bazokwengezwa ku-oil viscosity index improver, lokhu kuwuhlobo lwe-polymer ezwelayo lokushisa.

Emazingeni okushisa aphezulu, ukwelula kweketango lamangqamuzana, ukwanda kokungqubuzana kwamafutha ayisisekelo, umphumela wokuvimbela uketshezi lwamafutha, okungukuthi ukwanda kwe-viscosity, i-lubricant viscosity yehla ngezinga elithile.

Ngokuvamile, ngenxa yefomula kawoyela ephindaphinda njalo, mahhala ukwaba ingqikithi kawoyela inezinzuzo eziningi ekuzinzeni kwe-shear.