Qhov sib txawv ntawm qhov nrawm ntawm cov txheej txheem ntawm cov kua dej uas nyob ib sab hu ua qhov nrawm nrawm thiab muab los ntawm v / x, qhov twg v yog qhov nrawm sib txawv thiab x yog qhov kev ncua deb ntawm cov khaubncaws sab nraud povtseg.
Vim li cas thiaj muaj qhov nrawm nrawm?
Tus nqi ntawm kev sib txhuam yog nyob ntawm cov kua viscosity thiab qhov nrawm nrawm (uas yog, qhov txheeb ze tshaj tawm ntawm cov dej txheej). Cov gradients tshaj tawm tau teeb tsa los ntawm qhov tsis muaj kev cuam tshuam ntawm phab ntsa. … Thaum cov kua dej nyob ruaj ruaj, nws cov molecules nyob rau hauv ib qho kev txav mus tas li nrog lub nrawm nrawm v.
Puas yog gradient tib yam li tshaj tawm?
Qhov kev nrawm nrawm tuaj yeem txhais tau tias tus nqi hloov pauv nrog rau qhov kev ncua deb. … Ceeb toom: Qhov gradient ntawm ib qhov ntau sawv cev qhov kev hloov raws qhov kev ncua deb. Yog li txhua qhov ntau qhov gradient yuav yog w.r.t. nrug.
Dab tsi yog tus qauv ntawm qhov nrawm nrawm nrawm?
Dimensional formula for velocity is $\left[L{{T}^{-1}} right]$ vim kev tshaj tawm txhais tau tias yog tus nqi hloov pauv nrog lub sijhawm.
Yuav ua li cas yog tus qauv rau siab gradient?
Yog li ntawd, lub siab gradient yog dimensionally sawv cev li [M1 L-2 T-2].
