Vena-kev cog lus yog ib ntu hauv qhov chaw uas muaj qhov tsawg kawg nkaus ntawm ntu ntu thiab muaj qhov siab tshaj plaws. Ntawm no, tag nrho cov streamlines yog parallel, ncaj, thiab uniform, yog li muaj laminar ntws. Nws yog xam los ntawm cheeb tsam ntawm lub qhov ncauj (Ao) thiab cov coefficient ntawm contraction (Cc).
Vena contracta tsim qhov twg yog yam ntxwv ntawm nws?
Vena contracta yog qhov taw qhia hauv cov kwj dej uas qhov txoj kab uas hla ntawm tus kwj dej yog qhov tsawg tshaj plaws, thiab cov dej tshaj tawm yog qhov siab tshaj plaws, xws li hauv cov dej ntws. tawm ntawm lub nozzle (orifice). (Evangelista Torricelli, 1643). Nws yog qhov chaw uas qhov chaw hla ntu tsawg kawg nkaus.
Vena contracta nyob rau hauv orifice nyob qhov twg?
in orificemeter siab tshaj contraction los yog Vena Contracta yuav siv sij hawm qhov chaw ntawm ib ntu me ntsis hauv cov kwj deg ntws, ntawm ntu ntawd qhov twg lub dav hlau ntau dua lossis tsawg dua kab rov tav. Qhov tshwm sim no tshwm sim vim cov kua dej ntws tsis tuaj yeem hloov pauv sai sai.
Puas yog contraction tsawg kawg ntawm vena contracta?
Lub siab siv ntawm vena contracta yog atmospheric. Contraction yog tsawg kawg ntawm vena contracta. Cov kab kwj yog sib npaug thoob plaws lub dav hlau ntawm vena contracta. Coefficient ntawm contraction yog ib txwm tsawg dua ib.
Vena contracta hauv orifice yog dab tsi?
Vena contracta txhais tau tias yog qhov nqaim tshaj plaws hauv nruab nrab ntawm lub dav hlau uas tshwm sim ntawm, lossis tsuas yog nqes mus rau, lub qhov ncauj ntawm lub valve regurgitant… lub vena contracta sawv cev rau ib qho kev ntsuas ntawm thaj chaw zoo regurgitant orifice, uas yog qhov nqaim tshaj plaws ntawm qhov tseeb ntws.
