MUODILAI BERNULLI dar gidrodinamika

MUODILAI BERNULLI dar gidrodinamika, muodilai aso­sii gidrodinamikaro guyand, ki aloqai bayvi surati moei ravon (v) va R fishori on (r)- L ro hangomi ustuvor (stasionar) budani jorishavi ifoda mekunad.

Daniel Bernulli (1738) az qonuni baqoi energiyai moei vohidi hajm istifoda burda in muodilaro yoft. Dar maydoni quvvai vaznivi baroi moeoti idealii zichiashoi tagyirnayobanda Muodilai  Bernulli chunin ast:

+ pgA -h p_tT = const, (1)

ki dar on r — zichin moe, g — tezshavii ozodafti, h — balandii sathi moe, ki az hamvorii sarhisob (ufuqi) hisob karda shudaast,

r_gt — fishori statiki, -u- rv* — fishori dinamiki va pgh — fishori quvvai vaznini. Agar moe az gulbai ufuqii burishhoi arzii harkhela jori boshad, muvofiqi Muodilai Bernulli dar joyhoi tangi gulba surati moe balandtar, fishor khurdtar va bar­aks, dar joi vasei gulba fishori moe kalonu surat pasttar ast. Muodilai Bernulliro baroi halli masalahoi gidravlika (masalan., baroi hisob kardani miqdori moe yo gazi fishurdashu- _Dai dar vohidi vaqt az yagon burishi arzii gulba jorishavanda) istifoda mebarand. Baroi in bo yorii naychai Pito fishori mooro chen mekunand (rasm). Fishor dar naychai Pito r – Rst + R*>*/2     (2) ast. Agar

fishori statiki r_gg malum boshad, az muodilai (2) surati jorishavii moe (r)-ro yoftai mumkin ast. Muodilai Bernulli dar gidravlika, tekhnika va gidrodinamika ahamiyati kalon dorad.