04-special tools

在流體力學, 流體流經障礙物(閥件, 管件, 流量計)必有壓降, 且與流量有關.

前人利用此理, 設計出各式流量計.

以細腰流量計(Venturi meter)為例:

根據白努力方程式: △P/ρ + △U2 / 2 = 0

U22 – U12 = - 2△P/ρ, U2, U1 分別為在管徑D2, D1處之流速.

以β = D2/D1, 則U2 = √[2(-△P/ρ)/(1 –β4)]

經校正, 流量 Q = (π/4) Dv2 Cv √[2(-△P/ρ)/(1 –β4)]--- Dv為Venturi 直徑

 

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