Write the basic practical flow equation for a throttling device, and explain the meaning of each quantity in the equation
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Write the basic practical flow equation for a throttling device, and explain the meaning of each quantity in the equation
The basic practical flow equations are: Q=0.01252αξd2 (1) M=0.01252αξd2 (2) Where M represents the mass flow rate, in kg/h； Q — Volume flow rate under operating conditions, m3/h ； α——flow coefficient ； ξ——beam expansion coefficient ； d——Orifice diameter of the throttle element in operating condition, mm ； △p — pressure difference, Pa or KPa ； P1——Fluid density under operating conditions, Kg/m3 ； 0.01252=3600310-63 /42g =3600310-633.14/432*9.81
Basic practical flow equation: Q = 0.01252αεd^2(△p/ρ)^0.5; M = 0.01252αεd^2(△p/ρ)^0.5. Here, Q represents the volumetric flow rate under operating conditions, in m3/h； M — mass flow rate, kg/h ； α——flow coefficient ； ε——flux expansion coefficient ； d——Orifice diameter of the throttle element in operating condition, mm ； △p — pressure difference before and after the throttle element, in Pa or KPa ； ρ —— Fluid density under operating conditions, Kg/m3 ； 0.01252 = 3600×10^(-6)×3.14 /4×(2g)^0.5 = 3600×10^(-6)×3.14 /4×(2×9.81)^0.5
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