# what's relationship between flow rate and speed

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 April 4, 2005, 20:29 what's relationship between flow rate and speed #1 wanghong Guest   Posts: n/a Hi everybody. i am simulating a species problem.i know when gas flow rate of the nozzle is a constant,a small diameter will make gas flow faster,but what's relationship between the speed and diameter and nozzle's flow rate? Thanks for all!!

 April 4, 2005, 23:11 Re: what's relationship between flow rate and spee #2 pUl| Guest   Posts: n/a Equation of continuity? v1 * rho1 * A1 = v2 * rho2 * A2 Where: v = velocity/speed (m/s) rho = density (Kg/m^3) A = cross sectional area (m^2) Assuming rho is constant: v1 * A1 = v2 * A2 => Flow rate = v * A = constant => if 'd' decreases (because A = pi() * d^2 / 4 => A also decreases) then v increases to keep v * A = constant. Best Regards, Srinath Madhavan

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