What conditions must the fluid meet when using a standard throttling device for flow measurement?
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What conditions must the fluid meet when using a standard throttling device for flow measurement?
①The fluid must fill the circular tubes and throttling devices, flowing continuously through the pipes； ②The fluid must be a Newtonian fluid ； ③No phase transition occurs when the fluid passes through the orifice ； ④The fluid flow rate does not change over time, or its change is extremely slow ； ⑤Before flowing through the throttle element, the fluid stream must be parallel to the pipe axis; there must be no rotational flow ； ⑥The fluid flow condition should be turbulent. The Reynolds number must be within a certain range, with no vortices.
(1) The circular tube and throttle element must be filled. (2) The fluid flow rate does not change over time, or its change is extremely slow.