Experimental study for liquid nitrogen flow in balanced orifice plate
he balanced orifice plate,the main part of multi-orifice throttle meter,has significant advantages in the cryo-genic liquid flow measurement.This article built a vacuum visualization experimental platform,the flow pattern inside a horizon-tal tube was observed by a high-speed camera using liquid nitrogen as the working fluid,and the flow characteristics were ana-lyzed in the balanced orificeplate.The results indicate that after liquid nitrogen flow into the normal temperature pipe,the flow pattern presents single nitrogen flow(include at normal temperature and at cryogenic temperature),gas-liquid stratified flow,wavy flow,slug flow and single liquid nitrogen flow.The discharge coefficient of the balanced orifice plate was obtained by liquid nitrogen flow,and maintains stability within the flow measurement range.The permanent pressure drop produced by liquid nitro-gen flow through the balanced orifice plate increases as the velocity increases,and it presents a good parabolic relationship.
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