The lines of zero angular momentum separate the flow into two areas of negative and two areas of positive angular momentum .
零角动量的曲线把物质的流动分成两个正角动量区和两个负角动量区。
Impeller-type flowmeter in the years of practical application, its working principle is relatively simple, general talk about is the principle of angular momentum of fluid flow measuring device.
多年来，叶轮式流量计在许多领域得到了较多的实际应用，其工作原理比较简单，概括的讲就是应用流体动量矩原理测量流量的装置。
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