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A New Differential Pressure Flow Meter for Measurement of Human Breath Flow: Simulation and Experimental Investigation

机译：新型测量人体呼吸流量的差压流量计：仿真与实验研究

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摘要

The development and performance characterization of a new differential pressure-based flow meter for human breath measurements is presented in this article. The device, called a “Confined Pitot Tube,” is comprised of a pipe with an elliptically shaped expansion cavity located in the pipe center, and an elliptical disk inside the expansion cavity. The elliptical disk, named Pitot Tube, is exchangeable, and has different diameters, which are smaller than the diameter of the elliptical cavity. The gap between the disk and the cavity allows the flow of human breath to pass through. The disk causes an obstruction in the flow inside the pipe, but the elliptical cavity provides an expansion for the flow to circulate around the disk, decreasing the overall flow resistance. We characterize the new sensor flow experimentally and theoretically, using Comsol Multiphysics® software with laminar and turbulent models. We also validate the sensor, using inhalation and exhalation tests and a reference method.
机译：本文介绍了一种新的基于压差的人体呼吸测量流量计的开发和性能表征。该设备称为“受限皮托管”，由一个在管道中心具有椭圆形膨胀腔的管道和一个在膨胀腔内部的椭圆盘组成。椭圆盘（称为皮托管）可以互换，并且直径不同，小于椭圆腔的直径。盘和腔之间的间隙允许人的呼吸通过。圆盘在管道内部造成了阻塞，但是椭圆形的腔体为圆盘周围的流动提供了膨胀，从而减小了总的流动阻力。我们使用带有层流模型和湍流模型的Comsol Multiphysics ®软件在实验和理论上对新传感器的流量进行表征。我们还使用吸气和呼气测试以及参考方法来验证传感器。

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