Elliott S E, Shore J H, Barnes C W, Lindauer J, Osborn J J
J Appl Physiol Respir Environ Exerc Physiol. 1977 Mar;42(3):456-60. doi: 10.1152/jappl.1977.42.3.456.
A new type of flowmeter is described which operates on the principle that pressure drop (deltaP) produced by turbulent volume flow (V) through a simple resistance chamber obeys a relation of V = K (deltaP)0.50. Data are given showing that the device follows a true power law with a single exponent for airflows ranging from 3.5 to 270 l/min. Standard instrumentation and a linearization circuit are used with the new flowmeter to provide linear steady-state and alternating airflow measurements up to peak rates of 150 l/min and frequency to 15 Hz. Data are presented comparing integrated airflow readings from the new turbulent flowmeter and a laminar-type flowmeter. The turbulent airflow meter appears to offer increased reliability for long-term patient monitoring use in patient-ventilator circuits.
本文描述了一种新型流量计，其工作原理是：通过一个简单的阻力腔的湍流体积流量（V）所产生的压降（ΔP）遵循V = K（ΔP）^0.50的关系。给出的数据表明，该装置对于3.5至270升/分钟的气流遵循具有单一指数的真功率定律。新型流量计与标准仪器和线性化电路一起使用，可提供高达150升/分钟峰值速率和15赫兹频率的线性稳态和交变气流测量。文中给出了比较新型湍流流量计和层流型流量计的综合气流读数的数据。对于患者-呼吸机回路中的长期患者监测应用，湍流气流计似乎具有更高的可靠性。
