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Title: Thermal Effects On Critical Flow Venturis
Author: John D.Wright Woong Kang Liang Zhang Aaron N.Johnson
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: Critical flow venturis (CFVs) are widely used as working and transfer standards for gas flow measurement because of their long - term calibration stability ( 0.06 %) and well developed physical model. At Reynolds numbers Re 2.5 x 10 5 ( e.g. , a 2 mm throat diameter flowing air at 1 MPa), CFVs exhibit sensitivity to the environmental temperature of approximately 200 parts in 10 6 / K, primarily due to the difficulty of measuring the temperature of the gas entering the CFV (temperature sampling errors) and thermal boundary layer effects. For example, during the CCM.FF - K6 2002 key comparison 2, the temperature sensitivity of the CFV transfer standard accounted for as much as 40 % of the transfer standard uncertainty

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