Electromagnetic flowmeter without a settling section

1986 ◽  
Vol 29 (1) ◽  
pp. 12-15
Author(s):  
I. D. Rubin
Keyword(s):  
Electromagnetic Flowmeter ◽  
Settling Section

Pattern of blood flow in the pulmonary veins of the dog

1965 ◽  
Vol 20 (6) ◽  
pp. 1118-1128 ◽  
Author(s):  
Eugene Morkin ◽  
John A. Collins ◽  
Harold S. Goldman ◽  
Alfred P. Fishman
Keyword(s):  
Blood Flow ◽  
Pulmonary Circulation ◽  
Pulmonary Veins ◽  
Electromagnetic Flowmeter ◽  
Sine Wave ◽  
Left Ventricular ◽  
Mean Flow ◽  
Venous Flow ◽  
Pulmonary Venous Flow ◽  
Atrial Contraction

The pattern of blood flow in the large pulmonary veins was studied in dogs by chronic implantation of sine-wave electromagnetic flowmeters and cineangiographic observations. These revealed that: 1) pulmonary venous flow is continuous and pulsatile with peak rate of flow of approximately twice the mean flow; 2) the initial rapid increase in venous flow occurs 0.10 sec after the onset of ventricular systole, reaching a peak at the time of closure of the A-V valves; 3) left atrial contraction produces a fleeting slowing or reversal of flow; and 4) respiratory variations in pulmonary venous flow follow those in pulmonary arterial flow, beat by beat. The genesis of phasic pulmonary venous flow was investigated by analysis of pressure and flow curves from the two sides of the heart, by consideration of the energy required for left ventricular filling, and by reconstruction of the pulmonary venous flow pulse using a mathematical model of the pulmonary circulation. These three lines of evidence are consistent in indicating that the transmitted right ventricular pressure is the major determinant of the pulmonary venous flow pattern in the dog. pulsatile pulmonary venous flow; pulmonary venous flow; pulmonary circulation; ventricular suction; respiration on pulmonary circulation; pulmonary venous angiography; pulmonary veno-atrial junctions; electromagnetic flowmeter; cineangiography Submitted on November 16, 1964

scholarly journals RESEARCH AND APPLICATION OF METHODS FOR CALCULATING THE MEASUREMENT UNCERTAINTY OF INDUSTRIAL FLOWMETERS

2020 ◽  
Vol 6 (444) ◽  
pp. 145-153
Author(s):  
S. G. Khan ◽  
◽  
L. K. Ibrayeva ◽  
N. V. Syabina ◽  
Z. M. Yuldashev ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Measurement Uncertainty ◽  
Relative Error ◽  
Electromagnetic Flowmeter ◽  
Standard Uncertainty ◽  
Practical Application ◽  
Labview Software ◽  
Complex Measurement ◽  
Measurement Equations ◽  
Mobile Complex

To create conditions for the recognition of Kazakhstani certificates of conformity and the results of product tests, an assessment of measurement uncertainty is required. In this regard, there has been an increase in the practical application in Kazakhstan of the concept of measurement uncertainty. The authors developed a physical stand for a mobile complex designed to verify electromagnetic flowmeters at the place of operation. To obtain verification results, programs were developed to calculate the uncertainty of an electromagnetic flowmeters using the NI LabView software. In addition, a model for estimating the uncertainty of the relative error of flowmeters was proposed, and the measurement uncertainty was estimated using three methods: standard, Monte Carlo and Kragten. Finally, a comparative analysis was conducted on the results of the estimation of the uncertainty of the relative error of the industrial electromagnetic flowmeter. All methods give standard uncertainty values that do not exceed the acceptable range of relative error (± 1%). However, Monte Carlo method gives better results for sufficiently large number of simulations. No significant differences between the results obtained using standard and Kragten methods were discovered. The Kragten method is preferable in the absence of the need to calculate the sensitivity coefficients when calculating the total standard uncertainty, which is important for complex measurement equations.

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