scholarly journals Analysis of flow characteristics and flow measurement accuracy of elbow under different conditions

2018 ◽  
Vol 128 ◽  
pp. 012070
Author(s):  
Songsong Zhang ◽  
Baohuan Su ◽  
Jianmin Liu ◽  
Xuemin Liu ◽  
Guoli Qi ◽  
...  
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Flow Characteristics

scholarly journals Analysis of flow characteristics and flow measurement accuracy of elbow with different diameters

2018 ◽  
Vol 113 ◽  
pp. 012231
Author(s):  
Songsong Zhang ◽  
Baohuan Su ◽  
Jianmin Liu ◽  
Xuemin Liu ◽  
Guoli Qi ◽  
...  
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Flow Characteristics ◽  
Different Diameters

Structured methods for improving flow measurement accuracy in pipelines

2020 ◽  
pp. 30-35
Author(s):  
Gurami N. Akhobadze
Keyword(s):  
Flow Measurement ◽  
Measurement Accuracy ◽  
Directional Coupler ◽  
Signal To Noise Ratio ◽  
Scattered Wave ◽  
Orthogonal Polarization ◽  
Flow Sensors ◽  
Information Signal ◽  
Mass Flows ◽  
Processing Device

In the age of digital transformation of production processes in industry and science the development and design of intelligent flow sensors for granular and liquid substances transferring through pipelines becomes more important. With this in view new approaches for improving the accuracy of microwave flowmeters are proposed. Taking into account the characteristics ofelectromagnetic waves propagating through a pipeline, a wave scattered by inhomogeneities of the controlled medium is analyzed. Features of the transformation of the polarized scattered wave limiting the geometric dimensions of the pipeline and optimizing the values of the useful scattered signal are revealed. Expediency of collection of the information signal with orthogonal polarization of the scattered wave and through a directional coupler is substantiated. The method of estimating the measurement accuracy with reference to the signal-to-noise ratio at the input of the processing device is given. The research results can be used in cryogenic machine engineering to measure volume and mass flows of liquid cryogenic products.

Roles of Transit-Time Flow Measurement for Coronary Artery Bypass Surgery

2018 ◽  
Vol 66 (06) ◽  
pp. 426-433 ◽  
Author(s):  
Yasushi Takagi ◽  
Yoshiyuki Takami
Keyword(s):  
Coronary Artery ◽  
Coronary Artery Bypass ◽  
Transit Time ◽  
Graft Failure ◽  
Flow Measurement ◽  
Coronary Artery Bypass Surgery ◽  
Coronary Circulation ◽  
Artery Bypass ◽  
Flow Characteristics ◽  
Time Flow

AbstractTransit-time flow measurement (TTFM) has been increasingly applied to detect graft failure during coronary artery bypass grafting (CABG), because TTFM is less invasive, more reproducible, and less time consuming. Many authors have attempted to validate TTFM and to gain the clear cutoff values and algorithm in TTFM to predict graft failure. The TTFM technology has also been shown to be a useful tool to investigate CABG graft flow characteristics and coronary circulation physiology. It is important to recognize the practical roles of TTFM in the cardiac operating room by review and summarize the literatures.

A Numerical Study on Flow Characteristics Through Orifice Flowmeter and Measurement Accuracy Depending on Upstream Straight Length

2017 ◽  
Author(s):  
Jang Il Lee ◽  
Ae Ju Cheong ◽  
Bok Ki Min
Keyword(s):  
Numerical Analysis ◽  
Measurement Accuracy ◽  
Performance Test ◽  
Swirling Flow ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Orifice Plate ◽  
3 Dimensional ◽  
Ansys Cfx ◽  
Axial Velocity Profile

In this numerical study, Commercial CFD (Computational Fluid Dynamics) code, ANSYS CFX ver. 17.1, is used to analyze the 3-Dimensional flow characteristics through orifice plate (β = 0.6) with two 90 degree bends in different planes. The purpose of this numerical study is to evaluate measurement accuracy and flow characteristics of orifice flowmeter depending on upstream straight length from 12D to 56D. Thus, numerical calculations of pressure drop caused by swirling flow and distortion of axial velocity profile on orifice plate are performed by using numerical analysis. In addition, numerical analysis results are compared with recommended upstream straight length of ASME Performance Test Codes 19.5 for orifice plates and nozzles. The results show that if upstream straight length of orifice flowmeter is more than 40D, there is a little deviation of differential pressure. Moreover, it is found that up-down asymmetry of recirculation zones is relatively attenuated as the upstream straight length increases.

Umbilical venous blood flow measurement: accuracy and reproducibility

2008 ◽  
Vol 32 (4) ◽  
pp. 587-591 ◽  
Author(s):  
F. Figueras ◽  
S. Fernández ◽  
E. Hernández-Andrade ◽  
E. Gratacós
Keyword(s):  
Blood Flow ◽  
Flow Measurement ◽  
Measurement Accuracy ◽  
Venous Blood ◽  
Venous Blood Flow ◽  
Blood Flow Measurement

Effect of the Bed Sand Wave on Cross-Section Discharge Measurement and Calculation in Physical Model

2013 ◽  
Vol 405-408 ◽  
pp. 2072-2076
Author(s):  
Qiang Wan ◽  
Yong Tao Cao
Keyword(s):  
Physical Model ◽  
Cross Section ◽  
Flow Measurement ◽  
Measurement Accuracy ◽  
Correction Method ◽  
Sand Wave ◽  
Discharge Measurement ◽  
Sand Ripple ◽  
River Bed ◽  
Bed Form

t is analyzed of the effect of the bed form change on the cross section flow measurement and calculation in the flume with the sand ripple bed or smooth bed. The reason is researched that the flow measurement error is caused by the river bed ripple. The Correction method is analyzed under the condition of different discharge and riverbed morphology. So the support is provided in order to improve the physical model discharge measurement accuracy.

Design on Flow Measurement Solution with Intelligent Efflux Coefficient Standard Throttling Gear

2013 ◽  
Vol 325-326 ◽  
pp. 783-786
Author(s):  
Quan Sheng Duan ◽  
Qing Zhao ◽  
Li Cui Wang
Keyword(s):  
Lower Limit ◽  
Flow Measurement ◽  
Measurement Accuracy ◽  
Intelligent System ◽  
Design Method ◽  
Pressure Gauge ◽  
Measurement Range ◽  
Differential Pressure ◽  
National Standards

t is an in-depth research on the span measurement range ratio that standard throttling gear measures the flow is too small, and proposes the design method of multi-efflux coefficient standard throttling gear. Expanding the lower limit of measurable flow according to the relevant national standards GB/T2624-2006. Solution divides the span measurement range into several segments, each piece span measurement range corresponds to a differential pressure gauge, and calculates corresponding efflux coefficient depending on the GB/T2624-2006 to get many outflow coefficients on the different span measurement sub-range section. Intelligent system chooses corresponding efflux coefficients based on different differential pressure, and ensures measurement accuracy at the same time of expanding the lower limit.

Sign in / Sign up

Export Citation Format

Share Document