Thermal-Mechanical Wave Propagation in Inviscid Non-Uniform Flow Confined by Heating Pipeline and Implications for Transit-Time Flow Meter

2013 ◽  
Vol 99 (4) ◽  
pp. 503-513 ◽  
Author(s):  
Yong Chen ◽  
Yiyong Huang ◽  
Xiaoqian Chen
Keyword(s):  
Wave Propagation ◽  
Transit Time ◽  
Uniform Flow ◽  
Mechanical Wave ◽  
Flow Meter ◽  
Time Flow

Numerical Simulation of Thermal Transit-Time Flow Meter for High Temperature, Corrosive and Irradiation Environment

2013 ◽  
Author(s):  
Elaheh Alidoosti ◽  
Jian Ma ◽  
Yingtao Jiang ◽  
Taleb Moazzeni
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Transit Time ◽  
Flow Rate ◽  
Normal Operation ◽  
Flow Meter ◽  
Thermal Signal ◽  
Time Flow ◽  
In Series ◽  
Measured Flow

In the environments of high temperature (>300 °C – 1000 °C), corrosive and even irradiation application, the challenges of providing reliable and accurate flow rate measurement is significant. In comparing with many other existing technologies for normal operation environments, correlated thermal transit-time flow meter show its advantages of resolving the challenges encountered in those harsh conditions. The correlated thermal signals can be detected by two separated thermal sensors (for example, thermocouples) in series alignment along the pipe, and derive the flow rate. It was evaluated to have accurate measurement for small pipe at slow fluid speed. In the higher flow rate and big pipe size application, this technology shows its weakness due to the limitations associated with slow response time of thermal sensor, dimension, and low strength of thermal signal. In this paper, we present a sophisticated layout of thermal transit-time flow meter with numerical simulation and experiments. By numerical results, we observed that the obtained flow in the bypass route is linearly proportional to the main flow over higher range of flows showing that the measured flow is successfully extended to high range and with stable and accurate measurement results.

scholarly journals A transit‐time flow meter for measuring milliliter per minute liquid flow

1988 ◽  
Vol 59 (2) ◽  
pp. 314-317 ◽  
Author(s):  
Canqian Yang ◽  
M. Kümmel ◽  
H. So/eberg
Keyword(s):  
Transit Time ◽  
Liquid Flow ◽  
Flow Meter ◽  
Time Flow

scholarly journals The application of intraoperative transit time flow measurement to accurately assess anastomotic quality in sequential vein grafting

2013 ◽  
Vol 17 (6) ◽  
pp. 938-943 ◽  
Author(s):  
Yang Yu ◽  
Fan Zhang ◽  
Ming-Xin Gao ◽  
Hai-Tao Li ◽  
Jing-Xing Li ◽  
...  
Keyword(s):  
Transit Time ◽  
Flow Measurement ◽  
Time Flow

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.

Ultrafast four-dimensional imaging of cardiac mechanical wave propagation with sparse optoacoustic sensing

2021 ◽  
Vol 118 (45) ◽  
pp. e2103979118
Author(s):  
Çağla Özsoy ◽  
Ali Özbek ◽  
Michael Reiss ◽  
Xosé Luís Deán-Ben ◽  
Daniel Razansky
Keyword(s):  
Wave Propagation ◽  
Cardiac Arrhythmias ◽  
Therapeutic Interventions ◽  
Model Organisms ◽  
Cardiac Mapping ◽  
Mechanical Wave ◽  
Heart Motion ◽  
Life Threatening ◽  
Phase Singularities ◽  
Small Model

Propagation of electromechanical waves in excitable heart muscles follows complex spatiotemporal patterns holding the key to understanding life-threatening arrhythmias and other cardiac conditions. Accurate volumetric mapping of cardiac wave propagation is currently hampered by fast heart motion, particularly in small model organisms. Here we demonstrate that ultrafast four-dimensional imaging of cardiac mechanical wave propagation in entire beating murine heart can be accomplished by sparse optoacoustic sensing with high contrast, ∼115-µm spatial and submillisecond temporal resolution. We extract accurate dispersion and phase velocity maps of the cardiac waves and reveal vortex-like patterns associated with mechanical phase singularities that occur during arrhythmic events induced via burst ventricular electric stimulation. The newly introduced cardiac mapping approach is a bold step toward deciphering the complex mechanisms underlying cardiac arrhythmias and enabling precise therapeutic interventions.

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