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Effect of Tube Ovalling on Pressure Wave Propagation Speed
- Source :
- Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine. 204:245-251
- Publication Year :
- 1990
- Publisher :
- SAGE Publications, 1990.
-
Abstract
- For physiological and other flows it is often assumed that the pressure pulse wave speed is given by the classic Moens-Korteweg expression and this may be used, for example, to assist in the determination of in vivo blood vessel wall incremental Young's modulus. A number of physical factors affecting the value of this wave speed have been reviewed in the literature, but the effect of slight ovalling of the tube cross-section is rarely mentioned. The analysis for a tube of elliptic cross-section shows that even a very small degree of ovalling can cause quite substantial reductions in Young mode wave propagation velocities compared with the classic Moens-Korteweg expression. Bending-induced changes in cross-section shape with internal pressure increase the apparent elasticity of the tube wall. Experimental confirmation is provided by waterhammer wave speed measurements in a copper tube that has been ovalled by coiling. Even though the Young mode is not dominant in this case, as it would be for a physiological case, the measured wave speed is quite clearly less than the Moens-Korteweg theory and it can be shown that the small degree of measured tube ovality explains this.
- Subjects :
- Physics
030222 orthopedics
Ground wave propagation
Wave propagation
Mechanical Engineering
0206 medical engineering
Hemodynamics
Models, Cardiovascular
Modulus
Internal pressure
02 engineering and technology
General Medicine
Mechanics
020601 biomedical engineering
Elasticity
Pulse pressure
03 medical and health sciences
0302 clinical medicine
Surface wave
Ovality
Pressure
Stress, Mechanical
Elasticity (economics)
Blood Flow Velocity
Subjects
Details
- ISSN :
- 20413033 and 09544119
- Volume :
- 204
- Database :
- OpenAIRE
- Journal :
- Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
- Accession number :
- edsair.doi.dedup.....db8f4d2afd532e39b7fd7552fcc1ec83