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Interactions Inside a Coupled Oscillation System of Bubble-Viscous Liquid-Vessel and the Induced Stresses and Strains Within the Vessel Wall

Published online by Cambridge University Press:  05 May 2011

Yuantai Hu ,
Farong Gao ,
Hongping Hu  and
Chuanyao Chen
Yuantai Hu*
Affiliation:
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
Farong Gao*
Affiliation:
School of Civil Engineering and Mechanics & School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Hongping Hu*
Affiliation:
School of Civil Engineering and Mechanics & School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Chuanyao Chen*
Affiliation:
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
*
*Professor
**Postdoctoral Researcher
**Postdoctoral Researcher
**Postdoctoral Researcher
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Abstract

The evolution of a bubble confined inside a nonlinear micro vessel fully filled with a viscous liquid, subjected to a shock lithotripsy wave (SWL), is analyzed with a previously established asymmetrical model on bubble oscillation. Both the normal and shear stress components within the vessel wall are calculated. It is observed that although the shear stress induced by viscosity is far less than the normal stresses, hypertension patients are still at more risk than normal people in SWL because of the high blood pre-pressure and stiff vessel wall accompanying their high blood viscosity. Hence, safety of hypertensive patients with high blood viscosity must be taken into careful consideration in SWL. More detailed numerical results show that the increase of circumferential normal stress and strain in SWL is significantly larger than that of other stresses and strains. Large circumferential normal stress and strain are responsible for excessive dilation of vessel wall during asymmetrical oscillation of constrained bubbles, which implies that the vessel wall will rupture mainly in the form of a cleft along the vessel axial direction.

Keywords

Vessel wall stressViscous effectShock wave lithotripsyHypertension.
Type
Articles
Information
Journal of Mechanics , Volume 24 , Issue 1 , March 2008 , pp. 55 - 61
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2008

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