Numerical Investigation of the Radial Behavior and Scattered Pressure from the Encapsulated Microbubble in Vicinity of the Boundaries with Different Elasticities

Document Type : Original Article

Authors

1 department of mechanical engineering, shahid rajaee theacher training university

2 shahid rajaee teacher training university

Abstract

One of the best methods for improving quality and clarity of the ultrasound imaging is the use of coated bubbles. In this paper, the dynamics of an encapsulated bubble near the wall is simulated with different elasticity for the ultrasound imaging. For this purpose, a computer program has been developed in MATLAB software, in which the modified Rayleight-Plesset differential equation is solved numerically using by the fourth-order Runge Kutta method. Initially, the results were compared with experimental data, then the radial behavior of the encapsulated bubble (UCA) was investigated for two adjacent states with rigid and elastic wall and the scattered pressure from the bubble was simulated. In addition, the effect of the shell viscosity (Ks), the initial radius of the bubble and the distance between the bubble and the wall on the dynamic behavior of the bubble and the amount of scattered pressure therefrom are investigated. The results are presented in the form of table and graphs. The results show that the bubble shell's viscosity and the initial bubble radius have a significant effect on the bubble dynamics. Finally, the frequency response of the encapsulated bubble has been investigated and the effect of the initial radius of the bubble, the shell material and the elastic modulus of the wall on the strength of the fundamental spectrum has been presented. The results show that by increasing the elastic modulus of the wall, the strength of the fundamental spectrum reach the limit state and does not change.

Keywords

References

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History

  • Receive Date: 28 May 2019
  • Revise Date: 03 March 2020
  • Accept Date: 23 June 2020
  • Publish Date: 20 February 2020

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