Abstract
A series of experiments involving microbubbles in narrow tubes is presented. The threshold for bubble collapse has been investigated as a function of the applied pressure and tube diameter. The threshold has been found to be dependent not only on the applied pressure amplitude but also on the tube size with an increase for smaller tubes. The data have been interpreted in terms of a simple damped harmonic oscillator model. The motivation of this study lies in the possibility of obtaining a better understanding of microbubble behavior in blood vessels in order to optimize applications of microbubbles in medical ultrasound.
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