Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1997-09-30
J. Acoust. Soc. Am. 102, 1223 (1997)
Physics
Condensed Matter
Soft Condensed Matter
19 pages, 10 low resolution ps-figures; higher resolution figures can be retrieved from http://staff-www.uni-marburg.de/~hilge
Scientific paper
10.1121/1.419936
The sound radiation of 3 MHz acoustically driven air bubbles in liquid is analysed with respect to possible applications in second harmonic ultrasound diagnostics devices, which have recently come into clinical use. In the forcing pressure amplitude P_a = 1-10 atm and ambient radius R_0 = 0.5-5 \mu m parameter domain a narrow regime around the resonance radius R_0 \sim 1-1.5 \mu m and relatively modest P_a \sim 2-2.5 atm is identified in which optimal sound yield in the second harmonic is achieved while maintaining spherical stability of the bubble. For smaller P_a and larger R_0 hardly any sound is radiated; for larger P_a bubbles become unstable towards non-spherical shape oscillations of their surface. The computation of these instabilities is essential for the evaluation of the optimal parameter regime. A region of slightly smaller R_0 and P_a \sim 1-3 atm is best suited to achieve large ratios of the second harmonic to the fundamental intensity. Spherical stability is guaranteed in the suggested regimes for liquids with an enhanced viscosity compared to water, such as blood.
Grossmann Siegfried
Hilgenfeldt Sascha
Lohse Detlef
Zomack Michael
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