音場中の球形気泡が放出する第2高調波音の摂動解析(流体工学,流体機械)

概要

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A second harmonic sound pressure emitted from a micro-bubble, which is used as contrast agent for ultrasound imaging, in an acoustic field is theoretically studied. A thermal damping effect of the bubble oscillation is taken into account. An acoustic pressure amplitude "(⊿P_L)" is assumed to be sufficiently smaller than a surrounding pressure "P_<L0>" and a weak non-linearity of the bubble motion is analyzed. Governing equations are perturbed up to O((⊿P_L)^2/P^2_<L0>). From O((⊿P_L)/P_<L0>) and O((⊿P_L)^2/P^2_<L0>) solutions, algebraic correlation equation of the second harmonic sound is derived. The numerical simulation is also performed. The simulation results show good agreement with the present correlation equation in the case of (⊿P_L)/P_<L0>≪1. The limitation of the present theory is discussed at the higher (⊿P_L).
一般社団法人日本機械学会の論文
2004-11-25