SHEN Zhuang-zhi, LIU Wen-qiang
(Institute of Applied Acoustics, Shaanxi Normal University, Shaanxi Institute of Physics; Key Laboratory of Ultrasonics of Shaanxi Province, Xi′an 710062, Shaanxi, China )
Abstract:
Using the bubble control equation, the motive behaviors of micro-bubble in acoustic standing wave field are numerically simulated with regarding water as a working medium. The effects of Bjerknes forces on bubble trajectory are investigated. Our results show that the coefficient of Bjerknes forces varies several orders of magnitude with different acoustic pressure values or different locations. During micro-bubble moving to the acoustic pressure antinode area, primary Bjerknes force increases at first and then decreases, but secondary Bjerknes force increases continuously. The interaction of them forms a ring around acoustic axis, and the greater acoustic pressure value will induce the greater ring.
KeyWords:
acoustic standing wave field; Bjerknes forces; micro-bubble cluster; ring
