The evolution of acoustic Lichtenberg figure (ALF) in ultrasound fields is studied using high-speed photography. It is observed that bubbles travel along the branch to the aggregation region of an ALF, promoting the possibility of large bubble or small cluster formation. Large bubbles move away from the aggregation region while surrounding bubbles are attracted into this structure, and a bubble transportation cycle arises in the cavitation field. A simplified model consisting of a spherical cluster and a chain of bubbles is developed to explain this phenomenon. The interaction of the two units is analyzed using a modified expression for the secondary Bjerknes force in this system. The model reveals that clusters can attract bubbles on the chain within a distance of 2 mm, leading to a bubble transportation process from the chain to the bubble cluster. Many factors can affect this process, including the acoustic pressure, frequency, bubble density, and separation distance. The larger the bubble in the cluster, the broader the attraction region. Therefore, the presence of large bubbles might enhance the process in this system. Local disturbances in bubble density could destroy the ALF structure. The predictions of the model are in good agreement with the experimental phenomena.

使用高速摄影研究超声领域中声学 Lichtenberg 图 (ALF) 的演变。观察到气泡沿着分支行进到 ALF 的聚集区域，促进了大气泡或小簇形成的可能性。大气泡离开聚集区，而周围的气泡被吸引到该结构中，在空化场中出现气泡传输循环。开发了一个由球形簇和一串气泡组成的简化模型来解释这种现象。使用该系统中次级 Bjerknes 力的修正表达式分析两个单元的相互作用。该模型显示，簇可以在 2 毫米的距离内吸引链条上的气泡，导致从链到气泡簇的气泡传输过程。许多因素会影响这一过程，包括声压、频率、气泡密度和分离距离。集群中的气泡越大，吸引区域越广。因此，大气泡的存在可能会增强该系统中的过程。气泡密度的局部扰动会破坏 ALF 结构。模型的预测与实验现象吻合良好。气泡密度的局部扰动会破坏 ALF 结构。模型的预测与实验现象吻合良好。气泡密度的局部扰动会破坏 ALF 结构。模型的预测与实验现象吻合良好。