含气泡水介质中的声传播  

On Propagation of Sound Wave in a Bubbly Liquid

作　　者：李福新[1] 孙进才[1] 黄景泉[1] 

机构地区：[1]西北工业大学

出　　处：《西北工业大学学报》1998年第2期241-245,共5页Journal of Northwestern Polytechnical University

摘　　要：基于Twersky理论，在计入气泡声吸收作用的同时，就气泡空间分布的相关性对含气泡水介质中声传播特性的影响进行了讨论。结果表阴：当考虑含气泡水介质中气泡空间分布的相关性时，声衰减系数的峰值后移且其峰值较忽略此相关性时的峰值低平；随着气泡体积分数的增大，气泡空间分布的相关性增强，气泡的谐振频率增大、谐振时的声散射幅值减小。Twersky et al[1] proposed the expressions for underwater propagation of sound wave in a bubbly liquid based on the index of refraction in correlated distributions of bubbles at large volume fraction. But only the simplffied model for the single bubble as a resonator without sound absorption (the thermal and viscous damping) was used in Twersky's expressions.We utilized Li's model[2] for a bubble in which the sound absorption was considered, and analyzed the characteristics of sound propagation in a bubbly liquid.We obtained Eqs. (13), (16) and (19) for talculating index of refraction.In Fte. 1, σs0 is the dissipation cross section. Values of σs0 for lines 1,2 were computed with eq. (16) when correlated distributions of bubbles were considered. Vaiues of σs0 for line 3 were computed when such correlated distributions were not considered. The comparison in Fig.1 shows the correlation of random distributions of bubbles cannot be neglected.In Fig. 3, two different large vaiues of volume ftaction are chosen: β=0. 01 (lines 3,4)and β=0. 03 (lines 1,2) ; also two cases with (lines 1,3) and without (lines 2,4) consideration of correlation of random distributions of bubbles are taken. In Fig. 3, the decrease in at tenuation coeffioient and the shift in resonance frequency of lines 1, 3 relative to lines 2,4 respectively are indicated as being quite appreciable.

关 键 词：含气泡水介质 声衰减系数 空间相关分布 声传播 

分 类 号：O427.1[理学—声学]