Georgia Institute of Technology, Atlanta, GA 30332, USA.
J Acoust Soc Am. 2011 Aug;130(2):826-34. doi: 10.1121/1.3605563.
A multi-scale homogenization technique and a finite element-based solution procedure are employed to compute acoustic absorption in smooth and rough packed microtubes. The absorption considered arises from thermo-viscous interactions between the fluid media and the microtube walls. The homogenization technique requires geometric periodicity, which for smooth tubes is invoked using the periodicity of the finite element mesh; for rough microtubes, the periodicity invoked is that associated with the roughness. Analysis of the packed configurations, for the specific microtube radii considered, demonstrates that surface roughness does not appreciably increase the overall absorption, but instead shifts the peaks and values of the absorption curve. Additionally, the effect of the fluid media temperature on acoustic absorption is also explored. The results of the investigation are used to make conclusions about tailored design of acoustically absorbing microtube-based materials.
采用多尺度均匀化技术和基于有限元的求解程序来计算光滑和粗糙填充微管中的声波吸收。所考虑的吸收来自于流体介质与微管壁之间的热粘相互作用。均匀化技术需要几何周期性，对于光滑管，这是通过有限元网格的周期性来实现的；对于粗糙微管，所采用的周期性与粗糙度有关。针对所考虑的特定微管半径的填充结构的分析表明，表面粗糙度不会显著增加整体吸收，而是会改变吸收曲线的峰值和值。此外，还探讨了流体介质温度对声波吸收的影响。研究结果用于得出关于基于吸声微管的材料的定制设计的结论。
