层流声射流的现象学研究
Phenomenology of laminar acoustic streaming jets
AI总结：
本研究通过含衰减效应的新型声力建模开展数值模拟，揭示Eckart声流射流各区域的物理机制，推导轴线速度标度律，为相关实验及工业装置设计提供依据。
摘要：
本研究通过数值模拟，识别了Eckart声流射流沿程不同流动区域的物理机制，模拟基于包含衰减效应的驱动声力新型建模方法。流动由轴对称行声波束驱动，声波在射流受限的封闭圆柱容器的大部分区域内发生衰减。研究聚焦于稳态、轴对称层流状态。该射流通常在靠近声源处呈现强加速，随后达到速度峰值。在距换能器更远的位置，射流轴线上的速度在到达对壁前平滑衰减。针对射流沿程的每个流动区域，我们推导了轴线速度随声力大小和驱动声束衍射变化的标度律。这些标度律揭示了射流沿程的不同流动状态，清晰呈现了其空间结构，可为涉及Eckart流射流的实验或工业装置设计提供参考。
英文摘要：
This work identifies the physical mechanisms at play in the different flow regions along an Eckart acoustic streaming jet by means of numerical simulation based on a novel modeling of the driving acoustic force including attenuation effects. The flow is forced by an axisymmetric beam of progressive sound waves attenuating over a significant part of a closed cylindrical vessel where the jet is confined. We focus on the steady, axisymmetric and laminar regime. The jet typically displays a strong acceleration close to the source before reaching a peak velocity. At further distances from the transducer, the on-axis jet velocity smoothly decays before reaching the opposite wall. For each of these flow regions along the jet, we derive scaling laws for the on-axis velocity with the magnitude of the acoustic force and the diffraction of the driving acoustic beam. These laws highlight the different flow regimes along the jet and establish a clear picture of its spatial structure, able to inform the design of experimental or industrial setups involving Eckart streaming jets.
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