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首页> 外文期刊>The Journal of Chemical Physics >Sound-driven fluid dynamics in pressurized carbon dioxide
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Sound-driven fluid dynamics in pressurized carbon dioxide

机译：加压二氧化碳中的声音驱动流体动力学

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摘要

Using high-speed visualization we demonstrate that ultrasound irradiation of pressurized carbon dioxide (CO_2) induces phenomena that do not occur in ordinary liquids at ambient conditions. For a near-critical mixture of CO_2 and argon, sonication leads to extremely fast local phase separation, in which the system enters and leaves the two-phase region with the frequency of the imposed sound field. This phase transition can propagate with the speed of sound, but can also be located at fixed positions in the case of a standing sound wave. Sonication of a vapor-liquid interface creates a fine dispersion of liquid and vapor, irrespective whether the ultrasound horn is placed in the liquid or the vapor phase. In the absence of an interface, sonication of the liquid leads to ejection of a macroscopic vapor phase from the ultrasound horn with a velocity of several meters per second in the direction of wave propagation. The findings reported here potentially provide a tunable and noninvasive means for enhancing mass and heat transfer in high-pressure fluids.
机译：使用高速可视化，我们证明了加压二氧化碳（CO_2）的超声辐射会诱发在环境条件下普通液体中不会发生的现象。对于CO_2和氩气的近临界混合物，超声处理会导致极快的局部相分离，其中系统以施加的声场频率进入和离开两相区域。该相变可以声速传播，但是在驻波的情况下也可以位于固定位置。汽-液界面的超声处理会产生液体和蒸气的精细分散，而无论超声变幅杆是放置在液相还是在蒸气相中。在没有界面的情况下，液体的超声处理会导致超声波角在波传播方向上以每秒几米的速度喷射出宏观气相。此处报道的发现可能为提高高压流体的质量和热量传递提供了一种可调节且无创的手段。

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