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超临界点附近二氧化碳流体的声速

罗奔毅 卢义刚

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超临界点附近二氧化碳流体的声速

罗奔毅, 卢义刚

Study of sound speed in near-critical carbon dioxide

Luo Ben-Yi, Lu Yi-Gang
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  • 使用压缩蒸气模型,推导了超临界流体在超临界点附近区间的声速表达式,表达式揭示了声速和密度波动指数、等温压缩系数、定体摩尔热容量等参量的联系.在超临界点附近,二氧化碳流体的声速和密度波动指数呈减函数关系,密度波动指数越大,声速越小,在密度波动指数最小处,声速最大,此时,较小的密度波动会引起较大的声速波动.当压强逐渐增大并接近临界点时,定体热摩尔容量的迅速增大导致声速减小,当压强增大而远离临界点时,定体摩尔热容量的迅速减小导致声速增大.由表达式得到的计算值与由美国国家标准局提供的参考值符合较好.
    Based on the condensing vapor model, the expression of sound speed close to critical point is deduced,which shows the relationship between the sound speed and the density fluctuating index and thermal capacity at constant volume. Close to critical point, the sound speed of liquid carbon dioxide is inversely proportional to the density fluctuation index. The bigger the density fluctuation index, the smaller the sound speed. The sound speed is maximal at minimal density fluctuation index, where small fluctuations of density induces large fluctuations of sound speed. When the pressure increases and approaches to critical point, the rapid increase of thermal capacity induces decrease of sound speed. When the pressure increases and departs from critical point, the rapid decrease of thermal capacity at constant volume induces increase of sound speed. The calculated values of sound speed from the expression are in good agreement with the reference values from NIST.
    • 基金项目: 国家自然科学基金(批准号:10674048),广东省自然科学基金(批准号:06025714)和广东省科技计划(批准号:2007B031402003)资助的课题.
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  • 文章访问数:  9206
  • PDF下载量:  713
  • 被引次数: 0
出版历程
  • 收稿日期:  2007-04-19
  • 修回日期:  2007-05-14
  • 刊出日期:  2008-07-20

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