Thermoacoustic waves along the critical isochore.
Thermoacoustic waves along the critical isochore.
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DOI：
10.1103/physreve.83.011115
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发表时间：
2011-01
期刊：
影响因子：
--
通讯作者：
B. Shen;P. Zhang
中科院分区：
文献类型：
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作者：
B. Shen;P. Zhang
在液-气临界点附近，热扰动会产生声音。我们研究了在线性和非线性温度扰动下，沿着临界等容线40年约化温度[定义为τ =（T-T（c））/T（c），T（c）为临界温度]的声发射。我们通过数值求解控制方程来识别各种热声行为。结果表明，一个均匀的热声波图案占主导地位的线性情况下，在很大程度上独立于的非线性扰动，而在非线性扰动下，的变化可能会导致严重的波前变形。强非线性效应被发现是一个短暂的性质，因为在适当的时候，这两种情况下往往收敛的绝热过程的能量产率。
Near the liquid-gas critical point, thermal disturbances can generate sounds. We study the acoustic emission over four decades of reduced temperatures [defined as ɛ=(T-T(c))/T(c), with T(c) the critical temperature] along the critical isochore, under linear and nonlinear temperature perturbations, respectively. We identify various thermoacoustic behaviors by numerically solving the governing equations. It is shown that a homogeneous thermoacoustic-wave pattern dominates in the linear case, largely independent of ɛ; whereas under the nonlinear perturbation, variation in ɛ could lead to severe wavefront deformation. The strong nonlinear effect is found to be of a transient nature because, in due time, both cases tend to converge in terms of the energy yield of the adiabatic process.