The effect of bulk viscosity on temperature relaxation near the critical point
The effect of bulk viscosity on temperature relaxation near the critical point
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DOI：
10.1063/1.869738
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发表时间：
1998-10
影响因子：
4.6
通讯作者：
P. Carlès
中科院分区：
文献类型：
--
作者：
P. Carlès
临界点附近的热传递不仅受扩散、对流和辐射的影响，还受称为活塞效应的热力耦合的影响。这第四种传热模式是所谓的临界加速的原因，这与热扩散临界减慢的第一种预期相矛盾。在现有的活塞效应理论模型中，粘性都被忽略了。本文的目的是提出一个全面的模型的活塞效应，写一个真实的流体状态方程，包括临界发散的体积粘度。特别是，当临界点接近时，传热速度越来越快，直到达到粘性应力不再可以忽略不计的点。当接近临界点时，热传递再次减慢;进入临界减慢状态。这种现象应该发生在离临界温度足够远的地方。
The heat transfer near the critical point is governed not only by diffusion, convection, and radiation, but also by a thermomechanical coupling called the Piston Effect. This fourth mode of heat transfer is responsible for the so-called critical speeding up, which contradicts the first expectation of a critical slowing down of the heat diffusion. So far, the viscosity has been neglected in all the existing theoretical models of the Piston Effect. The aim of this paper is to present a comprehensive model of the Piston Effect, written for a real-fluid equation of state and including the critical divergence of the bulk viscosity. It is shown in particular that when the critical point is neared, the heat transfer goes faster and faster, until a point is reached where viscous stresses are no longer negligible. When going closer to the critical point, the heat transfer then slows down again; a regime of critical slowing down is entered. This phenomenon should happen sufficiently far from the critical temperatur...