流体在气液临界点附近热平衡重新建立的时间大大缩短,这主要依赖于“活塞效应”对能量输运的加速作用,它本质上是一种热声波动作用。本文从基本控制方程组出发,通过数值求解流体动力学控制方程组,对声学时间尺度上超临界CO2中的动量和能量输运过程展开研究,结果表明流体温度空间分布不遵循经典傅里叶导热模型,其随时间的演化过程呈现明显波动特性。
Thermal homogenization is significantly accelerated near the critical point because of the so-called piston effect. In essence, the piston effect is a thermomechanical effect. We study the momentum and energy transport in supercritical CO2 by numerically solving the governing hydrodynamic equations. The results show explicitly the thermoacoustic nature of the process, which patently deviates from what the classical Fourier conduction model predicts.
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