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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CO_2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。
The fluid re-establishment of the thermal balance near the critical point of the gas-liquid greatly shortens the time, which mainly depends on the accelerating effect of the “piston effect” on the energy transport. It is essentially a thermo-acoustic wave action. In this paper, starting from the basic control equations, the momentum and energy transport processes in the supercritical CO 2 on the acoustic time scale are numerically solved by the governing equations of fluid dynamics. The results show that the spatial distribution of the fluid temperature does not follow the classical Fourier thermal conductivity Model, whose evolution over time shows obvious fluctuations.