热管内超临界流体湍流的直接数值模拟

Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 2013-08-31 DOI:10.1615/tsfp8.770

H. Nemati, A. Patel, B. Boersma, R. Pecnik

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引用次数: 4

摘要

这项工作研究了流体接近其汽液临界点的管道流动中的湍流传热。在雷诺数Ret = 360的条件下，基于进口处的摩擦速度和管道直径，采用直接数值模拟(DNS)方法对非弹性Navier-Stokes方程进行了流场模拟。讨论了强制对流和混合对流两种情况下的湍流统计。由于流动加速度和浮力的影响，两种情况下的湍流动能都有所下降。此外，还观察到湍流热流通量与雷诺应力之间的相关性低于亚临界流动。

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DIRECT NUMERICAL SIMULATION OF TURBULENT FLOW WITH SUPERCRITICAL FLUID IN A HEATED PIPE

This work investigates turbulent heat transfer to a pipe flow with a fluid close to its vapour-liquid critical point. The flow is simulated using Direct Numerical Simulations (DNS) of the anelastic Navier-Stokes equations at a Reynolds number of Ret = 360, based on the friction velocity ut at the inlet and the diameter of the pipe. Turbulent statistics for two cases with forced and mixed convection are discussed. A decrease in turbulent kinetic energy is observed for both cases due to flow acceleration and buoyancy effects. Furthermore it is observed that the correlation between turbulent heat flux and Reynolds stresses is lower than in subcritical flows.

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Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena

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