Large-eddy simulation of fluid mixing in tee with sintered porous medium

Large-eddy simulation of fluid mixing in tee with sintered porous medium
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烧结多孔介质三通内流体混合的大涡模拟

DOI:
10.1007/s10483-012-1594-9
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发表时间:
2012-07
期刊:
Applied Mathematics and Mechanics (english Edition)
影响因子:
--
通讯作者:
Wang, Kui-sheng
Wang, Kui-sheng
中科院分区:
其他
文献类型:
--
作者:
Wang, Yong-wei;Lu, Tao;Jiang, Pei-xue;Cheng, Peng-fei;Wang, Kui-sheng

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利用FLUENT软件,采用大涡模拟(LES)湍流模型和带浮力的亚网格尺度(SGS) Smagorinsky-Lilly (SL)模型,模拟了带和不带烧结铜球的三通管内冷热流体的混合过程。通过对烧结铜球和未烧结铜球两种情况的数值计算结果进行比较,发现多孔介质可以有效地限制流体流动,增强传热,从而显著降低速度和温度波动。多孔介质明显增大了主风管的压降。多孔介质降低了1 ~ 10 Hz频率范围内温度波动的功率谱密度(PSD)。
Mixing processes of hot and cold fluids in a tee with and without sintered copper spheres are simulated by FLUENT using the large-eddy simulation (LES) turbulent flow model and the sub-grid scale (SGS) Smagorinsky-Lilly (SL) model with buoyancy. Comparisons of numerical results of the two cases with and without sintered copper spheres show that the porous medium significantly reduces velocity and temperature fluctuations because the porous medium can effectively restrict the fluid flow and enhance heat transfer. The porous medium obviously increases the pressure drop in the main duct. The porous medium reduces the power spectrum density (PSD) of temperature fluctuations in the frequency range from 1 Hz to 10 Hz.
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