Influence of the particle diameter and porosity of packed porous media on the mixing of hot and cold fluids in a T-junction
Influence of the particle diameter and porosity of packed porous media on the mixing of hot and cold fluids in a T-junction
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填充多孔介质的粒径和孔隙率对 T 形接头中冷热流体混合的影响
DOI：
10.1016/j.ijheatmasstransfer.2015.01.036
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发表时间：
2015-05
影响因子：
5.2
通讯作者：
Lu T.
中科院分区：
文献类型：
--
作者：
Wang Y. W.;Lu T.
采用亚网格尺度Smagorinsky-Lilly模型，采用大涡模拟（LES）方法，对填充球形颗粒的T型管中冷热流体混合时的流动与换热进行了数值研究。计算结果表明，归一化时均温度和归一化均方根温度与实验值吻合较好。对三种不同粒径和孔隙率的多孔结构进行了数值模拟，以评估粒径和孔隙率对温度和速度波动的影响。结果表明，随着颗粒粒径的增大和多孔介质孔隙率的减小，速度和温度的波动逐渐减小。随着颗粒直径从26 mm增加到30 mm，并且孔隙率从0.4降低到0.2，压降急剧增加（增加到10.8倍）。随着颗粒粒径的增大和孔隙率的减小，颗粒的惯性阻力和粘性阻力增大，有效导热系数增大，湍流混合减弱。
Fluid flow and heat transfer when cold and hot fluids mix in a T-junction packed with spherical particles have been numerically investigated using large eddy simulations (LES) with the sub-grid scale Smagorinsky–Lilly model. The numerical results of both normalized time-averaged temperature and normalized root mean square temperature were found to be in good agreement with experimental data. Numerical simulations of three porous structures with different particle diameters and porosity were completed, in order to evaluate the effect of particle diameter and porosity on fluctuations in temperature and velocity. The results indicate that the velocity and temperature fluctuations decrease gradually with increasing particle diameter and decreasing porosity of the porous medium. The pressure drop increases sharply (by a factor of ∼8) as the particle diameter increases from 26 mm to 30 mm and the porosity decreases from 0.4 to 0.2. That are caused stronger inertial resistance and viscous resistance, the effective thermal conductivity increase and the turbulent mixing weakened as the particle diameter increases and the porosity decreases.
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影响因子：
1.9
作者：
Yong-wei Wang;T. Lu;Kuisheng Wang
通讯作者：
Yong-wei Wang;T. Lu;Kuisheng Wang
带/不带多孔介质的混合三通中温度波动的大涡模拟 (LES)
DOI：
10.1016/j.ijheatmasstransfer.2010.07.001
发表时间：
2010-10
影响因子：
5.2
作者：
Lu, T.;Jiang, P. X.;Guo, Z. J.;Zhang, Y. W.;Li, H.
通讯作者：
Li, H.
DOI：
10.5065/d67h1ggq
发表时间：
1966
期刊：
--
影响因子：
--
作者：
K. Lilly
通讯作者：
K. Lilly
影响因子：
5.2
作者：
M. Quintard;S. Whitaker
通讯作者：
M. Quintard;S. Whitaker
影响因子：
1.7
作者：
J. Simoneau;J. Champigny;O. Gelineau
通讯作者：
J. Simoneau;J. Champigny;O. Gelineau