Study of a negatively buoyant jet of liquid metal in a density-stratified ambient
Study of a negatively buoyant jet of liquid metal in a density-stratified ambient
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密度分层环境中液态金属负浮力射流的研究
DOI：
10.1016/j.icheatmasstransfer.2022.106351
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发表时间：
2022
影响因子：
7
通讯作者：
Huang X
中科院分区：
文献类型：
--
作者：
Huang X
利用大涡模拟（LES）研究了低普朗特数下液态金属（铅铋共熔，LBE）在受限密度分层环境中的负浮力射流。射流的雷诺数re = 8240，密度弗劳德数Fr= 29。统计数据显示了射流的特征，如浮力效应和多剪切层的存在。湍流热通量与温度梯度之间的不对准意味着标准湍流模型不适用于这种流动。将低普朗特数对流与单位普朗特数下的水对流进行比较，研究流体相似性。分析了射流末端侵彻深度、平均速度和温度以及温度波动。LBE射流的速度发展表现出与水射流相同的行为，但平均温度的中心线变化和温度波动表现出分子在LBE热传递中的强烈扩散。用层流的相似解对侧壁的动量和热边界层进行了比较。温度分布与实验数据吻合较好，表明模拟结果令人满意。
Negatively buoyant jet of liquid metal (lead bismuth eutectic, LBE) at a low Prandtl number issued to a confined density-stratified ambient is investigated using large eddy simulation (LES). The Reynolds number and the densiometric Froude number of the jet are respectivelyRe= 8240,Fr= 29. The statistics demonstrate the features of the jet, such as the buoyancy effect and the presence of multiple shear layers. The misalignment between the turbulent heat flux and the temperature gradient implies that standard turbulence models are not suitable for such a flow.The low Prandtl number convection is compared with that of water at unity Prandtl number to investigate fluid similarity. The terminal penetration depth of the jet, mean velocity and temperature, and temperature fluctuations are analyzed. The velocity development of the LBE jet demonstrates the same behavior as that of the water jet, but the centerline variations of the mean temperature and the temperature fluctuations demonstrate the strong intensity of molecular diffusion in heat transport in LBE. The momentum and the thermal boundary layers at the side wall are compared with a similarity solution for laminar flow. The temperature distribution compares well with experimental data, demonstrating that the simulation returns satisfactory results.