Variable property solution for the natural convection in horizontal concentric annuli: Effect of the temperature difference ratio

Variable property solution for the natural convection in horizontal concentric annuli: Effect of the temperature difference ratio
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水平同心环内自然对流的变性质解:温差比的影响

DOI:
10.1016/j.ijheatmasstransfer.2017.05.025
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发表时间:
2017-09
影响因子:
5.2
通讯作者:
Cao Yuhui
Cao Yuhui
中科院分区:
工程技术2区
文献类型:
--
作者:
Cao Yuhui

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利用基于变属性的格子玻尔兹曼通量求解器,得到了充气水平同心环中自然对流的变属性解。在Ra和Pr数分别为5×10 4 和0.71的条件下讨论了温差比的影响。在大间隙环空中,仅形成一对反向旋转涡流,等效电导率随温差比增大而增大。在中等间隙环空中,流型取决于温差比,并且等效电导率有时会随着涡数的变化而显着降低。这表明温差比应作为研究非布辛涅斯克条件下流动不稳定行为和传热特性的重要参数。
The variable property solution for the natural convection in air-filled horizontal concentric annuli is obtained by using the variable property-based lattice Boltzmann flux solver. The effect of temperature difference ratio is discussed under the condition that the Ra and Pr numbers are 5× 10 4 and 0.71, respectively. In the large-gap annulus, only one pair of counter-rotating eddies is formed, and the equivalent conductivity increases with temperature difference ratio. In the moderate-gap annulus, the flow patterns depend on temperature difference ratio, and the equivalent conductivity sometimes has a notable decrease as the eddy number changes. These demonstrate that temperature difference ratio should be considered as an important parameter in the study about flow instability behaviors and heat transfer characteristics under non-Boussinesq conditions.
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