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Numerical investigation on heat transfer characteristics of helium‐xenon gas mixture
Author(s) -
Qin Hao,
Fang Yuliang,
Wang Chenglong,
Tian Wenxi,
Qiu Suizheng,
Su Guanghui,
Deng Jian
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5692
Subject(s) - turbulence , prandtl number , helium , heat transfer , mechanics , xenon , temperature gradient , thermodynamics , turbulent prandtl number , computational fluid dynamics , chemistry , materials science , physics , atomic physics , meteorology , nusselt number , reynolds number
Summary Helium‐Xenon (He‐Xe) gas mixture featured with low Prandtl number is increasingly used in various energy devices as heat‐carrying agent. To figure out the heat transfer characteristics of He‐Xe gas mixture in uniformly heated circular and tri‐lobe channels, numerical investigations are conducted and presented in the article. The adopted calculation models are validated by comparison between simulation results and experimental data. The local and total heat transfer characteristics are obtained, and new temperature correction factors for the circular and tri‐lobe channels are proposed and recommended. The simulation results obtained by using the SST k − ω turbulent model agree well with the experimental data, this kind of turbulent model matched with appropriate turbulent Prandtl number model could provide satisfactory temperature predictions for He‐Xe gas mixture in a wide range of temperature ratio T w / T b . The simplified Petukhov correlation with temperature correction can give conservative predictions with relative error less than 10%. For the tri‐lobe channel, due to the local restricted flow, the gas temperature at the corners is much higher than that at the concavities. The local wall temperature and local Nu number vary azimuthally, showing a large temperature gradient. The tri‐lobe channel has better heat transfer performance than that of the circular tube when the temperature ratio T w / T b is no more than 1.5, but it deteriorates significantly with the increasing temperature ratio. This article may contribute to the numerical simulation and thermal design of heat transfer components concerning He‐Xe gas mixture.