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Nusselt number correlation for turbulent heat transfer of helium-xenon gas mixtures

nuclear Science and Techniques 2021年第11期32卷 119-133页

作者： Biao Zhou Yu Ji Jun Sun Yu-Liang Sun Institute of nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China

A gas-cooled nuclear reactor combined with a Brayton cycle shows promise as a technology for highpower space nuclear power ***,a helium-xenon gas mixture with a molecular weight of14.5-40.0 g/mol is adopted as the working fluid to reduce the mass and volume of the *** Prandtl number for helium-xenon mixtures with this recommended mixing ratio may be as low as *** the convective heat transfer is closely related to the Prandtl number,different heat transfer correlations are often needed for fluids with various Prandtl *** studies have established heat transfer correlations for fluids with medium-high Prandtl numbers(such as air and water)and extremely lowPrandtl fluids(such as liquid metals);however,these correlations cannot be directly recommended for such helium-xenon mixtures without *** study initially assessed the applicability of existing Nusselt number correlations,finding that the selected correlations are unsuitable for helium-xenon *** establish a more general heat transfer correlation,a theoretical derivation was conducted using the turbulent boundary layer *** simulations of turbulent heat transfer for helium-xenon mixtures were carried out using Ansys *** on simulated results,the parameters in the derived heat transfer correlation are *** is found that calculations using the new correlation were in good agreement with the experimental data,verifying its applicability to the turbulent heat transfer for helium-xenon *** effect of variable gas properties on turbulent heat transfer was also analyzed,and a modified heat transfer correlation with the temperature ratio was *** on the working conditions adopted in this study,the numerical error of the property-variable heat transfer correlation was almost within 10%.

关键词： Gas-cooled nuclear reactor space nuclear power Helium–xenon mixtures Convective heat transfer Nusselt number

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Perspective on liquid metal enabled space science and technology

引用

Science China(Technological Sciences) 2020年第7期63卷 1127-1140页

作者： ZHANG Xu-Dong LIU Jing Beijing Key Lab of Cryo-Biomedical Engineering and Key Lab of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100039China Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing 100084China

With the rapid development of deep space exploration and commercial flight, a series of tough scientific and technological challenges were raised, which urgently require ever advanced technologies to tackle with. Recently, liquid metals, as a kind of newly emerging functional material, are attracting various attention and many breakthroughs have been made on earth. Such a scientific trend also suggests promising approaches for solving those extreme challenges in space environment. To fulfill the increasing needs thus involved, this article is dedicated to systematically introducing liquid metal material and its related disciplines into space science and technology. Firstly, existing application of liquid metal cooling for space nuclear power was summarized. Then, some potential space practices were tentatively put forward, such as liquid metal thermal interface medium,liquid metal phase change material, liquid metal convection cooling, metal alloy thermal storage, liquid metal electromagnetic shielding and liquid metal electronic printing. Fundamental as well as practical issues that would differ with earth were interpreted. Finally, potential liquid metal space experiments were proposed to investigate the liquid metal hydrodynamic characteristic, wettability and phase change mechanism in space physical environment. Overall, liquid metal enabled space science and technology investigation will not only help efficiently solve the current and future space technological problems, but also aid to stimulate the advancement of liquid metal space material science.

关键词： liquid metal space science and technology space nuclear power thermal management electromagnetic shielding electronic printing hydrodynamic characteristics

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