Effect of inclination angle on the startup of a frozen sodium heat pipe

Ma, Yugao; Yu, Hongxing; Huang, Shanfang; Zhang, Yingnan; Liu, Yu; Wang, Chenglong; Zhong, Ruicheng; Chai, Xiaoming; Zhu, Chaoyi; Wang, Xueqing

doi:10.1016/j.applthermaleng.2021.117625

Cited by 41 publications

(9 citation statements)

References 37 publications

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“…The results show that the moderation of the core can decrease the maximum neutron flux and is beneficial to reducing the thickness and weight of the shield. In addition, many studies (Ma et al, 2020a;Ma et al, 2021b;Ma et al, 2022a;Ma et al, 2022b) focused on thermal-hydraulic analyses of the Megapower. In order to improve the power output of the reactor, Westinghouse Electric Company (2017) proposed a 15 MWe eVinci reactor with UN fuel, which can operate for more than 10 years without refueling.…”

Section: Resultsmentioning

confidence: 99%

Numerical and Experimental Studies on Small/Micro Nuclear Reactors

2024

Frontiers Research Topics

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Frontiers is more than just an open access publisher of scholarly articles: it is a pioneering approach to the world of academia, radically improving the way scholarly research is managed. The grand vision of Frontiers is a world where all people have an equal opportunity to seek, share and generate knowledge. Frontiers provides immediate and permanent online open access to all its publications, but this alone is not enough to realize our grand goals. Frontiers journal seriesThe Frontiers journal series is a multi-tier and interdisciplinary set of openaccess, online journals, promising a paradigm shift from the current review, selection and dissemination processes in academic publishing. All Frontiers journals are driven by researchers for researchers; therefore, they constitute a service to the scholarly community. At the same time, the Frontiers journal series operates on a revolutionary invention, the tiered publishing system, initially addressing specific communities of scholars, and gradually climbing up to broader public understanding, thus serving the interests of the lay society, too. Dedication to qualityEach Frontiers article is a landmark of the highest quality, thanks to genuinely collaborative interactions between authors and review editors, who include some of the world's best academicians. Research must be certified by peers before entering a stream of knowledge that may eventually reach the public -and shape society; therefore, Frontiers only applies the most rigorous and unbiased reviews. Frontiers revolutionizes research publishing by freely delivering the most outstanding research, evaluated with no bias from both the academic and social point of view. By applying the most advanced information technologies, Frontiers is catapulting scholarly publishing into a new generation. What are Frontiers Research Topics?Frontiers Research Topics are very popular trademarks of the Frontiers journals series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area.

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Section: Resultsmentioning

confidence: 99%

Numerical and Experimental Studies on Small/Micro Nuclear Reactors

2024

Frontiers Research Topics

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“…By the capillary force generated in the wick structure, the working medium is driven from the evaporator section back to the condenser section, which could provide a very high value of equivalent thermal conductivity of up to 100000 W/mꞏK considering its lightweight and small size, thereby making it a competitive cooling device for electrical machines [9]. Due to the gravitational effect on the backflow of the working medium, the inclination angle has a significant impact on HP thermal performance, which has been confirmed by the studies in the fields of thermology and mechanical engineering [11][12][13][14][15][16]. If we define the inclination angle θ as the angle between the backflow direction and the gravity direction of the working medium, the gravitational effect on the backflow of the internal working medium in the HP can be divided into the gravity-assisted case (θ＜90 °) and gravity-opposed case (θ ＞90 °), as shown in Fig.…”

Section: Introductionmentioning

confidence: 86%

Research on the Effect of Heat Pipe Inclination Angle on Temperature Distribution in Electrical Machines

Zhao,

Zhang,

et al. 2023

IEEE Trans. on Ind. Applicat.

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Due to high equivalent thermal conductivity with lightweight and small size, heat pipes (HPs) are being extensively applied in the motor cooling system to improve its thermal performance. However, when practically installed in electrical machines, the inclination angle of the HP will affect its thermal conductivity and motor temperature distribution as well, which is still unclear. This article intends to figure out the effects of HP inclination angle on motor temperature distribution via both theoretical and experimental investigation. Based on the theoretical analysis of the HP inclination effect, the equivalent thermal conductivity of the HP with different inclination angles from 0 ° to 180 ° is experimentally investigated on a dedicated platform. Then, temperature distribution across a full-size statorwinding assembly with HPs is quantitatively studied using an established thermal model. Finally, the thermal simulation results are experimentally verified by testing on a processed specimen. The results indicate that the HP thermal performance degrades by over 80% with the inclination angle from 0 ° to 180 °, which results in a significant temperature nonuniformity across the motor under liquid cooling conditions.

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“…Heat pipe experiments usually focus on the investigation of operating limits [33][34][35][36][37][38], wick development and performance [39], startup transients [40,41], inclination angles [42][43][44], novel instrumentation [16,40,45], two-phase flow characteristics [46], and motion conditions [47]. This subsection discusses some of these different experimental approaches.…”

Section: Heat Pipe Experimental Methodsmentioning

confidence: 99%

“…Examples of transients include liquid metal heat pipe frozen startup, power transients during normal operation, recovery from heat pipe limit, the cascading failure of multiple heat pipes, and system level transients. Many works have investigated heat pipe response to changes in evaporator input power or condenser cooling rates [58][59][60], to transients in systems with heat pipes as components [61,62], and heat pipe startup [40,42,[63][64][65].…”

Section: Steady State and Transientsmentioning

confidence: 99%

Analyses Supporting Heat Pipe Experiments

Yilgor,

Sabharwall,

Hartvigsen

2023

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This internship report presents thermal analysis support aiding the development efforts of advanced reactor systems as a part of the Department of Energy Microreactor Program. The heat pipe microreactor (HPMR) is one such reactor concept where the heat from the reactor core is removed via passively operating heat pipes. Heat pipes have found numerous applications in many fields due to their simplicity, effectiveness, and reliability. The present work includes a review of heat pipe experiments and experimental techniques, ideation on experiments using the SPHERE test bed, identification of heat pipe phenomena of interest, and suggestions for future directions on heat pipe experiments. Hence, it directly supports the development of heat pipe microreactors (HPMRs).

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Effect of inclination angle on the startup of a frozen sodium heat pipe

Cited by 41 publications

References 37 publications

Numerical and Experimental Studies on Small/Micro Nuclear Reactors

Numerical and Experimental Studies on Small/Micro Nuclear Reactors

Research on the Effect of Heat Pipe Inclination Angle on Temperature Distribution in Electrical Machines

Analyses Supporting Heat Pipe Experiments

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