Experimental investigation on the heat transfer performance of high-temperature potassium heat pipe for nuclear reactor

Tian, Wenxi; Xiao, Liu; Wang, Chenglong; Zhang, Dalin; Tian, Wenxi; Qiu, Suizheng; Su, G.H.

doi:10.1016/j.nucengdes.2021.111182

Cited by 58 publications

(8 citation statements)

References 29 publications

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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%

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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Section: Heat Pipe Experimental Methodsmentioning

confidence: 99%

Analyses Supporting Heat Pipe Experiments

Yilgor,

Sabharwall,

Hartvigsen

2023

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“…As the cooling water flow rate diminishes, the mean temperature of the working fluid within the sub-cooled heat-pipe causes it to rise gradually which ranged from 20 to 90g/s at thermal load of 1kW and evaporator length of 60 cm. The theoretical and experimental mean fluid temperatures for a sub-cooled heat pipe at various cooling flow rates are depicted in Figures (6) and (7), respectively. As a result of the reduced cooling flow rate over time, temperatures increase substantially at the onset of operation.…”

Section: Average Fluid Temperaturementioning

confidence: 99%

“…Extensive literature has examined the theoretical and experimental aspects of heat pipe characteristics. [7][8][9]. Wang et al [10] Examined the unstable initiation technique of a cylindrical micro-fluted heat pipe and found that CuO nanofluid can minimize the initiation time.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of Two-Phase Sub-Cooled Heat-Pipe at Different Regimes

Elsayed,

Ali,

Mansour

et al. 2024

Preprint

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A new sub-cooled two-phase thermosyphon or heat-pipe devices are important for enhancing heat transfer. The properties are examined using theoretical modeling and experimental measurements of the sub-cooled heat loop during the heating-up, steady-state, and cooling-down phases. Experimentally, the sub-cooled heat-pipe's heating rate effective, cooling rate, and evaporator length are evaluated in heating-up, steady-state, and cooling-down modes. The dynamic model of the sub-cooled heat-pipe in the current practical investigation is important for several applications of irregular operation. This research seeks to create a theoretical framework, which accurately represents the double-tube evaporator's dynamic properties. This will be achieved by examining several transient parameters throughout the warm-up, stable condition, and cool-down phases of operation. The model effectively reproduces the phase and thermal properties of a closed, sub-cooled heat-pipe containing two phases. The experimental results of our practical setup based on the thermal evaporator wall and the working fluid show simple exponential behavior. The results from the experimental measurements and the theoretical model demonstrate their mutual accord.

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“…For the thermal resistance, an improved network thermodynamic model of a heat pipe is adopted to obtain the thermal resistance. Based on the experiments of Tian et al, 1 verification of the network thermodynamic model is conducted.…”

Section: Heat Pipe Model Verificationmentioning

confidence: 99%

“…In the experiments of Tian et al, 1 potassium heat pipes with mesh screen, shown in Table 4, is tested. The potassium heat pipe with 20 g potassium is chosen, and the average temperature of the adiabatic section is thought as the working temperature.…”

Section: Heat Pipe Model Verificationmentioning

confidence: 99%

Single/ multi‐objective optimization and comparative analysis of liquid‐metal heat pipe

Tian

Liu

Wang

et al. 2022

Intl J of Energy Research

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Heat pipes utilize the latent heat of vaporization and lie on the capillary forces to maintain the circulation of working fluid. High-temperature heat pipes applied in the nuclear silent thermal-electrical reactor are investigated and optimized. Nine wick structures and several design variables are investigated in the single/multi-objective optimization. The improved network thermodynamic model of a heat pipe is adopted, and the thermal resistance, mass, and transport capacity of wicks are selected as the objective functions. Multiobjective optimization results are obtained by Pareto-optimal points.Comparative results reveal that mesh screen and annular artery present a better performance (0.00180 K/W) in both single and multiple objective optimizations. Potassium is preferred for the wick of the circular artery and rectangular artery, while sodium is preferred for the wick of isosceles-triangular groove and sintered fibers. And with the operating temperature (800 ~950 K), thermal resistance is decreased with the simultaneous rise of mass (165.2%) and transport capacity (154.6%) in the mesh screen. This work makes it possible to improve the operational performance of a heat pipe and provides a reference for the selection of wick structure and heat pipe design.

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Experimental investigation on the heat transfer performance of high-temperature potassium heat pipe for nuclear reactor

Cited by 58 publications

References 29 publications

Analyses Supporting Heat Pipe Experiments

Analyses Supporting Heat Pipe Experiments

Theoretical and Experimental Investigation of Two-Phase Sub-Cooled Heat-Pipe at Different Regimes

Single/ multi‐objective optimization and comparative analysis of liquid‐metal heat pipe

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