Length effect on entrainment limitation of vertical wickless heat pipe

Seo, Joseph; Lee, Jae-Young

doi:10.1016/j.ijheatmasstransfer.2016.05.096

Cited by 28 publications

(8 citation statements)

References 11 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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“…Seo and Lee studied the thermal hydraulic characteristics of a long deionized water heat pipe. It is found that the entrainment limit points are affected by the L/D value of the heat pipe [23]. Wang et al investigated potassium heat pipe heated with constant heat flux.…”

Section: Introductionmentioning

confidence: 99%

Design and verification of ultra-high temperature lithium heat pipe based experimental facility

et al. 2022

THERM SCI

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Lithium heat pipe has broad applications in heat pipe cooled reactors and hypersonic vehicles due to its ultra-high working temperature which is around 1700 K. In this paper, a lithium heat pipe based experimental facility has been designed to test the heat transfer performance of the lithium heat pipe. A simplified mathematical model of heat pipe has been implemented into a CFD approach, which is used to verify the design of lithium heat pipe and its experimental facility. Results showed that the CFD approach is in good agreements with some well-known existing models and experimental data, and deviation between the results is within 5% range. The adjustment range of mixed gas thermal resistance and cooling water flow rate was obtained by analyzing the effects of different cooling conditions on the performance of the experimental facility. It is necessary to ensure the cooling water flow rate is above 0.11l/h to prevent water boiling when the heating power is10kW around, and the optimal proportion of helium is 70% -90%.The operation characteristics of the lithium heat pipe under unsteady state with varying heating power were simulated numerically. The results show that the proportion of helium must be less than 60% for normal operation of the lithium heat pipe. This work provides a reference and numerical verification for the design of lithium heat pipe based experimental facility, which can be used to reveal the heat transfer mechanisms of the lithium heat pipe during the experiment.

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“…Esta relación indica cuan grande es el largo del termosifón bifásico en comparación al diámetro interno. Seo et al [6] y [7], estudiaron el comportamiento sobre el límite de arrastre y el rendimiento en grandes L/D. Estos autores llegaron a la conclusión que se necesitan más estudios empíricos para conseguir completar un modelo matemático que incluya esta relación en los límites de arrastre y en el desempeño térmico de estos dispositivos.…”

Section: Introductionunclassified

Estudio experimental de termosifones bifásicos con relación largo-diámetro interno constante para aplicaciones geotérmicas

2022

Congreso Iberoamericano De Ingeniería Mecánica-Cibim 2022

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En este trabajo se estudió experimentalmente la validez de la relación largo-diámetro interno (L/D) como herramienta de escalamiento en termosifones bifásicos extralargos para aplicaciones geotérmicas. Fueron estudiados dos termosifones con diferentes dimensiones, manteniendo la relación L/D=110. Los resultados obtenidos muestran que el termosifón de menor tamaño y mayor diámetro operó a temperaturas de vapor mayores (hasta de 20ºC) y resistencias térmicas menores (hasta 40%), mostrando que la relación L/D no es suficiente para escalar termosifones sin perder informaciones fundamentales de la operación de estos dispositivos. Fue propuesta una longitud característica, dada por D 2 /L, permite reducir significativamente las diferencias entre las resistencias térmicas de ambos termosifones. Sin embargo, se sugiere que el escalamiento de termosifones bifásicos extralargos no envuelva solo aspectos geométricos del dispositivo, sino que también incluya propiedades termofísicas del fluido de trabajo, las cuales son afectadas significativamente por la temperatura de operación del vapor.

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Length effect on entrainment limitation of vertical wickless heat pipe

Cited by 28 publications

References 11 publications

Analyses Supporting Heat Pipe Experiments

Analyses Supporting Heat Pipe Experiments

Design and verification of ultra-high temperature lithium heat pipe based experimental facility

Estudio experimental de termosifones bifásicos con relación largo-diámetro interno constante para aplicaciones geotérmicas

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