A review on heat transfer characteristics of cryogenic heat pipes

Haghighi, Arman; Maleki, Akbar; Assad, Mamdouh El Haj; Chen, Lingen; Nazari, Mohammad Alhuyi; Shadloo, Mostafa Safdari

doi:10.1007/s10973-021-10918-9

Cited by 8 publications

(3 citation statements)

References 85 publications

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“…The 35 bar pressure was chosen to feature the unique thermophysical property variation of nitrogen at its pseudocritical point, while the 40 bar was a case of comparison. The heat flux and mass flux values were picked based on other supercritical nitrogen studies in the literature [8][9][10] and more importantly to enable the occurrence of the interested nitrogen pseudocritical transition within the heat transfer test section. The 38.1 and 50.8 kg/m 2 -s mass fluxes were selected also to ensure turbulent flow conditions in the test coil, with approximate Reynolds number range of 4300 < Re < 18100.…”

Section: Experimental Apparatusmentioning

confidence: 99%

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Heat Transfer of Near Pseudocritical Nitrogen in Helically Coiled Tube for Cryogenic Energy Storage

Wang

Liu

et al. 2022

Energies

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This paper investigates the cryogenic heat transfer phenomena of nitrogen flowing in helically coiled tubes under the combined effects of pseudocritical conditions, buoyancy, and coil curvature. The ultimate goal was to design optimum heat exchangers for liquid air energy storage. Local heat transfer coefficients were evaluated peripherally across tube cross sections. The pressure, mass flux, and heat flux effects on the heat transfer were examined. The dual effect of buoyancy and coil curvature on heat transfer coefficients was interpreted via a dimensionless number Ψ, which denotes a ratio between the two effects. Results reveal that the heat transfer coefficients increase with increasing mass flux but decreasing pressure and heat flux. The buoyancy effect dominates the heat transfer at fluid temperatures below the pseudocritical temperature (e.g., −146.3 °C at 35 bar), while the coil curvature-induced centrifugal effect dominates at higher temperatures. The heat transfer coefficients for the helical coil were approximately 13% lower compared with those in straight tube at fluid temperatures below the pseudocritical temperature, but their difference shrinks (<±6%) at higher temperatures. The reason is that the benefits of coil curvature and improved turbulent mixing on heat transfer are counteracted by the thermophysical property variation and buoyancy effect.

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Section: Experimental Apparatusmentioning

confidence: 99%

“…Meanwhile thermal management demand keeps growing, as well as the need for cryogenic heat transfer fluid alternatives [10]. Supercritical nitrogen is one of the cryogenic heat transfer fluids that has been used in many critical applications, as it can operate below −150 • C without phase change at ~35 bar line pressures.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer of Near Pseudocritical Nitrogen in Helically Coiled Tube for Cryogenic Energy Storage

Wang

Liu

et al. 2022

Energies

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“…Conventional heat transfer techniques such as thermal silicone grease [11][12][13] , composite ller materials 14,15 , thermal gel 16,17 , heat pipe [18][19][20][21][22] , and graphite sheets [23][24][25] have been well developed. They mainly rely on isotropic heat conduction and convection, which cannot arbitrarily manipulate heat ow along a designed path.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast unidirectional on-chip heat transfer

Jia

Yang

Liu

et al. 2023

Preprint

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Effective and rapid heat transfer is critical to improving electronic components' performance and operational stability, particularly for miniaturized devices with high heat dissipation demands. However, current thermal manipulation approaches, including the recent advancement in thermal metamaterials, cannot realize fast and unidirectional control of the heat flow path. In addition, any defects in thermal conductive materials cause a significant decrease in thermal conductivity, severely degrading heat transfer performance. Here, we demonstrate a new approach to achieve ultrafast unidirectional on-chip heat transfer. Using silicon-based valley photonic crystals (VPCs), we have realized robust unidirectional heat transfer through thermal radiation in the infrared wavelength region. This approach can facilitate heat transfer through arbitrarily designed heat flow paths with near-unity heat transmission efficiency independent of temperature. Furthermore, the design exhibits defect immune heat transfer capability due to the unique properties of VPC structures. It opens new possibilities in heat transfer without the inherent limitations of conventional conductive heat transfer mechanism, which inevitably heats up the entire devices, causing severe performance degradation and energy waste. The design is fully CMOS compatible, thus, will find broad applications, particularly in heat dissipation for integrated optoelectronic devices.

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Thermal behaviors in the metal high-efficiency grinding process under simulated vacuum conditions: state of the art and future perspectives

Zhang,

Wang

et al. 2024

Int J Adv Manuf Technol

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A review on heat transfer characteristics of cryogenic heat pipes

Cited by 8 publications

References 85 publications

Heat Transfer of Near Pseudocritical Nitrogen in Helically Coiled Tube for Cryogenic Energy Storage

Heat Transfer of Near Pseudocritical Nitrogen in Helically Coiled Tube for Cryogenic Energy Storage

Ultrafast unidirectional on-chip heat transfer

Thermal behaviors in the metal high-efficiency grinding process under simulated vacuum conditions: state of the art and future perspectives

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