Verification of Thermal Performance Predictions of Prototypical Multi-Jet Impingement Helium-Cooled Divertor Module

Rader, Jordan D.; Mills, Brantley; Sadowski, D. L.; Yoda, Minami; Abdel‐Khalik, S. I.

doi:10.13182/fst12-544

Cited by 10 publications

(2 citation statements)

References 9 publications

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“…In electronics and power electronics devices [1], personal computer central processing units [2], blades and casings of gas turbines [3][4][5][6][7][8][9][10], combustion chamber liners of gas turbine engines [11,12], and magnetically confined plasma fusion reactors [13,14] macroscale and microscale multi-jet impingement and impingement-effusion high-heat flux cooling systems are utilized. To enhance heat transfer, a very high, nearly uniform heat transfer coefficient (HTC) distribution can be obtained at the stagnation zones of immersed jets injected from multiple orifices or nozzles having a one-dimensional (1D) or two-dimensional (2D) configuration, located over a smooth or roughened impingement surface.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement by Mitigating the Adverse Effects of Crossflow in a Multi-Jet Impingement Cooling System in Hexagonal Configuration by Coaxial Cylindrical Protrusion—Guide Vane Pairs

Untuç,

Unverdi

2023

Applied Sciences

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A novel compound multi-jet impingement system for enhanced cooling of a flat surface by augmenting its area with cylindrical protrusions (CPs) equipped with coaxial guide vanes (CGVs) and reducing deflection of jets by crossflow has been developed for high-heat removal applications. The cooling performance of coaxial circular jets impinging on the top faces of CPs placed in hexagonal configuration on a flat plate is evaluated by three-dimensional (3D) computational fluid dynamics (CFD) simulations. Jets impinging on the top faces of the protrusions are directed to their lateral faces and then to the base plate by the CGVs around the protrusions, resulting in up to 62.8% improvement in heat transfer rate with a minor increase in pressure drop. Effects of protrusion height and diameter on the pressure drop and cooling performance are studied for jet Reynolds (Re number range of 5000–20,000. Due to both shortened jet impingement lengths as the height of protrusions is increased and directing the expended fluid away from the impinging jets by CGVs, adverse effects of jet–crossflow interactions on cooling performance and fluid pumping power are significantly reduced. Performance evaluation criterion (PEC) of the novel compound multi-jet impingement cooling system (CMJICS) can be as high as 1.52.

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Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement by Mitigating the Adverse Effects of Crossflow in a Multi-Jet Impingement Cooling System in Hexagonal Configuration by Coaxial Cylindrical Protrusion—Guide Vane Pairs

Untuç,

Unverdi

2023

Applied Sciences

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“…Of the cooling techniques, impingement jet cooling is a powerful technique that achieves the highest heat transfer coefficient. In particular, the multi-array impingement jet (MAIJ), which applies the cooling performance of an impingement jet onto a larger area than that covered by a single impingement jet presented in Figure 1, has been adopted for the thermal management of divertors in nuclear fusion reactors because of its high heat transfer coefficient and thermal stability on a heated surface compared to other techniques [1,[28][29][30]. In addition, helium is a prominent working fluid to manage the thermal load on the divertor module because of its high thermal conductivity (~0.23 W/mK) and chemical and neutronic inertness, despite its high pumping power.…”

Section: Introductionmentioning

confidence: 99%

Heat-Absorbing Capacity of High-Heat-Flux Components in Nuclear Fusion Reactors

Lee

Kim²,

Moon³

et al. 2019

Energies

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Nuclear fusion energy is a solution to the substitution of fossil fuels and the global energy deficit. However, among the several problems encountered for realizing a nuclear fusion reactor, the divertor presents difficulties due to the tremendous heat flux (~10 MW/m2) from high-temperature plasma. Also, neutrons produce additional heat (~17.5 MW/m3) from collisions with the materials’ atoms. This may lead to unexpected effects such as thermal failure. Thus, a comprehensive investigation on the divertor module is needed to determine the heat-absorbing capacity of the divertor module so to maintain the effect of incident heat flux. In this study, using an analytical approach and a simulation, the quantitative effect of heat generation on the thermophysical behavior, such as temperature and thermal stress, was analyzed while maintaining the incident heat flux. Then, a correlated equation was derived from the thermal design criteria, namely, the maximum thimble temperature and the safety factor at the vulnerable point. Finally, on the basis of the thermal design criteria, the heat-absorbing capacity of a nuclear fusion reactor in operating conditions was determined. This study contributes to the understanding of the divertor’s effects in nuclear fusion reactors for high-heat-flux and high-temperature applications.

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Thermal design of helium cooled divertor for reliable operation

Lee

Kim

et al. 2017

Applied Thermal Engineering

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Verification of Thermal Performance Predictions of Prototypical Multi-Jet Impingement Helium-Cooled Divertor Module

Cited by 10 publications

References 9 publications

Heat Transfer Enhancement by Mitigating the Adverse Effects of Crossflow in a Multi-Jet Impingement Cooling System in Hexagonal Configuration by Coaxial Cylindrical Protrusion—Guide Vane Pairs

Heat Transfer Enhancement by Mitigating the Adverse Effects of Crossflow in a Multi-Jet Impingement Cooling System in Hexagonal Configuration by Coaxial Cylindrical Protrusion—Guide Vane Pairs

Heat-Absorbing Capacity of High-Heat-Flux Components in Nuclear Fusion Reactors

Thermal design of helium cooled divertor for reliable operation

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