Small-bubble gas injection to mitigate cavitation-induced erosion damage and reduce strain in target vessels at the Spallation Neutron Source

McClintock, David A; Liu, Yun; Bruce, Douglas R.; Winder, Drew E.; Schwartz, Richard G.; Kyte, Matt; Blokland, W.; Sangrey, Robert; Carroll, T.M.; Long, Cary D.; Jiang, Hao; Riemer, Bernard

doi:10.1016/j.matdes.2022.110937

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…Before introducing bubbles in mercury, the traditional finite element model validated at FTS includes the solid stainless-steel vessel, and the flowing mercury which relies on the EOS material model and its tensile threshold to describe the dynamic behaviour [4]. Experimental measurements shows that small helium bubbles injection into mercury can significantly reduce the stress/strain response on the stainless-steel vessel, more importantly to reduce the pitting damages [6]. However due to the strain reduction effect from injected bubbles, the simplified EOS mercury model is no more applicable to predict target vessel's strains.…”

Section: R-p Model and Its Integration In Sierramentioning

confidence: 99%

Calibration of the 2-Phase Bubble Tracking Model for Liquid Mercury Target Simulation with Machine Learning Surrogate Models

Lin,

Tran,

Radaideh

et al. 2024

J. Phys.: Conf. Ser.

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The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is one of the most powerful accelerator-driven neutron sources in the world. The intense protons strike on SNS’s mercury target to provide bright neutron beams, which also leads to severe fluid-structure interactions inside the target. Prediction of resultant loading on the target is difficult particularly when helium gas is injected into mercury to reduce the loading and mitigate the pitting damage on vessel walls. A 2-phase material model that incorporates the Rayleigh-Plesset (R-P) model is expected to address this multi-physics problem. However, several uncertain parameters in the R-P model require intensive simulations to determine their optimal values. With the help of machine learning and the measured target strain, we have studied the major uncertain parameters in this R-P model and developed a framework to identify optimal parameters that significantly reduce the discrepancy between simulations and experimental strains. The preliminary results show the possibility of using this mercury/helium mixture and surrogate models to predict a better match of target strain response when the helium gas is injected.

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Section: R-p Model and Its Integration In Sierramentioning

confidence: 99%

Calibration of the 2-Phase Bubble Tracking Model for Liquid Mercury Target Simulation with Machine Learning Surrogate Models

Lin,

Tran,

Radaideh

et al. 2024

J. Phys.: Conf. Ser.

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“…Associated challenges of a reliable rotation target include the drive system (bearings and lubricants) and the ability to operate in a high-radiation and high-temperature environment. Flowing liquid metals have also been successfully used as high-power neutron-production targets [33][34][35] after significant R&D to mitigate issues such as cavitation-induced erosion damage [36][37][38][39][40][41][42]. Other novel targetry concepts being explored include a fixed granular target design, a conveyor target (being developed at Fermilab to support the Mu2e-II experiment) and a flowing granular target (possible Muon collider target) [43][44][45][46][47][48][49][50].…”

Section: Rotating Flowing and Circulating Targetsmentioning

confidence: 99%

High Power Targetry R&D and support for future generation accelerator

et al. 2023

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A high-power target system is a key beam element to complete future High Energy Physics (HEP) experiments. The target endures high power pulsed beam, leading to high cycle thermal stresses/pressures and thermal shocks. The increased beam power will also create significant challenges such as corrosion and radiation damage that can cause harmful effects on the material and degrade their mechanical and thermal properties during irradiation. This can eventually lead to the failure of the material and drastically reduce the lifetime of targets and beam intercepting devices. Designing a reliable target is already a challenge for MW class facilities today and has led several major accelerator facilities to operate at lower power due to target concerns. With present plans to increase beam power for next generation accelerator facilities in the next decade and the multi-year time-scale to acquire the knowledge on material behavior under such extreme environment, timely R&D of robust high-power targets is critical to fully secure the physics benefits of ambitious accelerator power upgrades. The next generation of high-power targets for future accelerators will use more complex geometries, novel materials, and new concepts allowing better high heat flux cooling methods. Advanced numerical simulations need to be developed to satisfy the physical design requirements of reliable beam-intercepting devices. In parallel, radiation hardened beam instrumentation irradiation methods for high-power targets must be further developed. Additional irradiation facilities are needed since only a few facilities worldwide offer beams for target testing, and the beam provided may not be appropriate for the specific facility or project. Thus, a comprehensive research and development program must be implemented to address the challenges that multi-MW targets face.

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“…Kurva head pompa yang dihasilkan lebih rendah dibandingkan dengan kurva head pompa pada aliran satu fase. Selain itu, ditemukan juga bahwa peningkatan kecepatan udara menyebabkan penurunan pada head pompa [16]- [18].…”

Section: Pendahuluanunclassified

Analisis Pengaruh Tinggi Hisap Pompa Sentrifugal Terhadap Kapasitas Dan Efisiensi Pompa

Rasyid,

Ritonga,

Aldori

et al. 2023

JMEMME

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Pompa adalah peralatan mekanis untuk meningkatkan energi tenakan pada cairan(fluida) yang dipompa dengan mengubah energi mekanis poros penggerak menjadi energi potensial dan energi kinetis fluida. Seiring berkembangnya teknologi, pompa digunakan diberbagai bidang termasuk pemakaiannya dalam bidang indsutri. Pompa Sentrifugal merupakan salah satu jenis pompa yang mempunyai lingkup penggunaan yang sangat luas terkait dengan head dan kapasitas yang dihasilkan. Pada kesempatan ini penulis mencoba memaparkan hasil penelitian tentang unjuk kerja pompa sentrifugal bila dilakukan variasi tinggi hisap pada pompa sentrifugal akan mempengaruhi kapasitas, Head, Daya Hidraulis dan effesiensi pompa sentrifugal. Variasi tinggi hisap dimaksudkan untuk mengetahui peningkatan performance pompa yang terjadi akibat penambahan tinggi hisap pompa. Menambah tinggi hisap pompa sangat berpengaruh terhadap kapasitas aliran air yang dihasilkan, hal ini juga akan mempengaruhi kerja pompa, kecepatan spesifik, daya dan efesiensi pompa. Sehingga dapat diperoleh titik kerja tertinggi pompa sentrifugal dengan Kapasitas (Q) 0,001180 m3/s, Head (H) 6,066 m, Daya Hidraulis (Ph) 70,008 watt, Effesiensi (É³p) 26,51 %, hal ini dapat terlaksana bila diikuti penambahan daya dari motor penggeraknya.

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Small-bubble gas injection to mitigate cavitation-induced erosion damage and reduce strain in target vessels at the Spallation Neutron Source

Cited by 7 publications

References 33 publications

Calibration of the 2-Phase Bubble Tracking Model for Liquid Mercury Target Simulation with Machine Learning Surrogate Models

Calibration of the 2-Phase Bubble Tracking Model for Liquid Mercury Target Simulation with Machine Learning Surrogate Models

High Power Targetry R&D and support for future generation accelerator

Analisis Pengaruh Tinggi Hisap Pompa Sentrifugal Terhadap Kapasitas Dan Efisiensi Pompa

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