Turbulent heat mixing of a heavy liquid metal flow in the MEGAPIE target geometry—The heated jet experiment

Stieglitz, Robert; Daubner, M.; Batta, A.; Lefhalm, C.-H.

doi:10.1016/j.nucengdes.2007.02.016

Cited by 13 publications

(4 citation statements)

References 9 publications

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“…Previous liquid-metal target design calculations with k-ε and k-ω Shear Stress Transport (SST) turbulence models have shown good agreement with experimental data (mercury target experiment for EURISOL and lead-bismuth for MEGAPIE) for averageflow behavior and mean-velocity fields [20,21]. Because these models are less computationally intensive and since no energymixing process is accounted for in this design-optimization process, the SST k-ω turbulence model has been used for these steady-state simulations.…”

Section: Methodsmentioning

confidence: 79%

CFD analysis and optimization of a liquid lead–bismuth loop target for ISOL facilities

Houngbo

Popescu

Schuurmans

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tIn the context of the forthcoming next generation of Radioactive Ion Beams (RIBs) facilities based on an Isotope Separation On Line (ISOL) method, the development of production targets capable of dissipating the high power deposited by the primary beam is a major challenge. The concept of a high-power target based on a liquid Pb-Bi loop incorporating a heat-exchanger and a diffusion chamber was proposed within EURISOL DS and is being developed within the LIEBE 1 project. Due to the non-static character of the target, specific hydrodynamics issues are of concern. In this paper, these issues are studied mostly based on three-dimensional (3D) Computational Fluid Dynamics analysis of the flow of the Lead Bismuth Eutectic (LBE) target, resulting in optimized designs. The concept and hydrodynamic challenges of generating RIBs from a liquid-metal-loop target irradiated with a high-power primary beam are presented. The optimization of the target design has been conducted keeping in mind the need for a fast and efficient release of short-lived isotopes. This study shows that approximately 100 ms after the proton pulse the irradiated liquid-metal is entirely and uniformly evacuated from the irradiation volume and spread in a shower of small droplets (100-μm radii), in order to reduce the diffusion length of isotopes. Solutions to deal with the typical cavitation risk due to the presence of low-pressure zones in the liquid have also been found and simulated.

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Section: Methodsmentioning

confidence: 79%

CFD analysis and optimization of a liquid lead–bismuth loop target for ISOL facilities

Houngbo

Popescu

Schuurmans

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…This severely limits the potential for prototypic experimentation. The approach taken, therefore, is to perform best-estimate CFD simulations at different research centres, and to guarantee consistency by means of comparisons against measured data from specialeffect tests relevant to MEGAPIE [12][13][14] and benchmark exercises [15].…”

Section: Results Of Megapie Simulationsmentioning

confidence: 99%

An approach to coupled thermal hydraulics and structural mechanics problems for the MEGAPIE spallation source target

Smith

Zucchini

2007

Commun. Numer. Meth. Engng.

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SUMMARYThis paper describes some novel heat transfer and stress analysis problems that arose in the context of demonstrating the cooling principle of a liquid-metal neutron spallation source target. The design studies using computational fluid dynamics (CFD) resulted in an optimum flow configuration being defined for the coolant circulation. Simultaneously, stresses in the structural components were examined using finite element method (FEM) techniques. Central to the coupled CFD/FEM analysis strategy was the construction of an interface program, which enabled different specialist groups to carry out the thermal hydraulics and structural mechanics analyses using different commercial or in-house software packages within a common project, and with fully consistent model data. For the studies reported here, the commercial CFD code CFX-4 and the commercial structural analysis codes ABAQUS and ANSYS have been employed. Results for steady-state operation of the target show that the critical lower target components are adequately cooled, and that stresses and displacements are well within tolerances. Transient analysis of a beamtrip and power-up event is also described, showing that no stress crisis occurs.

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“…The experiments were carried out under the acronym KILOPIE [15]. The window consisted of a 0.15 mm thick T91 dish (just as in the reference design of the MEGAPIE target), and different methods were employed to provide the window heating.…”

Section: Kilopie Lbe Experimentsmentioning

confidence: 99%

Novel heat transfer issues associated with the design and safe operation of the MEGAPIE spallation source target

Smith

2007

J. of Therm. Sci.

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Critical heat transfer problems are discussed in the context of the operation of a spallation source target, which represents a first demonstration of the feasibility of an innovative concept for generating energy using a particle accelerator. Within the framework of the umbrella project MEGAPIE, an R&D support group was organized to take responsibility for target cooling. This involved the use of advanced numerical methods -Computational Fluid Dynamics (CFD) and Finite Element Method (FEM) -validated against suitable experimental data, and by means of appropriate benchmarking exercises. The design studies using CFD resulted in an optimum flow configuration being defined for the coolant circulation. Flow visualization tests were undertaken using a glass/water test section, with the velocity field mapped using optical and ultrasonic measuring techniques. These were followed by heat transfer tests, using the actual target materials (lead-bismuth-eutectic coolant and steel confinement). Further CFD/FEM work to analyze operational transients and accident sequences was also carried out, and is described in the paper.

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Turbulent heat mixing of a heavy liquid metal flow in the MEGAPIE target geometry—The heated jet experiment

Cited by 13 publications

References 9 publications

CFD analysis and optimization of a liquid lead–bismuth loop target for ISOL facilities

CFD analysis and optimization of a liquid lead–bismuth loop target for ISOL facilities

An approach to coupled thermal hydraulics and structural mechanics problems for the MEGAPIE spallation source target

Novel heat transfer issues associated with the design and safe operation of the MEGAPIE spallation source target

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