Initial Free Surface Instabilities on a High-Speed Water Jet Simulating a Liquid-Metal Target

Itoh, Kazuhiro; Tsuji, Yoshiyuki; Nakamura, Hideo; Kukita, Yutaka

doi:10.13182/fst99-a93

Cited by 41 publications

(28 citation statements)

References 12 publications

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“…From the velocity of 5 m/s, propagation of wave was observed in the video. According to the water experiment [4], the whole water surface was covered by irregular three dimensional waves and the velocity profile showed turbulent property at the velocity of more than 9 m/s. In the case of the Li flow with the new test section, irregular three-dimensional waves were observed at the velocity of more than 11 m/s.…”

Section: Measurement Of Surface Waves Using High Speed Video Cameramentioning

confidence: 99%

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Overview: Free surface measurement with renewed nozzle of Osaka Li loop

Yoshihashi-Suzuki

Sugiura

Hoashi

et al. 2011

Fusion Engineering and Design

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Section: Measurement Of Surface Waves Using High Speed Video Cameramentioning

confidence: 99%

“…After the preliminary activities of the Li target [2][3][4] were completed, a study of a Li jet simulating the IFMIF target was started using the Li circulation loop at Osaka University. The objectives of the study were to research the high speed free surface behavior and the hydraulics associated with the target flow.…”

Section: Introductionmentioning

confidence: 99%

Overview: Free surface measurement with renewed nozzle of Osaka Li loop

Yoshihashi-Suzuki

Sugiura

Hoashi

et al. 2011

Fusion Engineering and Design

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“…Such study on the Li jet in the IFMIF was conducted through the IFMIF Conceptual Design Activity (IFMIF-CDA) (IFMIF-CDA team, 1996, andIFMIF team, 1999) with reference to previous projects of the Fusion Material Irradiation Test facility (Hassberger, 1983) and the Energy Selective Neutron Irradiation Test facility (Noda, et al, 1990). The IFMIF-CDA mainly focused on a water experiment and a thermal-hydraulic analysis, and the performance of the two-staged contraction nozzle was established in the water experiment (Itoh, et al, 1999a, 2000b, and Ida, et al, 2002. In response to these studies, we started Li experiment using the liquid metal Li circulation facility of Osaka University (Li loop) (Uda, et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Study on formation and development of surface wave of liquid metal lithium jet for IFMIF

Hoashi

Yoshihashi-Suzuki

Okita

et al. 2014

Mechanical Engineering Journal

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The international fusion materials irradiation facility (IFMIF) presents an intense neutron source to develop fusion reactor materials. The liquid metal Lithium (Li) jet with a free surface is planned as a target irradiated by two deuteron beam to generate intense neutrons and it is thus important to obtain information on the surface wave characteristic for the safety and the efficiency of system in the IFMIF. We have been studying on surface wave characteristics experimentally using the liquid metal Li circulation facility at Osaka University and numerically using computational fluid dynamics (CFD) code, FLUENT. The CFD simulation has been used in order to establish the mechanism of the formation and development of the surface wave of the liquid Li jet. The introduction of a two-staged contraction nozzle is planned in the IFMIF. This nozzle has a concave wall at each contraction part, and it was then predicted that Görtler vortices in the boundary layer inside the nozzle was generated and flowed out from the nozzle exit at the high velocity condition in our previous simulation. The Li free surface flow simulation including the flow inside the nozzle set in our Li loop was conducted to compare simulation results with experimental results. In this simulation, large eddy simulation and volume of fluid models are used as turbulence model and interface tracking method, respectively. Our simulation result indicates that both transverse vortices due to gas-liquid shear stress and longitudinal vortices induced by Görtler vortices downstream the nozzle exit contribute to the formation of three-dimensional wave of the Li free surface flow at the jet velocity of 15 m/s. It was found that the vortex structure and the flow pattern under the free surface due to the flow inside the nozzle strongly contributed the development of the surface wave of the liquid Li jet.

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“…E-mail address: kanemura.takuji@jaea.go.jp (T. Kanemura). ments on a Li jet were started using a Li loop at Osaka University, following preliminary experiments on the water jet [1].…”

Section: Introductionmentioning

confidence: 99%