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research-article

Experimental Study on Cavitation of a Liquid Lithium Jet for International Fusion Materials Irradiation Facility

[+] Author and Article Information
Hiroo Kondo

National Institutes for Quantum and Radiological Science and Technology 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan
kondo.hiroo@qst.go.jp

Takuji Kanemura

National Institutes for Quantum and Radiological Science and Technology 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan
kanemura.takuji@qst.go.jp

Tomohiro Furukawa

Japan Atomic Energy Agency 4002 Narita, Oarai, Ibaraki 311-1393, Japan
furukawa.tomohiro@jaea.go.jp

Yasushi Hirakawa

Japan Atomic Energy Agency 4002 Narita, Oarai, Ibaraki 311-1393, Japan
hirakawa.yasushi@jaea.go.jp

Eiichi Wakai

Japan Atomic Energy Agency 765-1 Funaishikawa, Tokai, Ibaraki 319-1184, Japan
wakai.eiichi@jaea.go.jp

Juan Knaster

IFMIF/EVEDA Project Team 2-166 Omotedate, Obuchi, Rokkasho-mura, Kamikita-gun, Aomori 039-3212, Japan
Juan.Knaster@ifmif.org

1Corresponding author.

ASME doi:10.1115/1.4036513 History: Received April 26, 2016; Revised April 04, 2017

Abstract

A liquid Li jet flowing at 15 m/s under a high vacuum of 10^-3 Pa is intended to serve as a beam target (Li target) in the planned International Fusion Materials Irradiation Facility (IFMIF). The engineering validation and engineering design activities (EVEDA) for the IFMIF are being implemented under the Broader Approach agreement. As a major activity of the Li target facility, the EVEDA Li test loop was constructed and a stable Li target was demonstrated. This study focuses on a cavitation-like acoustic noise detected in a downstream conduit where the Li target flowed under vacuum conditions. This noise was investigated using acoustic-emission (AE) sensors installed via acoustic wave guides. The sound intensity of the noise was examined against the cavitation number of the Li target. In addition, fast Fourier transform (FFT) and continuous wavelet transform (CWT) were performed to characterize the acoustic noise. Owing to the acoustic noise’s intermittency, high frequency, and the dependence on cavitation number, we conclude that this acoustic noise is generated when cavitation bubbles collapse. The location of the cavitation was fundamental for presuming the mechanism. In this study, the propagation of acoustic waves was used to localize the cavitation and a method to determine the location of cavitation was formulated. As a result, we found that cavitation occurred only in a narrow area where the Li target impinged on the downstream conduit; therefore, we concluded that this cavitation was induced by the impingement.

Copyright (c) 2017 by ASME
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