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JAEA Reports

Experimental and numerical study on energy separation in vortex tube with a hollow helical fin (Joint research)

Kureta, Masatoshi; Yamagata, Yoji*; Miyakoshi, Ken*; Mashii, Tatsuya*; Miura, Yoshiaki*; Takahashi, Kazunori*

JAEA-Research 2022-007, 28 Pages, 2022/09

JAEA-Research-2022-007.pdf:8.17MB

To enhance energy separation in a counter-current Ranque-Hilsch vortex tube, a newly designed hollow helical fin was inserted into the hot tube of the vortex tube. In this study, the effect of the fin on the energy separation was investigated using three types of the vortex tube, and then computational fluid dynamics (CFD) simulation has been conducted to understand the experimental results and discuss the flow structure in the vortex tube with the hollow helical fin. As a result, it was found from the experimental data that the fin effectively enhanced energy separation, and that the tube length could be shorten. When the inlet air pressure was 0.5 MPa, the maximum temperature difference from the inlet to the cold exit was 62.2 $^{circ}$ C. The CFD code employing the Reynolds Stress Model (RSM) turbulence model was used to analyze the fluid dynamics in the vortex tube. As a result, it was confirmed that the temperature, velocity, and pressure distributions changed significantly at the stagnation point, and that the distributions in the tube with the fin were completely different from those without the fin. It was thought that a strong reversing helical vortex flow with small recirculating vortex structure formed between the fin end and the stagnation point on the cold exit side would enhance energy separation in the vortex tube with the hollow helical fin.

Journal Articles

Preparation of an extractant-impregnated porous membrane for the high-speed separation of a metal ion

Asai, Shiho; Watanabe, Kazuo; Sugo, Takanobu*; Saito, Kyoichi*

Journal of Chromatography A, 1094(1-2), p.158 - 164, 2005/11

https://doi.org/10.1016/j.chroma.2005.07.095

Times Cited Count：23 Percentile：54.28(Biochemical Research Methods)

The analysis of radioactive species in radioactive wastes is essential to the safe and economical disposal of such wastes. Among radioactive species, alpha- and beta-emitting nuclides should be purified prior to various radiometric determinations. To overcome the disadvantages of the conventional separation techniques, we have proposed functional porous hollow-fiber membranes that achieve a high speed operation assisted by convective flow. Stable immobilization in aqueous media is ensured by the hydrophobic interaction between the hydrophobic moiety of the extractant and octadecyl part of octadecylamino group. In this study, HDEHP, which shows the selectivity for rare earth elements, such as yttrium, was immobilized onto the porous membrane. The amount of immobilized HDEHP increased with increasing molar conversion. This can be explained by the fact that an increase in the C $_{18}$ NH group allows the polymer brush to extend itself due to electrostatic repulsion originating from the amino part of the C $_{18}$ NH group.

Journal Articles

Physics issues of high bootstrap current tokamaks

Ozeki, Takahisa; Azumi, Masafumi; Ishii, Yasutomo; Kishimoto, Yasuaki; G.Y.Fu*; Fujita, Takaaki; G.Rewoldt*; Kikuchi, Mitsuru; Kamada, Yutaka; Ide, Shunsuke; et al.

Plasma Physics and Controlled Fusion, 39(5A), p.A371 - A380, 1997/05

https://doi.org/10.1088/0741-3335/39/5A/034

no abstracts in English

Journal Articles

Test results of the FER/ITER conductors in the FENIX test facility

Sugimoto, Makoto; Isono, Takaaki; Koizumi, Norikiyo; Takahashi, Yoshikazu; Nishi, Masataka; Okuno, Kiyoshi; Yoshida, Kiyoshi; Nakajima, Hideo; Ando, Toshinari; Hosono, Fumikazu*; et al.

IEEE Transactions on Magnetics, 30(4), p.2042 - 2045, 1994/07

https://doi.org/10.1109/20.305669

Times Cited Count：1 Percentile：24.47(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles