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JAEA Reports

Flow separation at inlet causing transition and intermittency in circular pipe flow

Ogawa, Masuro*

JAEA-Technology 2019-010, 22 Pages, 2019/07

JAEA-Technology-2019-010.pdf:1.5MB

Transition phenomena from laminar to turbulent flow are roughly classified into three categories. Circular pipe flow of the third category is linearly stable against any small disturbance, despite that flow actually transitions and transitional flow exhibits intermittency. These are among major challenges that are yet to be resolved in fluid dynamics. Thus, author proposes hypothesis as follows; "Flow in a circular pipe transitions from laminar flow because of vortices released from separation bubble forming in vicinity of inlet of pipe, and transitional flow becomes intermittent because vortex-shedding is intermittent." Present hypothesis can easily explain why linear stability theory has not been able to predict transition in circular pipe flow, why circular pipe flow actually transitions, why transitional flow actually exhibits intermittency even due to small disturbance, and why numerical analysis has not been able to predict intermittency of transitional flow in circular pipe.

Journal Articles

Procedure to prevent temperature rise of primary upper shielding in high temperature engineering test reactor (HTTR)

Tachibana, Yukio; Hontani, Koji*; Takeda, Takeshi; Saikusa, Akio; Shinozaki, Masayuki; Isozaki, Minoru; Iyoku, Tatsuo; Kunitomi, Kazuhiko

Nuclear Engineering and Design, 201(2-3), p.227 - 238, 2000/10

 Times Cited Count:3 Percentile:27.02(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Countermeasure to prevent temperature rise of primary upper shield in HTTR; Performance test of countermeasures under actural core configuration

Tachibana, Yukio; Hontani, Koji*; Kojima, Takao; Takeda, Takeshi; Emori, Koichi; Saruta, Toru; Iyoku, Tatsuo; Kunitomi, Kazuhiko

JAERI-Tech 2000-026, p.61 - 0, 2000/03

JAERI-Tech-2000-026.pdf:2.18MB

no abstracts in English

JAEA Reports

Countermeasure to prevent temperature rise of primary upper shield in HTTR; Additional countermeasures and their performance test

Tachibana, Yukio; Kunitomi, Kazuhiko; *; Sawa, Kazuhiro; Takeda, Takeshi; Saikusa, Akio; Kawaji, Satoshi; Iyoku, Tatsuo

JAERI-Tech 98-027, 74 Pages, 1998/07

JAERI-Tech-98-027.pdf:2.23MB

no abstracts in English

JAEA Reports

Counter-measure to prevent temperature rise of stand pipe and primary upper shielding in HTTR

Kunitomi, Kazuhiko; Tachibana, Yukio; *; Nakano, Masaaki*; Saikusa, Akio; Takeda, Takeshi; Iyoku, Tatsuo; ; Sawahata, Hiroaki; Okubo, Minoru; et al.

JAERI-Tech 97-040, 91 Pages, 1997/09

JAERI-Tech-97-040.pdf:2.51MB

no abstracts in English

Journal Articles

Thermohydraulic experiments on a water jet into vacuum during ingress of coolant event in a fusion experimental reactor

Ogawa, Masuro; Kunugi, Tomoaki

Fusion Engineering and Design, 29, p.233 - 237, 1995/00

 Times Cited Count:8 Percentile:60.06(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

A Study on cooling air flow around stand-pipes for the High Temperature Engineering Test Reactor

Takeda, Takeshi; Kunitomi, Kazuhiko; *

JAERI-M 93-215, 32 Pages, 1993/10

JAERI-M-93-215.pdf:1.33MB

no abstracts in English

JAEA Reports

Study on thermal performance calculation of vertical gravity-assisted heat pipes for irradiation capsules

M.Li*; ; ; Saito, Takashi; ; Itabashi, Yukio;

JAERI-M 90-190, 35 Pages, 1990/11

JAERI-M-90-190.pdf:0.92MB

no abstracts in English

Journal Articles

Conceptual study of a very small reactor with coated particle fuel

; Kanno, Ikuo; *; Takizuka, Takakazu; Ogawa, Toru; Kaneko, Yoshihiko; *; *; *; *; et al.

J. Space Technol. Sci., 5(2), p.5 - 14, 1990/00

no abstracts in English

Journal Articles

Numerical simulation of turbulent gas-particle fluid flow and heat transfer

Kunugi, Tomoaki; M.Z.Hasan*;

Proc. of IEEE 13th Symp. on Fusion Engineering, Vol. 2, p.882 - 885, 1989/00

no abstracts in English

JAEA Reports

A Fundamental characteristic of V.C.H.P. for JMTR capsule

Tsuyuzaki, Noriyoshi; Saito, Takashi; *

JAERI-M 88-227, 12 Pages, 1988/11

JAERI-M-88-227.pdf:0.45MB

no abstracts in English

Journal Articles

An Experimental investigation of transient characteristics in a gravity-assisted heat pipe

Kaminaga, Fumito*; Tsuyuzaki, Noriyoshi; Saito, Takashi; *; Okamoto, Yoshizo*

Inst. Space Aeronaut. Sci., Rep., No. 6, p.55 - 60, 1988/00

no abstracts in English

Journal Articles

Survey of heat-pipe apprication under nuclear environment

; ; ; *;

Hito Paipu Gijutsu; Nihon Hito Paipu Kyokai Kaiho, 17, p.20 - 34, 1986/00

no abstracts in English

Journal Articles

Heat-pipes for use in space nuclear reactor

; ; ; *;

Hito Paipu Gijutsu; Nihon Hito Paipu Kyokai Kaiho, 18, p.22 - 36, 1986/00

no abstracts in English

JAEA Reports

Test of High Temperature Fuel Element,II; High Temperature Piping

Akino, Norio; ; Nekoya, Shinichi; Takizuka, Takakazu; Emori, Kouichi; Sanokawa, Konomo;

JAERI-M 9195, 41 Pages, 1980/11

JAERI-M-9195.pdf:2.69MB

no abstracts in English

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