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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

Natural convection heat transfer from heated horizontal cylinders with thermal stratification and circular flow in enclosure

Kubo, Shinji; Akino, Norio; Tanaka, Amane*; ;

Nihon Kikai Gakkai Rombunshu, B, 64(623), p.336 - 344, 1998/07

no abstracts in English

Journal Articles

Journal Articles

On a potential flow theory for a bluff body in a parallel channel, Pt.2; Circular cylinder

Nihon Kikai Gakkai Rombunshu, B, 52(473), p.436 - 440, 1986/00

no abstracts in English

Journal Articles

Experimental study of differences in DNB heat flux between upflow and downflow in a vertical channel

Sudo, Yukio; ; ; Kaminaga, Masanori;

Journal of Nuclear Science and Technology, 22(8), p.604 - 618, 1985/00

 Times Cited Count:66 Percentile:98.22(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Flow around turbulence promoters in parallel channel, Pt.2; Shedding vortex around cylinder

Journal of Nuclear Science and Technology, 20(5), p.389 - 399, 1983/00

 Times Cited Count:2 Percentile:34.94(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Flow around turbulence promoters in parallel channel, 1; Flow patterns around cylinder-type turbulence promoters

; Takizuka, Takakazu; Okamoto, Yoshizo

Journal of Nuclear Science and Technology, 19(9), p.720 - 728, 1982/00

no abstracts in English

Journal Articles

Stability conditions for circular flows of ordinary fluid and hydromagnetic fluid in axial magnetic field with respect to flute-mode perturbations

Journal of the Physical Society of Japan, 37(2), p.482 - 485, 1974/02

 Times Cited Count:3

no abstracts in English

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