Experimental study on two-phase flow instability in system including downcomers.

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概要

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• Two-phase flow instability in a system including downcomers is studied experimentally. The system used for experiments consists of two parallel channels each composed of a "first riser", a downcomer and a "second riser" in order. Four series of experiments are carried out with a first-riser-heated single channel system, a downcomer-heated single channel system, a first-riser-heated parallel channel system and a down-corner-heated parallel channel system.<BR>A dynamic instability is observed in the experiments with the single channel system, while a kind of static instability, "one-sided flow" as well as a dynamic instability, are observed in the experiments with the parallel channel system. As it is proved that the static instability, in this case, results from the negative slope in W-ΔP characteristics which is mainly due to the term of static pressure loss in the downcomer, it is concluded that this instability is peculiar to systems including downcomers. Another instability associated with condensation of vapor trapped in the top of the downcomer is also observed.

• 一般社団法人 日本原子力学会の論文

著者

• Hasegawa Shu

  Faculty Of Engineering Kyushu University

• Tanihira Masanori

  Mitsubishi Heavy Industries Ltd.

• Fukuda Kenji

  Faculty of Engineering, Okayama University

• SAKAI Takaaki

  Interdisciplinary Graduate School, Kyushu University

• KONDO Tetsuya

  Faculty of Engineering, Kyushu University

• FUKUDA Kenji

  Faculty of Engineering, Kyushu University

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