On the static and dynamic instabilities of two-phase flows in boiling channel with thermo-neutronic coupling

Book · Sat Jun 01 04:00:00 EDT 1996

OSTI ID:234301

Rao, Y F; Fukuda, K; Funamoto, S ^[1]

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1. Kyushu Univ., Fukuoka (Japan). Dept. of Nuclear Engineering

The linear stability analysis is performed in the frequency domain for both the static or Ledinegg and the dynamic or density-wave instabilities in a boiling channel with coupled effect of the thermodynamic and thermoneutronic feedbacks. Limiting cases are discussed in which one of the feedback subloops will play a dominant role in determining the stability. A few possible formulations of the characteristic equation are examined and a preferred one is suggested. Difficulties encountered in applying the Nyquist criterion using some of the formulations are investigated. It is shown that poles in the transfer functions due to an ill-defined determinant can result in an ill-posed characteristic equation for the static instability, which is found to be the cause of the failure to reveal the static instability in the previous paper. The stability criterion for the static instability is also discussed, and the effect on the stability boundary is examined for the Froude number and the frictional pressure-loss coefficient.

• OSTI ID: 234301
• Report Number(s): CONF-960306--; ISBN 0-7918-1226-X
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BWR TYPE REACTORS
HEAT TRANSFER
HYDRAULICS
REACTOR CHANNELS
REACTOR STABILITY
THEORETICAL DATA
TWO-PHASE FLOW