Vortex breakdown phenomena in a circular pipe (4th Report, mechanism of axisymmetric bubble type breakdown).

Y. Suematsu, T. Ito, T. Hayase

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1 Citation (Scopus)

Abstract

An investigation is reported for the relation between an axisymmetric vortex breakdown and a stationary internal wave in a swirling flow field. An approximate mathematical model of the internal wave (wave disturbance) was constructed in consideration of fluid viscosity. Experiments were carried out on a swirling flow in a rotating pipe. The flow field, where internal waves occur, was observed by a visualization technique and was measured by a laser Doppler velocimeter. The effect of the upstream boundary condition on the internal wave was examined both by experiments and numerical calculations. The results are summarized as follows. A stationary internal wave occurs in a rotating pipe when the rotation is faster than a certain critical value. The characteristics of the waves were predicted fairly well by an approximate mathematical model. The bubble type breakdown is ultimately identified with the stationary internal wave of a sufficiently large amplitude.

Original languageEnglish
Pages (from-to)2086-2094
Number of pages9
JournalBULL. JSME
Volume29
Issue number253 , Jul. 1986
DOIs
Publication statusPublished - 1986
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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