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Titolo:
INSTABILITIES IN PLANE POISEUILLE FLOW DUE TO THE COMBINED EFFECTS OFSTRATIFICATION AND VISCOSITY
Autore:
NG BS; REID WH;
Indirizzi:
INDIANA UNIV PURDUE UNIV,DEPT MATH SCI INDIANAPOLIS IN 46202
Titolo Testata:
Physics of fluids
fascicolo: 6, volume: 9, anno: 1997,
pagine: 1844 - 1846
SICI:
1070-6631(1997)9:6<1844:IIPPFD>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
STABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
9
Recensione:
Indirizzi per estratti:
Citazione:
B.S. Ng e W.H. Reid, "INSTABILITIES IN PLANE POISEUILLE FLOW DUE TO THE COMBINED EFFECTS OFSTRATIFICATION AND VISCOSITY", Physics of fluids, 9(6), 1997, pp. 1844-1846

Abstract

The stability of stably stratified plane Poiseueille flow is considered in the case when the buoyancy frequency is given by N-2(z) = z(4). It is well known that the Tollmien-Schlichting mode of instability forthis flow becomes completely stable as the Richardson number Ri up arrow 0.222. For larger values of Ri, however, new modes of instability appear which are of the ''center'' or ''fast'' type. These new modes are due to the combined effects of stratification and viscosity which are strongly destabilizing and lead to a minimum critical Reynolds number of about 124. Detailed stability characteristics in the form of curves of marginal stability are presented for various values of the Richardson and Prandtl numbers. (C) 1997 American Institute of Physics.

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Documento generato il 22/09/20 alle ore 17:21:03