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International Heat Transfer Conference 3

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

SYSTEM-INDUCED INSTABILITIES IN FORCED CONVECTION FLOWS WITH SUBCOOLED BOILING

John S. Maulbetsch
Massachusetts Institute of Technology Cambridge, Massachusetts

Peter Griffith
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 USA

DOI: 10.1615/IHTC3.540
pages 247-257

要約

This study of system-induced instabilities of forced-convection flows with boiling was restricted to the case of water flow in small (< 1/4") circular channels, high L/D ratios (25-200), moderate temperature and pressure (Tin ~ 70°F; Pex < 60 psia) and primarily directed toward subcooled boiling (hex. < hsat.liq.).
Both excursive and oscillatory instabilities were analyzed using a linearized, lump-parameter model, characterized by steady-state quantities. The energy storage mechanism for the oscillatory behavior were fluid inertia and system compressibility. The stability criteria were found to be dependent on a critical slope of the pressure drop-flow rate curve.
The analytical predictions were checked on a single tube apparatus with controlled compressibility and good agreement was obtained. Similar agreement was found in comparisons with stability data in the literature.

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