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ISSN Online: 2377-424X

International Heat Transfer Conference 3
August, 7-12, 1966, Chicago, USA

SYSTEM-INDUCED INSTABILITIES IN FORCED CONVECTION FLOWS WITH SUBCOOLED BOILING

Get access (open in a dialog) DOI: 10.1615/IHTC3.540
pages 247-257

Sinopsis

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.