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- W1569157072 abstract "Nonequilibrium dispersed two-phase flow can be encountered in nuclear reactor systems under normal and accidental conditions. Previous studies on this topic are mostly limited to simple pipe flows. Dispersed flow in complex geometries like bends and coils, which are being used in practice, is, however, still poorly understood. To that end, this study concentrates on the flow structure of the nonequilibrium dispersed two-phase flow through heated 90-deg circular bends based on experiment and theoretical analysis. In evaluating the nature of the high-quality dispersed flow, the behavior of the bulk vapor flow is of fundamental importance. Such three-dimensional developing flow is analyzed through single-phase computation as a first approximation. It is revealed that even for large bend-to-tube radius ratios of 28 and 42, there is an appreciable fluid acceleration at the outer side and deceleration at the inner side of the bend. More important is that a double-vortex secondary flow develops early in the bend and reaches a maximum at the middle of the bend, which accounts for [approximately]8 to 10% of the mean velocity. It is further indicated from computation that the single-phase flow structure depends mainly on the curvature ratio when the Reynolds number changes within a factor ofmore » 10 in the turbulent region.« less" @default.
- W1569157072 created "2016-06-24" @default.
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- W1569157072 date "1993-01-01" @default.
- W1569157072 modified "2023-09-23" @default.
- W1569157072 title "Flow structure of nonequilibrium dispersed flow through heated bends" @default.
- W1569157072 hasPublicationYear "1993" @default.
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