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- W78891196 abstract "Experiments have been conducted that model BandW Once Through Steam Generator (OTSG) heat transfer and fluid flow behavior during auxiliary feedwater (AFW) injection. The OTSG is a single-pass counterflow tube-in-shell heat exchanger in which decay heat removal capability is provided by injection of AFW into the steam generator boiler region. The experiments and analysis is described in this paper examine the basic phenomena of AFW radial and axial flow distribution, tube support plate (TSP) flooding, and tube heat transfer. Flow distribution is studied visually and measured in an unheated multitube (625 tubes) full scale 1/8 sector of the OTSG, which includes the top three TSP's. Steam flow is simulated by air flow. Heat transfer is examined in a heated single tube facility with either one or two broached hole support plates and either air or steam upflow. The flow distribution experiments indicate that radial, axial, and azimuthal spreading is a strong function of AFW flow rate and a weaker function of vapor upflow unless the flooding line is approached. A semi-empirical model of AFW penetration without gas flow is presented. The model is extended to include the influence of gas flow by correlation. The heat transfer experiments indicate that heatmore » transfer is highly dependent on AFW injection rate, and in particular on whether or not the water flows down the tubes as a continuous film or breaks into rivulets. A computer model of heat transfer has been developed, and is described. 4 refs., 21 figs.« less" @default.
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- W78891196 date "1988-01-01" @default.
- W78891196 modified "2023-09-27" @default.
- W78891196 title "Once through steam generator AFW (auxiliary feedwater) flow distribution and heat transfer" @default.
- W78891196 hasPublicationYear "1988" @default.
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