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Further studies of degraded core coolability: The effect of pressure and coolant flow from below: Interim report

Technical Report ·
OSTI ID:7037589
; ;
An experimental investigation was made to study dryout of a bed of inductively heated particles, cooled by an overlying liquid pool and a through flow of coolant or gas. Stainless steel particles of diameters .59 to .79 mm, 1.6 mm, 3.2 mm, and 4.8 mm were used. Freon-113, acetone, methanol and water were used as coolants and pressure was varied from 1 to 5.76 atm-abs. Bed height was varied from 8.0 cm to 21.0 cm and the overlying liquid ratio (liquid depth to bed height) was varied from 0.0 to 2.0. At 1 atm. abs. pressure the through flow was also varied. The measured dryout heat flux was found to increase with increased pressure and usually lower than predicted by available analytical models. The coolant above the bed was found to have little effect at higher pressures. The dryout heat flux also increased as the inlet flow increased and asymptotically approached the total evaporation energy of the inlet flow. The experimental measurements of dryout heat flux as a function of pressure were scaled so the reduced dryout heat flux was a function of reduced pressure and geometry only. The scaled Freon-113 results represent water up to 37.3 atm. The effect of gas flow from below on dryout was also studied experimentally. Freon-113 and water were used as coolants and gas mass flux varied from 0 to 0.211 kg/m/sup 2/sec. The dryout heat flux decreases as a result of increased bottom gas flow. The gas flow was found to have a stronger effect on small particle beds.
Research Organization:
California Univ., Los Angeles (USA)
OSTI ID:
7037589
Report Number(s):
EPRI-NP-4942; ON: TI87920129
Country of Publication:
United States
Language:
English

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