Examination of transient characteristics of two-phase natural circulation within a Freon-113 boiling/condensation loop

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Transient characteristics of two-phase natural circulation within a Freon-113 loop with a large condenser have been examined mainly focused on the flashing phenomenon. General behavior was described and parametric studies were performed. The items observed were the period and duration of flashing, peak flow rate, amount of flow carryover per flashing, lowest-peak liquid level within the condenser, and the peak void distribution in the riser section. The parameters considered were the heater power input, valve friction at the heater inlet (simulating the loopwise friction), condenser cooling, degree of subcooling at the heater inlet, and the heat loss to the surroundings. As a whole, the heater power input, valve friction, and the rate of condenser cooling played important roles in flashing while the other effects being marginal. In general, the flow appeared to be more unstable with the larger condensing surface which causes the condensation-induced flashing. (C) 1998 Elsevier Science S.A. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
1998-07
Language
English
Article Type
Article
Keywords

BOILING WATER-REACTORS; START-UP; THERMOHYDRAULICS; INSTABILITIES; OSCILLATION

Citation

NUCLEAR ENGINEERING AND DESIGN, v.183, no.1-2, pp.77 - 95

ISSN
0029-5493
URI
http://hdl.handle.net/10203/13128
Appears in Collection
ME-Journal Papers(저널논문)
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