Experimental and Mechanical Research on Chf Characteristics During Combined/Bottom Quenching in Narrow Rectangular Channel
Critical heat flux (CHF) phenomenon plays an important role during quenching phase when loss of coolant accident (LOCA) occurs in plate-type fuel reactor core. Heat transfer capability can be greatly enhanced with larger CHF value and the integrity of cladding can be maintained during quenching process. However, research on transient quenching CHF behavior is extremely limited in literature, not to speak of combined quenching in narrow rectangular channel. Considered that quenching CHF mechanism may be totally different from that during heating process, experimental and mechanical researches were conducted comprehensively on combined/bottom quenching CHF behavior in this article. During combined quenching, bottom injection portion plays a dominant role because major top injection may be expelled due to counter current flow limitation (CCFL) in narrow rectangular channel. Besides, boundary conditions such as injection methods, inlet subcooling, pressure and heating power have strong effect on CHF behavior. Based on visualization results, mechanism of quenching CHF can be attributed to dryout of liquid sublayer beneath coalesced bubble. The newly proposed model can match well with experimental data (RMS error 22.24%), and the relevant findings are important for safety operation of plate-type fuel reactor and also can be applied in other industrial scenes where quenching phenomenon are encountered
Year of publication: |
[2022]
|
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Authors: | Xu, Wei ; Ouyang, Kun ; Deng, Yonghao ; Liu, Xiaojing |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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