Fast transient heat transfer by sinusoidal pulse power

被引：0

作者：

Kam D.H. ^{[1
,2
]}

Jung S. ^{[1
]}

Kang J.-Y. ^{[1
]}

Hong S. ^{[1
]}

Choi Y.-S. ^{[1
]}

Jeon B.G. ^{[1
]}

Park J.-K. ^{[1
]}

Moon S.-K. ^{[1
]}

机构：

[1] Korea Atomic Energy Research Institute, Daedeok-Daero 989-111, Yuseong-Gu, Daejeon

[2] Argonne National Laboratory, 9700 S. Cass Ave, Argonne, 60439, IL

来源：

International Communications in Heat and Mass Transfer | 2023年 / 140卷

基金：

新加坡国家研究基金会;

关键词：

CHF; Explosive boiling; Fast transient; Pulse power; RIA; Transient heat transfer;

D O I：

10.1016/j.icheatmasstransfer.2022.106508

中图分类号：

学科分类号：

摘要：

In nuclear reactors, sudden ejection of control rods, reactivity-initiated accident (RIA), can incur pulse power and threaten the reactor safety. On this basis, the effect of pulse power shape has been thoroughly assessed in this study considering rapid negative feedbacks in reactor cores. Overall tendency dramatically changes when the power supply rate becomes very fast. Especially for the high amplitude with long sustenance under fast transient conditions, heat transfer performance can be enormously enhanced. A synchronized high-speed camera has been used to visualize the nucleation and vapor dynamics. The fast transient condition shows highly increased nucleation sites and even nucleation-induced vapor blanket along the wire. Fast transient input power shows receding behavior of the merged blanket generating stable films, and heat transfer further enhances when the high amplitude condition is sustained. Some conditions show insufficiency of power input, which leads to low heat transfer performance. The amplitude of input power plays a crucial role, while both the amplitude and the sustenance period determine the overall trends under fast transient conditions. Enhanced heat transfer under fast transient conditions may effectively secure the safety margin, even though local surface temperature, where stable vapor film is located, could cause some negative results on the integrity. © 2022

引用

共 26 条

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