Mechanism model of critical heat flux in narrow rectangular channel based on flow oscillations

被引：0

作者：

Yan M. ^{[1
]}

Deng J. ^{[2
]}

Pan L. ^{[1
]}

Ma Z. ^{[1
]}

Li X. ^{[1
]}

Deng J. ^{[2
]}

He Q. ^{[1
]}

机构：

[1] Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing

[2] Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Sichuan, Chengdu

来源：

Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 07期

关键词：

bubble; flow regime; narrow rectangular channel; PM-CHF; two-phase flow;

D O I：

10.11949/0438-1157.20220178

中图分类号：

学科分类号：

摘要：

The maximum operating power of the device is limited by the critical heat flux (CHF), however, the flow oscillation can cause premature critical heat flux (called PM-CHF) and reduce the stable operating range. In order to study the critical heat flux in a narrow rectangular channel under flow oscillation conditions, this paper conducted experiments to visualize the boiling crisis in a narrow rectangular channel under vertical upward flow condition with deionized water as the working medium, with mass flux range of 350—2000 kg/(m2·s), narrow gap size range of 1—5 mm, and system pressure range of 1—4 MPa. The results show that CHF increases linearly with increasing mass flow rate in the narrow rectangular channel. The flow oscillation occurs when the mass flux is small, and the oscillation period is about 0.1 s. The flow oscillation leads to the early onset of boiling crisis, during which the flow pattern is slug-churn flow. Based on the flow oscillation and the bubble dynamics characteristics in the narrow rectangular channel, the theoretical analysis and derivation are carried out from the perspective of flow oscillation. In results, a PM-CHF mechanism model is established, and the error is within 30%. © 2022 Chemical Industry Press. All rights reserved.

引用

页码：2962 / 2970

页数：8

共 33 条

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