NUCLEAR TECHNIQUES, Volume. 45, Issue 10, 100604(2022)

A new CHF mechanism model for a narrow rectangular channel based on bubble dynamics characteristics

Meiyue YAN1,2, Liangming PAN1,2、*, Zaiyong MA1,2, Xiang LI1,2, and Lingfeng WAN1,2
Author Affiliations
  • 1Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, China
  • 2Department of Nuclear Engineering and Technology, Chongqing University, Chongqing 400044, China
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    Narrow rectangular channels are widely used in major thermal flow fields because of the compact structure and large heat transfer area.


    This study aims to improve the prediction method of critical heat flux in the narrow rectangular channel and establishing the critical heat flux (CHF) mechanism model for the enhancement of reactor safety and economy.


    CHF experiments was carried out in the present study to identify the dominant mechanism in a narrow rectangular channel at different gap sizes. The visualization experiments were performed at pressures ranging from 1 MPa to 4 MPa, inlet subcooling from 60 K to 120 K, and mass flux from 350 kg·(m2·s)-1 to 2 000 kg·(m2·s)-1.


    According to the visual experiment results, two typical bubble behaviors are investigated in the narrow rectangular channel. Based on the bubble dynamics characteristics of narrow rectangular channels, a new CHF mechanism model was proposed, and a set of constitutive relations will be provided to close the developed model.


    A comprehensive assessment of new model has been conducted and analyzed by using the experimental data for the upward flow in a vertical narrow rectangular channel and it has good accuracies of less than ±30% as relative to the experimental values.


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    Meiyue YAN, Liangming PAN, Zaiyong MA, Xiang LI, Lingfeng WAN. A new CHF mechanism model for a narrow rectangular channel based on bubble dynamics characteristics[J]. NUCLEAR TECHNIQUES, 2022, 45(10): 100604

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    Paper Information

    Category: Research Articles

    Received: Mar. 10, 2022

    Accepted: --

    Published Online: Nov. 4, 2022

    The Author Email: PAN Liangming (



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