Heat transfer transition of fuel rod caused by CRUD growth

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-09-12 DOI:10.1016/j.ijthermalsci.2025.110268

Guolian Wang , Yan Liu , Xiaojing Liu , Xiang Chai , Tengfei Zhang , Hui He

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引用次数: 0

Abstract

Whether the growth of corrosion-related unidentified deposit (CRUD) layer on fuel rod cladding enhancing or deteriorating heat transfer is still unclear due to the harsh reactor core environment, complex CRUD micro-structures as well as internal boiling. This study investigates the process of CRUD growth over a fuel cycle under varying operational conditions and builds a database encompassing heat transfer coefficient, morphological features, CRUD interior and surface thermal resistances. Based on the database, a heat transfer model by considering CRUD in terms of boiling number, chimney area and Darcy number is developed through parameter sensitivity analysis and multiple linear regression, and the relative error is within ±12 %. By comparing the heat transfer coefficients between CRUD-covered rod and bare rod, the heat transfer transition caused by CRUD growth can be predicted concisely and intuitively. Overall, the increase of CRUD interior thermal resistance gradually counteracts the boiling enhancement effect of CRUD porous morphology, leading to a transition from enhanced to deteriorated heat transfer.

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CRUD生长引起的燃料棒传热转变

由于堆芯环境恶劣、CRUD微结构复杂以及内部沸腾等原因，尚不清楚燃料棒包壳上腐蚀相关未识别沉积物（CRUD）层的生长是增强传热还是恶化传热。本研究考察了在不同操作条件下燃料循环中CRUD的生长过程，并建立了一个包含传热系数、形态特征、CRUD内部和表面热阻的数据库。在此基础上，通过参数敏感性分析和多元线性回归，建立了考虑沸腾数、烟囱面积和达西数的CRUD换热模型，相对误差在±12%以内。通过对比覆油杆与裸油杆的换热系数，可以简洁直观地预测出覆油杆生长引起的换热转变。总体而言，CRUD内部热阻的增加逐渐抵消了CRUD多孔形态的沸腾强化作用，导致传热由强化向恶化转变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.