Transient thermal–hydraulic modeling of a leakage in a horizontal concentric heat exchanger with RELAP5 and ANSYS-CFX

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-09-12 DOI:10.1016/j.tsep.2025.104098

A.L. Deghal Cheridi, M. Boumaza, B. Mohammedi

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引用次数: 0

Abstract

Heat exchangers are a fundamental component in several plants due to their compact design, high efficiency and significant economic role, as most thermal energy produced or transferred within an installation passes through them. However, unexpected transient conditions, such as fluctuations in flow rates or temperatures, can significantly affect system performance, safety and efficiency. Therefore, understanding their thermal–hydraulic behavior under accidental transient conditions is crucial for process control and to assess their impact on plant components. This study aims to analyze the thermal–hydraulic response of a horizontal concentric tube heat exchanger during a leak scenario. A combined modeling approach was employed, using Relap5 for global thermal–hydraulic analysis and Ansys-CFX for local flow and heat transfer phenomena.The heat exchanger model was developed and validated against experimental data from the literature under both steady-state and transient conditions in counter-current and co-current configurations, showing strong agreement. Simulation results demonstrate that the codes effectively capture the dynamic evolution of key parameters and reveal the significant impact of leakage on flow structure and heat transfer performance. Moreover, this study provides valuable insights for safety assessment, operational control, and system optimization in thermal engineering applications.

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基于RELAP5和ANSYS-CFX的卧式同心换热器泄漏瞬态热工模型

热交换器由于其紧凑的设计，高效率和重要的经济作用，在许多工厂中是一个基本的组成部分，因为在一个装置中产生或转移的大部分热能都要经过它们。然而，意外的瞬态条件，如流量或温度的波动，会严重影响系统的性能、安全性和效率。因此，了解它们在意外瞬态条件下的热水力行为对于过程控制和评估它们对工厂组件的影响至关重要。本研究旨在分析泄漏情况下卧式同心管换热器的热液响应。采用组合建模方法，使用Relap5进行全局热水力分析，使用Ansys-CFX进行局部流动和传热现象分析。根据文献中的实验数据，建立了换热器模型，并在稳态和瞬态条件下，在逆流和共流配置下进行了验证，显示出很强的一致性。仿真结果表明，这些代码有效地捕捉了关键参数的动态演变，揭示了泄漏对流动结构和传热性能的显著影响。此外，该研究还为热工应用中的安全评估、运行控制和系统优化提供了有价值的见解。

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

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.