Abstract This study presents the development of an experimental procedure to validate a novel computational fluid dynamics (CFD) model that was presented in a previous study. This model reproduces the fouling phenomenon caused by soot particles inside exhaust gas recirculation (EGR) coolers. The aim of this study is to verify the model results by using a numerical tool to improve the study of deposits created inside EGR coolers. By employing an experimental layout that emulates dry soot fouling, the deposit formation and evolution are recreated inside three probes designed ad hoc to enable local thickness measurements. An optical profiler is used to determine the topography of the soot deposit, thereby circumventing destructive tests. A sequential validation process is conducted by comparing the actual fouling profiles and the CFD results at different instants of the test. The results obtained under the studied conditions reveal that on average, 73.4% of the area analysed exhibits a low level of relative error. This verifies that the proposed model and its numerical implementation constitute a valuable tool for studying the performance of heat exchangers exposed to fouling.

中文翻译：

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EGR 干烟尘条件下肋状表面的污垢演变：实验测量和 3D 模型验证

摘要 本研究介绍了一种实验程序的开发，以验证先前研究中提出的新型计算流体动力学 (CFD) 模型。该模型再现了由废气再循环 (EGR) 冷却器内的烟尘颗粒引起的结垢现象。本研究的目的是通过使用数值工具来验证模型结果，以改进对 EGR 冷却器内部产生的沉积物的研究。通过采用模拟干烟尘污染的实验布局，在三个专门设计的探头内重新创建沉积物的形成和演变，以实现局部厚度测量。光学轮廓仪用于确定烟灰沉积物的形貌，从而避免破坏性测试。通过在测试的不同时刻比较实际的污垢分布和 CFD 结果来进行顺序验证过程。在研究条件下获得的结果表明，平均 73.4% 的分析区域表现出低水平的相对误差。这验证了所提出的模型及其数值实现构成了研究暴露于污垢的换热器性能的宝贵工具。