Numerical Investigation on Thermal Fatigue Damage Mechanism of Head Structures in Aluminum Plate-Fin Heat Exchangers

Ma, Hongqiang; Wang, Jiajun; Chen, Hailiang; Bai, Jihua; Cai, Weihua; Wang, Shengxun; Ding, Ruixiang

doi:10.1007/s11665-023-08924-z

Cited by 1 publication

(1 citation statement)

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“…), which may, in real structures, more or less differ if compared to the standardised test conditions. For comparison, Hayta et al [32] used a value of 0.8, while Ma et al [34] considered the value 0.3. Therefore, it is crucial to underscore that direct comparisons of computational results between different studies are questionable because of different assumptions regarding strength reduction factors and also due to the unique geometries inherent to each numerical model.…”

Section: Computational Analyses Of the Plate Heat Exchangermentioning

confidence: 99%

Fatigue Behaviour of Brazed Joints for Heat Exchangers

Hanželič,

Kralj,

Bončina

et al. 2024

Materials

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The plate heat exchanger (PHE) is a component that provides heat to be transferred from hot water to domestic cold water without mixing them with high efficiency. Over the lifetime of the PHE, cyclic pressures act on the brazing points and the plates, and this may lead to fatigue failure. The fatigue behaviour of the PHE, designed using copper-brazed 316L stainless steel, was investigated in this study. First, the fatigue tests under the load ratio R = 0.1 were performed on the Vibrophore 100 testing machine to obtain the S-N curve of the analysed brazed joint. Based on the obtained experimental results, an appropriate material model of the analysed brazed joint has been created, which was validated with numerical calculation in the framework of a program code Ansys. A validated material model was then used for the subsequent numerical analysis of PHE. In order to carry out a numerical calculation using the finite element method (FEM), a three-dimensional model of the heat exchanger was created based on the previous scanning of PHE-geometry. Thereafter, the geometry was parameterised, which allowed us to perform parametric simulations (monitoring different responses depending on the input geometry). Numerical simulations were carried out in the framework of the Ansys 2023-R1 software, whereby the obtained results were analysed, and the responses were appropriately characterised according to previously determined load cases.

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Section: Computational Analyses Of the Plate Heat Exchangermentioning

confidence: 99%