文献类型：期刊文献

英文题名：Erosion Investigation of Dimple Wall Using Erosion-Coupled Dynamics Mesh

作者：Ren, Libo[1]; Long, Xiangyi[2]; Wang, Xiaowei[1]; He, Hailan[1]; Zhang, Manli[1]; Lu, Hao[2]

机构：[1] Shanghai Heat Transfer Equipment CO., LTD, Shanghai, 201508, China; [2] School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230034361)

语种：英文

外文关键词：Computational fluid dynamics - Computer software - Erosion - Heat exchangers - Mesh generation

摘要：The erosion of dimple walls is investigated experimentally and numerically. By adopting the Fluent software and user-defined function (UDF), we proposed a mathematical simulation framework, named computational fluid dynamics (CFD)-discrete phase model (DPM) -erosion-coupled dynamic mesh. Simulation results suggest that our numeric simulation framework is able to describe the morphological evolution of the dimple wall quantitatively. Regardless of the evolution of the dimple wall shape, the maximum region of wall shear, mesh deformation, and erosion rate will always be on the dimple windward wall surface that intersects the flat wall surface. As the wall shape continues evolving, the wall shear stress, mesh deformation, and erosion rate would decrease and gradually tend to be constant. Two distinct regions have been identified along the dimple's windward wall surface: the wall's central area and the lateral area. In the central region, the wall profile flare occurs mainly in the early stage. In the lateral region, profile flare occurs mainly in the later stages of erosion. The mesh deformation evolution process does not coincide with the wall thickness evolution process, mainly because the wall mesh does not always move in the normal direction of the initial wall surface. The microhardness of the wall surface shows a positive correlation with the erosion rate. The liquid-solid two-phase impinges on the wall at a smaller angle, and the wall material removal process is mainly based on the micro-cutting and slip mechanism. The results provide theoretical implications for the design of dimple-shaped wide-channel welded plate heat exchangers. ? 2023, The Authors. All rights reserved.