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Research Papers: Design and Analysis

Study of Parameter Effects on Residual Stresses and Thermal Deformation of Brazed Plate-Fin Structure Using Finite Element Method

[+] Author and Article Information
Hu Chen

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, 210009 China; Technical Development Department, Ningbo Special Equipment Inspection Center, Ningbo, 315020 Chinachh025@163.com

Jian-Ming Gong

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, 210009 Chinagongjm@njut.edu.cn

Shan-Tung Tu

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, 210009 Chinasttu@njut.edu.cn

Lu-Yang Geng

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, 210009 Chinayoung@njut.edu.cn

J. Pressure Vessel Technol 130(4), 041202 (Aug 20, 2008) (6 pages) doi:10.1115/1.2967740 History: Received May 04, 2006; Revised May 11, 2007; Published August 20, 2008

The brazed plate-fin structure is the key component of a compact plate-fin heat exchanger. The residual stresses and thermal deformation induced by vacuum brazing may bring negative effects on the quality and the life of the plate-fin structure. Thus, it is important to optimize the brazing parameters in order to minimize such effects. This paper presents a three-dimensional finite element analysis for determining the residual stresses and thermal deformation of a three layered stainless steel plate-fin structure fabricated by nickel-based brazing. The features of residual stresses and thermal deformation distribution are discussed. The effects of three major brazing parameters including brazing temperature, clamping pressure load, and filler metal on the residual stresses and thermal deformation are investigated, respectively.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cross-flow plate-fin structure

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Figure 2

Configuration of three-layer plate-fin structure

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Figure 3

Schematic of typical procedure for vacuum brazing PFHE (7)

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Figure 4

Residual stress contours of brazed plate-fin structure in three principal stress dimensions (Tb, 1100°C, Pc: 0.5MPa, Nfm: BNi-2)

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Figure 5

Shear and normal stress variation along two interfaces of brazed joint (Tb, 1100°C; Pc, 0.5MPa; Nfm, BNi-2)

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Figure 6

Thermal deformation profile (Tb, 1100°C; Pc, 0.5MPa; Nfm, BNi-2; dash line outlines original structure; deformation scale: 3).

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Figure 7

Brazing temperature effect (Tb, variable; Pc, 0.5MPa; Nfm, BNi-2)

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Figure 8

Clamping pressure load effect (Tb, 1100°C; Pc, variable; Nfm, BNi-2; negative U denotes that the structure is compressed by Pc)

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