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研究生: 度山曼
Abdul Samad
論文名稱: 積層製造 Gyroid 熱交換器之設計及其性能評估研究
Design and performance evaluation of additively manufactured Gyroid heat exchanger
指導教授: 賴維祥
Lai, Wei-Hsiang
學位類別: 碩士
Master
系所名稱: 工學院 - 航空太空工程學系
Department of Aeronautics & Astronautics
論文出版年: 2022
畢業學年度: 110
語文別: 英文
論文頁數: 104
中文關鍵詞: Gyroid熱交換器Ansys FluentnTop積層製造
外文關鍵詞: Gyroid, Heat Exchanger, 3D Printing, Ansys Fluent, nTop
相關次數: 點閱:37下載:2
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  • 在現代技術中,重量輕、節省空間和高性能熱交換器是高度要求的。汽車和航空航天行業對這種熱交換器的需求很大。本研究在 CAD 軟體(nTop)和選擇性雷射熔化(SLM)技術中執行Gyroid熱交換器模型設計和3D 列印。利用Ansys和SolidWorks的電腦模擬以及感測器的實驗數據已經成功的完成。由數值模擬結果和原型實驗結果比較來優化Gyroid熱交換器設計。重量减少了 87.21%,孔隙率计算为 82.29%。,与板框 HEX 的 Gyroid HEX 相比,由于表面对 - 的增加,效率提高到 33.33%,整体传热系数提高到 75.19%。体积比为 61.81%。這些確認了新Gyroid 熱交換器卓越的性能,提供最大的傳熱表面在較小的體積和更緊緻的空間效率,故在航太和汽車工業都是很有潛力的應用領域。

    Lightweight, space-saving, and high-performance heat exchangers are highly required in modern technologies. There are significant needs for this heat exchanger in the automotive and aerospace industries. The Gyroid heat exchanger model is designed in CAD software (nTop platform and SolidWorks) and 3D printing from selective laser melting (SLM) technology. Computer simulation from Ansys and SolidWorks software as well as experimental data from sensors have been carried out successfully. Numerical simulation results and prototype experimental results are compared, and finally this result is feedbacked to SolidWorks to optimize Gyroid heat exchanger design accordingly.
    Several novel features are observed in the Gyroid heat exchanger, weight is decreased by 87.21% and the porosity is calculated as 82.29%., When compared to Gyroid HEX with plate and frame HEX, effectiveness increased to 33.33% and overall heat transfer coefficient increased to 75.19% due to the increase of surface-to-volume ratio by 61.81%. In addition, pressure loss is reduced, and overall performance has improved. These confirm the novel Gyroid heat exchanger covering extraordinary performance, providing a maximum heat transfer surface in a smaller space, and more compactness are feasible for aerospace and automotive industries.

    摘要 I Abstract II Acknowledgment III Table of Contents IV List of Tables VIII List of Figures IX Nomenclature XII Chapter 1. Introduction 1 1.1 Motivation 1 1.2 Triply Periodic Minimal Surfaces (TPMS) 1 1.3 Additive Manufacturing 5 1.4 Heat Exchanger 8 1.5 Regenerators and Recuperators 9 1.5.1 Recuperator 9 1.5.2 Recuperator for Combustion Engine 10 Chapter 2. Literature Survey and Methods 11 2.1 Basic Theoretical Design Calculation Methods of Heat Exchanger 12 2.2 Governing Equation 12 2.3 Pressure Drop 13 2.4 The Overall Heat Transfer Coefficient 14 2.5 Thermal Design for Heat Exchanger 15 2.6 The LMTD Method 15 2.7 The ε – NTU Method 16 2.8 Information Gathering 18 2.9 Concept Generation 18 2.10 Realization 18 2.11 Compactness 18 2.12 Cocurrent Flow 19 2.13 Countercurrent Flow 19 2.14 Crossflow and Mixing 20 2.15 Classification According to Design and Construction Features 20 2.16 Tubular 21 2.17 Shell & Tube Heat Exchanger 21 2.18 Coil Heat Exchanger 22 2.19 Double Pipe Heat Exchanger 23 2.20 Plate 24 2.21 Plate Heat Exchanger (PHE) 24 2.22 Plate & Shell Heat Exchanger 27 2.23 Printed Circuit Heat Exchanger 28 2.24 TPMS 29 2.25 Schwartz P Heat Exchanger (Primitive surface) 29 2.26 Gyroid Heat Exchanger 31 2.27 Diamond Heat Exchanger (D surface) 33 Chapter 3. Problem Statement 35 3.1 Problem Identification 35 3.2 Significance of the Project 36 Chapter 4. Gyroid Heat Exchanger Design Method 37 4.1 Heat Exchanger Design 39 4.4 Gyroid Heat Exchanger Properties 47 4.1 Transport Properties of Gyroid 50 4.2 Mechanical Properties of Gyroid 51 4.3 Mechanical Analysis Method 52 4.4 Thermal Analysis Method 54 Chapter 5. Finite Element Modeling 57 5.1 CFX Analysis 59 5.2 Fluent Analysis 61 Chapter 6. Manufacturing 64 Chapter 7. Fabrication and Experimental Setup 65 7.1 Fabrication 65 7.2 Experimental Setup 66 Chapter 8. Results and Discussions 68 8.1 Gyroid Heat Exchanger Design 68 8.2 Gyroid Heat Exchanger Manufacturing 70 8.3 Experiments 72 8.4 Simulations 73 8.4.1 Simulation with PLA material 73 8.5 Calculations of Gyroid HEX with PLA Material 77 8.5.1 Logarithmic Mean Temperature Difference (LMTD) 78 8.5.2 Rate of Heat Transfer (Q) 78 8.5.3 Maximum Temperature Difference 78 8.5.4 Maximum Possible Heat Transfer Rate 78 8.5.5 Effectiveness ε 78 8.5.6 Overall Heat Transfer Coefficient 79 8.5.7 Thermal Length (ϴ) 79 8.5.8 Capacity Ratio (C) 79 8.5.9 Pressure Drops (△P) 79 8.5.10 Thermal Resistance (Analytical calculations) 80 8.5.11 Temperature Distribution in Plate, T(x) 81 8.5.16 Nondimensional Number 83 8.6 Calculations of Gyroid HEX with SS316 Material 84 8.7 Calculations of Plate Heat Exchanger with SS316 Material 87 Chapter 9. Conclusions 91 9.1 Conclusions 91 9.2 Future Research 91 References 93 Appendix 98

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