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عدد المساهمات : 18660 التقييم : 34550 تاريخ التسجيل : 01/07/2009 الدولة : مصر العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
| موضوع: مشروع تخرج بعنوان The Optimization Model of Composite Pin Fins الأربعاء 24 أغسطس 2016, 6:09 pm | |
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ويتناول الموضوعات الأتية :
CHAPTER 1 INTRODUCTION 1 1 1 INTRODUCTION 1 1 2 MOTIVATION AND BACKGROUND 3 1 3 NEED FOR RESEARCH 3 1 4 OVERLOOK TO THERMALLY CONDUCTIVE COMPOSITES 5 1 5 HIGH THERMAL CONDUCTIVITY POLYMER MATRIX COMPOSITES 7 Polymer Matrix 9 Carbon fibers 12 1 6 ENHANCED THERMAL CONDUCTIVITY POLYMERIC MATERIALS 14 CHAPTER 2 HEAT TRANSFER THROUGH EXTENDED SURFACES 15 2 1 INTRODUCTION 15 2 2 OVERLOOK TO HEAT TRANSFER 15 Conduction 15 Convection 15 Radiation 16 2 3 HEAT TRANSFER THROUGH FINS 16 Overlook to fins 16 Industrial applications of fins 17 Fin materials 18 Fin configurations 19 Heat sink selection methodology in electronic cooling 21 Rules for choosing or designing a heat sink 21 Basic Types of fins 23 Fin manufacturing technique 27 2 4 DEFINING TERMS 28 CHAPTER 3 LITERATURE REVIEW 31 3 1 INTRODUCTION 31 3 2 RECENT RESEARCHES 31 3 3 HEAT TRANSFER IN FINS, AND COMPLEX, DIFFERENT GEOMETRIES 35 3 4 ELECTRONIC PACKAGING 35 3 5 HEAT TRANSFER ENHANCEMENT 35 CHAPTER 4 THERMAL PERFORMANCE AND OPTIMIZATION OF NATURAL CONVECTION PPS COMPOSITE PIN FIN HEAT SINKS 36 4 1 INTRODUCTION 36 4 2 FEA BASIC CONCEPTS OF MODELLING USING FEA 36 Why FEA? 37 Finite Element Applications in Engineering 38 FEA with ANSYS Icepack 39 A General Procedure for FEA 41 Benefits of simulation modeling and analysis: 42 4 3 WATER COOLED NATURAL CONVECTION PPS PIN FIN 43 Building the model 43 Generate Mesh 45 Boundary conditions and loads 45 Solution Procedure 48 Results and discussion 54 4 4 THERMAL PERFORMANCE OF NATURAL CONVECTION PPS INLINE PIN FIN HEAT SINKS 54 Cabinet modelling 55 Motherboard PCB modelling 56 CPU assembly modelling 57 Capacitors modelling 57 Heat sink modelling 58 Generate mesh 58 Meshing steps 59 Solution procedure 61 Results and post processing 64 4 5 INLINE AND STAGGERED HEAT SINK CONFIGURATION 66 4 6 HEAT SINK OPTIMIZATION 68 Optimization procedure 68 Defining the design variables and constraints 68 Effect of fin radius (1 5 – 1 8mm) on thermal resistance 70 Effect of fin height (3 – 6cm) on thermal resistance 70 Effect of number of fins in row (6 – 12) on thermal resistance 71 Effect of array heat transfer coefficient (ha) on fin height 71 Effect of mass based heat transfer coefficient (hm) on fin height 73 Effect of space-claim heat transfer coefficient (hsc) on fin height 74 4 7 DEFINING TERMS 74 Array heat transfer coefficient, ha 74 Thermal resistance, Rhs 75 Mass Based Heat Transfer Coefficient, hm 75 Space claim heat transfer coefficient, hsc 75 4 8 PIN FIN EQUATIONS 76 4 9 PIN FIN ARRAY ANALYSIS WITH FIN DENSITY 79 Numerical results substantiate analytical modeling results for heat sinks within the Aihara et al [45] fin density range 80 CHAPTER 5 CONCLUSION 82 5 1 INTRODUCTION 82 5 2 OPTIMUM PIN FIN RADIAL THERMAL CONDUCTIVITY VALUE 83 5 3 PPS COMPOSITE PIN FIN NATURAL CONVECTION HEAT SINK THERMAL PERFORMANCE 83 5 4 PPS COMPOSITE PIN FIN FORCED CONVECTION HEAT SINK THERMAL PERFORMANCE 84 5 5 NOTES ON RESULTS 84 5 6 FUTURE SCOPE 85 Anisotropic Pin Fin Modeling 85 Mechanical strength 85 REFERENCES……… 86 MODELLING AND OPTIMIZATION OF POLYMER COMPOSITE PIN FIN 90 APPENDIX A PHYSICAL PROPERTIES OF VARIOUS MATERIALS 105 APPENDIX B MECHANICAL PROPERTIES OF VARIOUS MATERIALS 108 APPENDIX C TYPICAL PROPERTIES OF REINFORCING FIBERS 110 Figure 1 1 PPS composite staggered pin fin array [4] 4 Figure 1 2 Formation of a composite material using fibers and resin 5 Figure 1 3 Continuous fiber and short fiber composites 8 Figure 1 4 Schematic illustration of polymer chains 9 Figure 1 5 Polymer chains in (a) amorphous (b) semi-crystalline polymer [20] 10 Figure 1 6 Longitudinal thermal conductivity of carbon fiber filled composite [21] 11 Figure 1 7 Carbon fiber volume consumption and prices [17] 14 Figure 2 1 A finned heat sink and fan assembly (left) and microprocessor (right) 17 Figure 2 2 Fin configurations (a) Straight fin of uniform cross section (b) Straight fin of non-uniform cross section (c) Annular fin (d) Pin fin 19 Figure 2 3 Plate fin terminology 20 Figure 2 4 Inline pin fin terminology 20 Figure 2 5 Various types of heat sinks 21 Figure 2 6 Plate fin heat sinks 23 Figure 2 7 Cold-forged round-pin heat sinks 24 Figure 2 8 Cold-forged elliptical pin heat sinks 25 Figure 2 9 Cross-cut aluminum heat sink 26 Figure 2 10 Fin array (a) Fins are integral with the base (b) Fins are attached to the base27 Figure 2 11 Extruded straight fin heat sink 27 Figure 4 1 Objects built with simple and small pieces: (a) A fire engine built with LEGO; and (b) A house built with many elements—bricks, beams, columns, panels 37 Figure 4 2 A sketch of the computer-aided product development process 38 Figure 4 3 Velocity streamlines colored by fan for a card array in a VME format box cooled by 3 axial fans, image created using ANSYS CFD-Post 40 Figure 4 4 A plate with a hole (CAD model); and (b) A FEM discretization (mesh) 41 Figure 4 5 Top view of PPS composite pin fin 43 Figure 4 6 Rectangular dimensions 45 Figure 4 7 Defining array parameter HF 46 Figure 4 8 Heat transfer coefficient table 46 Figure 4 9 Applying convection load 47 Figure 4 10 Temperature contour of the fin 48 Figure 4 11 Defining path to obtain temperature distribution 0 5 cm above the fin base 49 Figure 4 12 First point of path low TC 49 Figure 4 13 Second point of path low TC 50 Figure 4 14 Defining path to obtain temperature distribution 3 5 cm above the fin base 50 Figure 4 15 First point of path Mid TC 50 Figure 4 16 Second point of path Mid TC 51 Figure 4 17 Defining path to obtain temperature distribution 7 5 cm above the fin base 51 Figure 4 18 First point of path TOP TC 51 Figure 4 19 Second point of path TOP TC 52 Figure 4 20 Numerical temperature distribution at PPS composite pin fin locations 53 Figure 4 21 Validation curve for a heat transfer rate of 27 4 W (kz= 13 W/m K, Kr= 2 W/m K) Figure 4 22 Schematic illustration of the 3D chassis model 55 Figure 4 23 Cabinet boundary conditions 56 Figure 4 24 Meshing parameters 59 Figure 4 25 Top view of 3D chassis meshing 60 Figure 4 26 Isometric view of 3D chassis meshing 60 Figure 4 27 Basic parameters specification 63 Figure 4 28 Basic settings of solution 63 Figure 4 29 Temperature contour using PPS heat sink (k=20 W/mK) 64 Figure 4 30 Temperature contour using copper heat sink (k=400W/mK) 65 Figure 4 31 Temperature contour using aluminum heat sink (k=200W/mK) 65 Figure 4 32 Temperature variation along axial distance of the pin fin 66 Figure 4 33 Temperature contour for inline PPS heat sink 66 Figure 4 34 Temperature contour for staggered PPS heat sink 67 Figure 4 35 Cooling rates of staggered and inline pin fin configuration 67 Figure 4 36 Parameters and optimization settings 69 Figure 4 37 Effect of Pin Fin Radius on Thermal Resistance 70 Figure 4 38 Effect of Pin Fin Height on Thermal Resistance 70 Figure 4 39 Effect of number of fins on thermal resistance 71 Figure 4 40 Natural Convection Array Heat Transfer Coefficient Variation with Fin Conductivity and Height – Optimally Spaced Fins (L= 0 1m, W = 0 1m, θb=25K) 72 Figure 4 41 Mass-specific heat transfer coefficient variation with pin fin height, thermal conductivity and diameter for aluminum and PPS heat sinks 73 Figure 4 42 Pin fin hsc for enhanced PPS and aluminum in natural convection 74 Figure 4 43 Staggered pin fin heat sink 76 Figure 4 44 Enhanced PPS pin fin ha variation with fin density in natural convection 80 Figure 4 45 Enhanced PPS hm variation with fin density in natural convection 81 Table 1 1 Polymer composite properties 2 Table 1 2 Thermal conductivity of various composites 6 Table 1 3 Advantages/disadvantages of PMC’s 7 Table 1 4 Thermal conductivity of various materials 8 Table 1 5 Characteristics of amorphous polymers 10 Table 1 6 Recommended polymers for heat exchanger applications [106, 107] 11 Table 1 7 Selection criteria for polymer resins 12 Table 1 8 Thermal properties of pitch based carbon fiber [1] 13 Table 2 1 Advantages and limitations of fins 18 Table 4 1 Examples of engineering applications using FEA 39 Table 4 2 Dimensions of the specimen 44 Table 4 3 Fin material properties 44 Table 4 4 Temperature measurement (numerical results) from path Low TC, Mid TC, Top TC at 27 4W 52 Table 4 5 Cabinet dimensions 55 Table 4 6 Motherboard PCB Modelling 56 Table 4 7 Physical properties of FR-4_Ref Material 56 Table 4 8 CPU cabinet dimensions 57 Table 4 9 Socket dimensions 57 Table 4 10 Capacitors dimensions 57 Table 4 11 Physical properties of the ceramic material 57 Table 4 12 Heat sink dimensions 58 Table 4 13 Physical properties of PPS material
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عدد المساهمات : 2 التقييم : 2 تاريخ التسجيل : 24/04/2016 العمر : 27 الدولة : مصر العمل : طالب الجامعة : المنوفية
| موضوع: رد: مشروع تخرج بعنوان The Optimization Model of Composite Pin Fins الأربعاء 24 أغسطس 2016, 7:45 pm | |
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Admin مدير المنتدى
عدد المساهمات : 18660 التقييم : 34550 تاريخ التسجيل : 01/07/2009 الدولة : مصر العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
| موضوع: رد: مشروع تخرج بعنوان The Optimization Model of Composite Pin Fins الخميس 01 سبتمبر 2016, 10:29 pm | |
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