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List of Symbols | ||
Preface | ||
1 | Natural Form, Questioning, and Theory | 1 |
1.1 | The Great Puzzle: From What Principle can Geometric Form be Deduced? | 1 |
1.2 | The Hardest Questions | 4 |
1.3 | The Objective and Constraints Principle | 6 |
2 | Mechanical Structure | 14 |
2.1 | Cantilever Beam: Objective and Constraints | 14 |
2.2 | External Shape | 16 |
2.3 | Internal Structure | 18 |
2.4 | Shape and Structure, Together | 20 |
2.5 | Column in End Compression | 22 |
2.6 | The Concept of "Better" | 24 |
3 | Thermal Structure | 29 |
3.1 | Cooling Electronics: Objective and Constraints | 29 |
3.2 | Volume Cooled by Natural Convection | 29 |
3.3 | Volume Cooled by Forced Convection | 35 |
3.4 | The Method of Intersecting the Asymptotes | 40 |
3.5 | The Balance between Stream-Travel Time and Diffusion Time | 41 |
3.6 | Optimal Longitudinal Flow Pulsations | 42 |
3.7 | From Constructal Principle to Internal Structure | 44 |
3.8 | Cracks in Shrinking Solids | 45 |
4 | Heat Trees | 52 |
4.1 | The Volume-to-Point Flow Problem | 52 |
4.2 | Elemental Volume | 53 |
4.3 | First Construct and Growth | 56 |
4.4 | Second and Higher-Order Constructs | 58 |
4.5 | Constructal Law | 60 |
4.6 | Tapered Channels and Optimal Angles | 62 |
4.7 | Three-Dimensional Heat Trees | 65 |
4.8 | Time-Dependent Discharge from a Volume to One Point | 67 |
4.9 | Constructal Design: Increasing Complexity in a Volume of Fixed Size | 69 |
4.10 | Design with Unrestricted Elemental Features | 74 |
4.11 | Constructal Heat Trees Are Robust | 77 |
5 | Fluid Trees | 82 |
5.1 | Bathing a Volume: Objective and Constraints | 82 |
5.2 | Elemental Volume | 84 |
5.3 | First and Higher-Order Constructs | 88 |
5.4 | Channels with Hagen-Poiseuille Flow | 91 |
5.5 | Optimization of Void-Space Distribution | 92 |
5.6 | Constructal Design: Increasing Complexity in a Volume of Fixed Size | 94 |
5.7 | Three-Dimensional Fluid Trees | 99 |
5.8 | Scaling Laws of Living Trees | 108 |
6 | Ducts and Rivers | 117 |
6.1 | Geometric Puzzles | 117 |
6.2 | Optimal River Channel Cross Sections | 122 |
6.3 | Optimal Duct Cross Sections | 127 |
6.4 | Deterministic River Drainage Basins | 128 |
6.5 | River Basins with Randomly Distributed Resistance to Erosion | 137 |
6.6 | River Basins with Optimized External Shape | 137 |
6.7 | Constructal Fluid Trees are Robust | 142 |
6.8 | Rivers of People | 144 |
7 | Turbulent Structure | 149 |
7.1 | Two Flow Regimes: High Resistance and Low Resistance, Intertwined | 149 |
7.2 | Why Do Icebergs and Logs Drift Sideways? | 150 |
7.3 | The First and Smallest Eddy | 151 |
7.4 | The Stepwise Growth of Mixing Regions | 157 |
7.5 | The Onset of Rolls in Fluid Layers Heated from Below | 158 |
7.6 | Partitioned Fluid Layer Heated from the Side | 161 |
7.7 | Optimization of Flow Geometry in Layers Heated from Below | 163 |
7.8 | Porous Layer Saturated with Fluid and Heated from Below | 169 |
7.9 | Natural Structure in Multiphase Flow Systems | 174 |
7.10 | Dendritic Crystals | 175 |
8 | Convective Trees | 181 |
8.1 | Convection in the Interstices versus Convection in the Tree Branches | 181 |
8.2 | Two-Dimensional T-Shaped Plate Fins | 182 |
8.3 | Umbrellas of Cylindrical Fins | 187 |
8.4 | Fin Trees with Optimal Plate-to-Plate Spacings | 189 |
8.5 | Trees of Circular Fins | 198 |
8.6 | Conduction in Interstitial Spaces and Convection in Channels | 202 |
8.7 | Parallel-Plate Channels | 203 |
8.8 | Optimally Tapered Parallel-Plate Channels | 208 |
8.9 | Round Tubes | 212 |
8.10 | Two Fluid Trees in Counterflow are One Tree for Convection | 215 |
9 | Structure in Power Systems | 219 |
9.1 | Allocation of Heat Exchange Inventory | 220 |
9.2 | Distribution of Insulation | 223 |
9.3 | Structure in Low-Temperature Machines | 226 |
9.4 | Streams in Counterflow | 230 |
9.5 | Flying Machines and Animals | 234 |
9.6 | Flying Carpets and Processions | 240 |
10 | Structure in Time: Rhythm | 246 |
10.1 | Intermittent Heat Transfer | 247 |
10.2 | Defrosting Refrigerators | 249 |
10.3 | Cleaning Power Plants | 252 |
10.4 | Breathing | 254 |
10.5 | Heart Beating | 257 |
10.6 | The Effect of Animal Body Size | 260 |
11 | Transportation and Economics Structure | 270 |
11.1 | Minimum Travel Time | 271 |
11.2 | Minimum Cost | 278 |
11.3 | Maximum Revenue | 283 |
11.4 | Development of Economics Structure in Time | 287 |
11.5 | Optimally Shaped Triangular Areas | 288 |
11.6 | Older Methods in Spatial Economics | 293 |
11.7 | The Law of Refraction | 295 |
11.8 | The Law of Parsimony | 296 |
12 | Shapes with Constant Resistance | 300 |
12.1 | How, Not What | 300 |
12.2 | More Degrees of Freedom | 301 |
12.3 | More Efficient Structures Look More "Natural" | 308 |
12.4 | More Material Where the Need is Greater | 311 |
12.5 | An Old and Prevalent Natural Phenomenon | 312 |
About the Author | 315 | |
Author Index | 317 | |
Subject Index | 320 |
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