Constructal law of design and evolution: Physics, biology, technology, and society

Bejan, Adrian; Lorente, Sylvie

doi:10.1063/1.4798429

Cited by 306 publications

(196 citation statements)

References 197 publications

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“…In particular, Bejan [37,38] has argued that constructal law governs the natural evolution and motion efficiency. Dumas [39,40] and Trancossi [41,42] have defined a technical design methodology for transport vehicle obtaining in the case of airships an effective optimization up to energy complete self-sufficiency by photovoltaic energy.…”

Section: Optimization Of Ground Vehiclesmentioning

confidence: 99%

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What price of speed? A critical revision through constructal optimization of transport modes

Trancossi

2015

Int J Energy Environ Eng

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The use of energy by the major modes and the environmental impact of freight transportation is a problem of increasing importance for future transportation policies. This paper aims to study the relative energy efficiency of the major transport modes, setting up an impartial analysis, improving previous literature substantially. Gabrielli and von Karman have studied the relationship between speed and energy consumption of the most common transport modes. From this pioneering activity different methods for evaluating the energetic performance of vehicles have developed. Initially the maximum vehicle power and theoretical performance limits have been calculated in terms of weight and payload. Energy efficiency has then been evaluated in terms of the first principle of thermodynamics as the mass of the vehicle times distance moved divided by thermal energy used. A more effective analysis can be performed both in terms of vehicle life cycle and in terms of second principle considering the quality and the amount of dissipated amount of useful energy. This paper defines an LCA based model, which could allow an effective comparison between different transport modes classifying them in terms of exergy destruction. In this case, an effective comparison, which considers the quality of used energy, can be performed allowing precise politics for a future more effective evaluation of the transport modes.

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Section: Optimization Of Ground Vehiclesmentioning

confidence: 99%

“…Bejan [34][35][36][37][38] has defined constructal theory, which is an effective method to understand the elementary logic of natural evolution and to allow design of more efficient …”

Section: Optimization Of Ground Vehiclesmentioning

confidence: 99%

What price of speed? A critical revision through constructal optimization of transport modes

Trancossi

2015

Int J Energy Environ Eng

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“…In [16], it is confirmed that the type of motion occurring while a fluid flows in a duct chooses is the one that assures maximum entropy generation (or minimum, depending on the constraints). Entropy is used for describing different phenomena involving both biological and inanimate systems, such as animal locomotion, vegetation, organ size, water basins and social organization [18,19]. As regards the discrepancy between the concepts of maximum and minimum entropy generation, in [20,21] it has been established that maximum entropy production principle can be considered as a direct consequence of minimum entropy generation.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation Analysis of Wildfire Propagation

Guelpa

Verda

2017

Entropy

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Entropy generation is commonly applied to describe the evolution of irreversible processes, such as heat transfer and turbulence. These are both dominating phenomena in fire propagation. In this paper, entropy generation analysis is applied to a grassland fire event, with the aim of finding possible links between entropy generation and propagation directions. The ultimate goal of such analysis consists in helping one to overcome possible limitations of the models usually applied to the prediction of wildfire propagation. These models are based on the application of the superimposition of the effects due to wind and slope, which has proven to fail in various cases. The analysis presented here shows that entropy generation allows a detailed analysis of the landscape propagation of a fire and can be thus applied to its quantitative description.

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“…2,3 The evolutionary designs that emerge naturally are tree-shaped when the tendency of the flow is to flow more easily between areas (or volumes) and discrete points. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] An important contemporary application of the tree-shaped design is in the energy storage systems.…”

Section: Introductionmentioning

confidence: 99%

Morphing tree structures for latent thermal energy storage

Ziaei

Lorente

Bejan

2015

Journal of Applied Physics

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Here, we report the numerical study of time dependent storage of energy by melting a phase change material. The heating is provided along invading lines, which change from single-line invasion to tree-shaped invasion. The numerical simulations show that the history of the amount of melted material is S-shaped. We also found that the fastest melting (i.e., the steepest S curve) is discovered by allowing the tree architecture to morph freely, toward greater access over time. The stem length and branching angle of invading trees can be selected such that the complete melting process is shorter. The melting process can also be made faster by increasing the complexity of the tree structure. V C 2015 AIP Publishing LLC. [http://dx

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Constructal law of design and evolution: Physics, biology, technology, and society

Cited by 306 publications

References 197 publications

What price of speed? A critical revision through constructal optimization of transport modes

What price of speed? A critical revision through constructal optimization of transport modes

Entropy Generation Analysis of Wildfire Propagation

Morphing tree structures for latent thermal energy storage

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