#constructal law

[albertchessa]

Untitled 46

[distorteddetritus]

Constructal Tree Tops

Available as an art print, canvas print, and a throw pillow

[albertchessa]

Untitled 43

[bsahely]

Constructal Law and Its Corollaries of Extremum Principles for Energy Expenditure and Entropy Production | A. Heitor Reis

Constructal Law and Its Corollaries of Extremum Principles for Energy Expenditure and Entropy Production | A. Heitor Reis

Use and validity of principles of extremum of entropy production in the study of complex systems

A. Heitor Reis∗

University of Évora, Department of Physics and Geophysics Center of Évora, Colégio Luis Verney, R. Romão Ramalho, 59, 7002-554, Évora, Portugal

∗Tel.: [phone]; fax: [phone].

E-mail addresses: [email protected], [email protected]. http://dx.doi.org/10.1016/j.aop.2014.03.013 0003…

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[bsahely]

Thermodynamics today | Prof. Adrian Bejan

Thermodynamics today | Prof. Adrian Bejan

Reproduced from: sci-hub.tw/10.1016/j.energy.2018.07.092

Thermodynamics today

Adrian Bejan

J. A. Jones Distinguished Professor

Duke University

[email protected]

Accepted Manuscript

PII: S0360-5442(18)31389-6

DOI: 10.1016/j.energy.2018.07.092

Reference: EGY 13357

To appear in: Energy

Received Date: 27 April 2018

Accepted Date: 14 July 2018

Please cite this article as: Adrian Bejan, Thermodynamics…

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[kleeirwin]

Occasionally on my physics website, I share what the QGR team is taking time to enjoy reading and this month is ‘Design In Nature: How the Constructal Law Governs Evolution in Biology, Physics, Technology, and Social Organizations’ by Adrian Nejan & J. Peder Zane .

And, truly, "paradigm-shifting book" is an understatement. ​ "Everything—from biological life to inanimate systems—generates shape and structure and evolves in a sequence of ever-improving designs in order to facilitate flow. River basins, cardiovascular systems, and bolts of lightning are very efficient flow systems to move a current—of water, blood, or electricity. Likewise, the more complex architecture of animals evolve to cover greater distance per unit of useful energy, or increase their flow across the land. Such designs also appear in human organizations, like the hierarchical “flowcharts” or reporting structures in corporations and political bodies. All are governed by the same principle, known as the constructal law, and configure and reconfigure themselves over time to flow more efficiently. Written in an easy style that achieves clarity without sacrificing complexity, Design in Nature is a paradigm-shifting book that will fundamentally transform our understanding of the world around us."

[bsahely]

Helping to evolve our planetary abode to greater and better futures

Helping to evolve our planetary abode to greater and better futures

It we stop and look around us today, we will see that the world has gone mad!! Murders are increasing in our beautiful federation, terrorist attacks are occuring all over the world, wars and instability are escalating in neighbouring lands, and one nation has pulled out of dealing resolutely with the common threat of climate destabilisation. Although Prof John McMurtry’s has already laid out in…

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[polyugec-blog]

The constructal law is the statement that for a flow system to persist in time it must evolve in such a way that it provides easier access to its currents. This is the law of configuration generation, or the law of design. The theoretical developments reviewed in this article show that this law accounts for (i) architectures that maximize flow access (e.g. trees), (ii) features that impede flow (e.g. impermeable walls, insulation) and (iii) static organs that support flow structures. The proportionality between body heat loss and body size raised to the power 3/4 is deduced from the discovery that the counterflow of two trees is the optimal configuration for achieving (i) and (ii) simultaneously: maximum fluid-flow access and minimum heat leak. Other allometric examples deduced from the constructal law are the flying speeds of insects, birds and aeroplanes, the porosity and hair strand diameter of the fur coats of animals, and the existence of optimal organ sizes. Body size and configuration are intrinsic parts of the deduced configuration. They are results, not assumptions. The constructal law extends physics (thermodynamics) to cover the configuration, performance, global size and global internal flow volume of flow systems. The time evolution of such configurations can be described as survival by increasing performance, compactness and territory.