Aug 17, 2025
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Untitled 46
Anya is live and ready to show you everything. Watch her strip, dance, and perform exclusive shows just for you. Interact in real-time and make your fantasies come true.
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Constructal Tree Tops
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Untitled 43
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 Reisâ
University of Ăvora, Department of Physics and Geophysics Center of Ăvora, ColĂŠgio Luis Verney, R. RomĂŁo Ramalho, 59, 7002-554, Ăvora, Portugal
âTel.: +351 967324948; fax: +351 266 745394.
E-mail addresses: [email protected], [email protected]. http://dx.doi.org/10.1016/j.aop.2014.03.013 0003âŚ
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Thermodynamics today | Prof. Adrian Bejan
Thermodynamics today | Prof. Adrian Bejan
Reproduced from:Â sci-hub.tw/10.1016/j.energy.2018.07.092
Thermodynamics today
Adrian Bejan
J. A. Jones Distinguished Professor
Duke University
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, ThermodynamicsâŚ
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Occasionally on my physics website, I share what the QGR team is taking time to enjoy reading and this month is âDesign In Nature: How the Constructal Law Governs Evolution in Biology, Physics, Technology, and Social Organizationsâ by Adrian Nejan & J. Peder Zane .
And, truly, "paradigm-shifting book" is an understatement. â "Everythingâfrom biological life to inanimate systemsâgenerates 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 currentâof 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 âflowchartsâ 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."
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 McMurtryâs has already laid out inâŚ
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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.