Adrian Bejan's Blog, page 10

Physics explains why time passes faster as you age

[image error] Ephrat Livni exposes Prof. Bejan’s Constructal view on the passage of time, on the basis of a peer-reviewed publication to be soon published in the European Review journal, in this recent online article.

Source

Ephrat Livni, Physics explains why time passes faster as you age , What you see is what you get, QUARTZ, 8 Jan. 2019, qz.com

 

 

Constructal Law & The Physics of Life –the Ecosomatics podcast

[image error] In this one-hour long interview on the Ecosomatics podcast, Professor Adrian Bejan discusses the Constructal Law & The Physics of Life.

https://soundcloud.com/theecosomaticspodcast/constructal-law-the-physics-of-life-with-professor-adrian-bejan

Dr. Adrian Bejan, Miembro Correspondiente de la Academia Mexicana de Ciencias – AMC

El Dr. Adrian Bejan, profesor distinguido de la Universidad de Duke, EUA, ingresó a nuestra Academia como Miembro Correspondiente. La ceremonia de ingreso y a la conferencia que el Dr. Bejan dictará con el tema:

“Evolution as Physics” – Link for the invitation

Invitan: la Academia Mexicana de Ciencias, la Academia de Ingeniería de México, la Sociedad Mexicana de Ingeniería Mecánica y la Universidad Autónoma de Campeche.

Fecha y hora: Jueves 20 de septiembre de 2018, 9:40 horas, en la Ciudad de Campeche, Camp.

Lugar: Auditorio “Guillermo González Galera” de la Universidad Autónoma de Campeche, ubicado en Av. Agustín Melgar s/n, Colonia Buenavista, Campeche, Camp, México.

Constructal Design of Aircraft

New fronts of research using Constructal Theory

“Body-freedom flutter characteristics of flying wing aircraft vary with engine placement. Here, we show why a certain design parameter (engine placement) influences the aeroelastic flight envelope of the aircraft. The approach is based on the constructal law and the principle that a design that avoids stress strangulations provides better access to the flows that inhabit the system. This is in sharp contrast with trial-and-error techniques such as optimization, which means to opt from among different choices, cases, and designs. Under the same flight condition, the flow of stresses through the aircraft wings is investigated for several configurations including those with maximum and minimum flutter speeds. The results reveal that when the stresses flow smoothly in the wings the stability of the aircraft improves. On the other hand, in the cases in which the engine location causes stress strangulation, the flutter speed decreases considerably. The most severe stress strangulation corresponds to the aircraft configuration with minimum flutter speed (i.e., engine placement at 20% span behind the reference line). The smoothest flow of stresses happens in the configuration with maximum flutter speed (i.e., engine placement at 80% span forward of the reference line).”

 

Link to the paper at AIAAJ

The Tortoise and the Hare

[image error] “The fastest animals and vehicles are neither the biggest nor the fastest over lifetime” is the subtitle of A. Bejan, U. Gunes, J. D. Charles, and B. Sahin in their Nature Scientific Report published the 27 August 2018.

Thanks to their theory, in this article, the authors explained phenomena such as the emergence of animal “outliers”:  higher speed at smaller body mass.

They show that what accounts for the animal outlier also accounts for the vehicle outlier: military jet fighter are smaller and reach speeds higher than the biggest commercial aircraft. Yet, like the cheetah, the jet fighter spends most of its active life at rest, on the ground, out of sight.  This new view gives the word ‘outlier’ a different meaning: the jet fighter is the outlier because, during its overall lifetime, it is slower than the bigger commercial aircraft, which spend most of its time flying.

This new meaning is in fact the oldest, taught by Aesop in his fable “The Tortoise and the Hare”: what matters in the life of the mover is the movement – i.e. the territory covered, the speed averaged – over the whole lifetime.

A. Bejan, U. Gunes, J. D. Charles & B. Sahin, The fastest animals and vehicles are neither the biggest nor the fastest over lifetime , Scientific Reports, volume 8, Article number: 12925 (2018), Nature, 27 August 2018.

Thermodynamics Today

In a recent paper published in the prestigious “Energy”, Bejan presents his view on Thermodynamics and Science itself.

“Science is like a civilized territory that improves, prospers and expands because it makes life better for the people who belong to it. It expands as long as it keeps producing useful things, which attract people. The civilized welcome the newcomers, the nobodies, provided that they obey the laws, the discipline. People join because their lives become better that way.”

“To fight the barbarians who pillage on the perimeter is a necessary and unpleasant effort, a nuisance, not the objective. As the defeated barbarians are assimilated and civilized, the civilized territory expands and, as a result, life, peace, movement and freedom flourish. The civilized territory that does not fight the pillagers is destined to disappear along with the good way of life that it was sustaining.”

“Thermodynamics, like all the useful artifacts (e.g., science) produced by the civilized, is no different.”

https://www.sciencedirect.com/science/article/pii/S0360544218313896?via%3Dihub (open access for one month)

https://drive.google.com/open?id=0B_eof9X53lcOM3lLVjFmR3JkWTI0VmhLSWJtb0gxbXpjR3pZ

生命的物理學 – 從生命到經濟消長

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Professor’s Adrian Bejan’s book on the Constructal Theory, The Physics of Life: The Evolution of Everything, will be available in Chinese the 27 of July, 2018:

生命的物理學：從生命到經濟消長

The book can be ordered on the following site: http://www.books.com.tw/products/0010792664

 

 

 

 

Chinese edition of The Physics of Life announced

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Professor’s Adrian Bejan’s book on the Constructal Theory, The Physics of Life: The Evolution of Everything, will be available in Chinese the 27 of July, 2018:

生命的物理學：從生命到經濟消長

The book can be ordered on the following site: http://www.books.com.tw/products/0010792664

 

 

 

CLC2019 – Constructal Law & Second Law Conference announced in Porto Alegre, 11-13 March 2019

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The 12th conference on the Constructal law will be hosted by Universidade do Vale do Rio do Sinos, São Leopoldo, RS, Brazil. This event will take place from the 11 to the 13 March 2019 in the Unisinos university.

Registration and more information on the conference’s web site:



http://www.unisinos.br/eventos/constructal-law-second-law-conference-exclcen

Human innovation and enlightenment explained by Physics

[image error] Ephrat Livni reviews, in this Quartz article, the application of Constructal theory to the physical description of innovation and human illumination. Livni article refers to a recent research paper on Social organization by A. Bejan  and other researchers: Social organization: The thermodynamic basis.

Simply put, the theory explains that “this theoretical framework also reveals the physical meaning of innovation: It is a local design change that liberates the flow over the entire territory inhabited by the organized movers”. In brief,  innovations open new pathways that generate opportunity for more movement for everyone around them.

And, as the local invention attract sudden movement, then the whole flowing area, or population, becomes wealthier than before. According to Bejan, “this is the tangible, or physical effect of a single idea, and why research, science, questioning, and tinkering benefit the whole of society”.

Read the full story by Ephrat Livni on Quartz: Physics can explain human innovation and enlightenment, June 30, 2018.