Constructal Law of Design in Nature
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Scooped by Marcelo Errera
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Qualified Citations of 'constructal' publications, rising on their constructal S-curve

Qualified Citations of 'constructal' publications,     rising on their constructal S-curve | Constructal Law of Design in Nature | Scoop.it

The updated indices of constructal related works in

qualified peer-review publications. The chart shows the number of citations per year.

 

h-index: 65

(excerpt from Clarivate Analytics web of science with "constructal" as topic)

Marcelo Errera's insight:

The accumulated qualified citations since 1996 surpassed the 23,000 barrier. 


An essay over Constructal Theory and Philosophy of Science: 
http://www.acad.ro/sectii2002/proceedings/doc2018-1s/continut/111-116.pdf    

The next CLC conference will be held in Villanova University in May 20-21/2022: (postponed due the sanitary crisis)

(I was absent because the platform had limited the number of scoops I can post for free. We have resumed activities in scoopit early January/21).

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Why does time move more quickly as we age? | Adrian Bejan | TEDxMidAtlantic

If you've ever noticed that time seems to move more quickly the older you are, you've caught a glimpse of one of the effects of what Adrian Bejan calls the "Constructal Law." Bejan is noted for having described the law, one which he believes to be a "first principle" of physics and describes how systems of energy persist throughout time. Bejan has identified data which suggests that time perception depends on the way our eyes and brain send and perceive images — at first very quickly, and then more slowly as we age, giving the impression that time itself moves more rapidly when we get older. Adrian Bejan received the Benjamin Franklin Medal for “Thermodynamics and constructal theory, which predicts natural design and its evolution in engineering, scientific, and social systems.” All his degrees are from MIT. At Duke University he is the J.A. Jones Distinguished Professor. He authored 30 books and 650 peer-refereed journal articles, and was awarded 18 honorary doctorates from universities in 11 countries. His latest book is The Physics of Life (St. Martin’s Press 2016), and his most recent work focuses on how the human mind perceives time. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at https://www.ted.com/tedx
Marcelo Errera's insight:
Another great opportunity to grasp the main points of constructal law reach over domains -- from so close to us to the largest planetary scale.
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Researchers Imitate Natural Vascular Structures to 3D Print New Systems for Self-Healing in Cement

Researchers Imitate Natural Vascular Structures to 3D Print New Systems for Self-Healing in Cement | Constructal Law of Design in Nature | Scoop.it
UK researchers from the Department of Engineering, University of Cambridge are studying new systems for construction materials, outlining their results in the recently published ‘A novel biomimetic design of a...
Marcelo Errera's insight:
"The emergence of such vasculatures for turbulent flow is compared with the corresponding phenomenon when the flow is laminar. To predict this design generation phenomenon is essential to being able to scale up the designs of complex flow structures, from small scale models to life size models. The constructal law is a bridge between the principles of physics and biology."[1]

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The Physics Behind Freedom

The Physics Behind Freedom | Constructal Law of Design in Nature | Scoop.it

The Physics Behind Freedom


"Bejan’s book shows that freedom is actually scientifically good for society. It truly is a groundbreaking fusion of physics and economics. Bejan isn’t a political philosopher or an economist; he’s just a scientist charting out the laws of physics and nature. However, his thoughts are actually pretty similar to the Austrian School of Economics which employs praxeology, or a theory of human action. In his case, he sees things through the lens of energy movement and evolution, the literal workings of the universe. Economists call prosperity the result of free people and free markets. He calls it a force of nature."


Marcelo Errera's insight:
Economics is the set of human actions related to our survival and betterment of our lives that we came to call it that way. If we haven't assigned such set to be a discipline of Science, it would take place any way as it does in ecosystems. 

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Survival of the Systems

Survival of the Systems | Constructal Law of Design in Nature | Scoop.it

Timothy M.Lenton, Timothy A.Kohler, Pablo A.Marquet, Richard A.Boyle, Michel Crucifix, David M.Wilkinson, Marten Scheffer

Trends Ecol. Evol.

Recent theoretical progress highlights that natural selection can occur based solely on differential persistence of biological entities, without the need for conventional replication.

This calls for a reconsideration of how ecosystems and social (-ecological) systems can evolve, based on identifying system-level properties that affect their persistence.

Feedback cycles have irreducible properties arising from the interactions of unrelated components, and are critical to determining ecosystem and social system persistence.

Self-perpetuating feedbacks involving the acquisition and recycling of resources, alteration of local environmental conditions, and amplification of disturbance factors, enhance ecosystem and social system spread and persistence.

Cycles built from the by-products of traits, naturally selected at lower levels, avoid conflict between levels and types of selection.

Read the full article at: www.sciencedirect.com


Via Complexity Digest
Marcelo Errera's insight:
No doubt an interesting topic. It seems a good reframing of the Constructal Law. One needs just to read "Diversity" as freedom do morph and it's the constructal law.

"What is life? is, of course, the big question. In 1944, Erwin Schrödinger, the Nobel Prize–winning Austrian physicist, made a valiant and now classic attempt to answer this in his aptly titled book What Is Life?, which took up the question from a genetics and biology of living cells starting point" (...) "According to constructal law, life is movement that evolves freely, in both animate and inanimate spheres. Alive are all the freely changing flow configurations and rhythms that facilitate flow and offer greater access to movement. When movement stops, life ends. When movement does not have the freedom to change and find greater access, life ends."[1]

[1]Chapter 1, The Physics of Life The Evolution of Everything,  Adrian Bejan St. Martin's Press https://www.barnesandnoble.com/w/the-physics-of-life-adrian-bejan/1122597940#)
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Fractal flaming hydrogen wiggles through tiny gaps

Fractal flaming hydrogen wiggles through tiny gaps | Constructal Law of Design in Nature | Scoop.it
In a confined space, hydrogen burns on, making a beautiful fractal pattern.
Marcelo Errera's insight:
Fantastic work !
The configurations that emerged resembles "fractals" but in fact are constructal configurations. Those "patterns" are predictable at certain extent for there's a physics principle that drives it. Random behaviour may take place more from incidental variations of properties e boundary conditions.
Our 1998 paper on the spontaneous emergence of such networks addresed river drainage basins.

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Why free will is beyond physics

Why free will is beyond physics | Constructal Law of Design in Nature | Scoop.it

Philip Ball argues that “free will” is not ruled out by physics – because it doesn’t stem from physics in the first place

Read the full article at: physicsworld.com


Via Complexity Digest
Marcelo Errera's insight:
A closer look at this argument is in order. One should start by establishing common grounds and definitions of the terms and quantities.
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Ancient Migration Patterns Offer Explanation for Unequal Susceptibility to COVID-19

Ancient Migration Patterns Offer Explanation for Unequal Susceptibility to COVID-19 | Constructal Law of Design in Nature | Scoop.it
Commentary A group of genes passed down from human cousins who went extinct 50,000 years ago explains wh
Marcelo Errera's insight:
First step in Science is to pose questions for observation we do not have explanations. Then we seek answers. Humans move farther and farther as their ability to move improved 
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Seven implications of complexity for organisations

Seven implications of complexity for organisations | Constructal Law of Design in Nature | Scoop.it

My last post was about Paul Cilliers’s 7 characteristics of complex systems.  In this post I want to explore 7 of the implications of complexity that he thought was important for those working in and on organisations (...)


Via june holley, Complexity Digest
Marcelo Errera's insight:
What we see is in the eyes of the beholder or are proper physical quantities?
There are instances in which certain discernible features repeat in Nature. The so called "theory of complex systems" provide a thorough understanding of quantitative characteristics that emerge after organization, but it misses a "natural principle" that explains the "whys". Mostly it establishes variations or corollaries of the Constructal law as axioms. In essence it is sophisticated modelling. 
The wisdom to identify the underlying physics principles is almost a form of art in science.
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2018 NSF Workshop: April 17 -18, 2018 Constructal Theory: 20 Years of Exploration and What the Future Holds

2018 NSF Workshop: April 17 -18, 2018 Constructal Theory: 20 Years of Exploration and What the Future Holds | Constructal Law of Design in Nature | Scoop.it
April 17 -18, 2018 

Constructal Theory: 20 Years of Exploration and What the Future Holds In constructal theory—a mental view of the geometric principle for flow structures—it is thought that “for a finite-size flow system to persist in time (to live), it must evolve in such a way that it provides easier access to the currents that flow through it.” The current can be fluid, mass, energy, heat, money, information, publications, mechanical stress, electrical current, and so forth. Constructal theory has grown into its own field of research with over 5000 textbook, journal, and conference publications in a broad range of areas including engineering and the physical and social sciences. This workshop aims to advance and accelerate constructal theory through the synergistic interaction among theoretical explorations and industrial applications for new frontiers.

APRIL 18, 2018 1:00 PM - 4:00 PM The Inn at Villanova University 601 County Line Road Wayne, PA 19087 (Where Matsonford & County Line Roads meet)

Marcelo Errera's insight:
Almost a month to the 2018 NSF Workshop:Constructal Theory: 20 Years of Exploration and What the Future Holds.



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Pattern formation—the paradoxical role of turbulence

Pattern formation—the paradoxical role of turbulence | Constructal Law of Design in Nature | Scoop.it

The formation of self-organizing molecular patterns in cells is a critical component of many biological processes. Researchers from Ludwig-Maximilians-Universitaet (LMU) in Munich have proposed a new theory to explain how such patterns emerge in complex natural systems.

Marcelo Errera's insight:
There is a difference between patterns and organization or configuration of flow-systems. Patterns may be formed in a ephemeral highly stochastic and non-linear phenomenon. The system reaches equilibrium, no flow takes place anymore, and the final result which is imprinted remains unchanged.

In live flow-systems the configuration - which could be mistaken by a pattern - continuously evolves in order to achieve greater access to the currents that flow through the system. 
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Behavior of Thermally Radiating Tree-like Fins | Journal of Heat Transfer | ASME DC

Behavior of Thermally Radiating Tree-like Fins | Journal of Heat Transfer | ASME DC | Constructal Law of Design in Nature | Scoop.it
The performance of tree-like fins with varying bifurcation angle, surface emissivity, material, width-to-thickness ratio, and base heat rate was examined. Overall system performance was examined computationally. The computational results have been validated, verified, and cast in terms of commonly defined dimensionless parameters. Tree-like fins were found to be more effective and more efficient than the rectangular fins. Fin efficiency and effectiveness were found to increase with increasing bifurcation angles while base temperatures were found to decrease with increasing bifurcation angles. As expected, base temperatures were highest for the largest width-to-thickness ratios and smallest for materials with relatively higher thermal conductivities.
Marcelo Errera's insight:
An interesting application of Constructal Design with radiation heat transfer.
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Macroscopic irreversibility and microscopic paradox: A Constructal law analysis of atoms as open systems

Macroscopic irreversibility and microscopic paradox: A Constructal law analysis of atoms as open systems | Constructal Law of Design in Nature | Scoop.it

The relation between macroscopic irreversibility and microscopic reversibility is a present unsolved problem. Constructal law is introduced to develop analytically the Einstein’s, Schrödinger’s, and Gibbs’ considerations on the interaction between particles and thermal radiation (photons). The result leads to consider the atoms and molecules as open systems in continuous interaction with flows of photons from their surroundings. The consequent result is that, in any atomic transition, the energy related to the microscopic irreversibility is negligible, while when a great number of atoms (of the order of Avogadro’s number) is considered, this energy related to irreversibility becomes so large that its order of magnitude must be taken into account. Consequently, macroscopic irreversibility results related to microscopic irreversibility by flows of photons and amount of atoms involved in the processes.

Marcelo Errera's insight:
This is the first incursion with Constructal Law in the microscopic scale. Prof. Lucia presents an outstanding essay that shows how an atom internal geometry influences the physics at the particles level and leaves the marks for the macroscopic world.
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Life as a self-referential deep learning system: A quantum-like Boltzmann machine model

Life as a self-referential deep learning system: A quantum-like Boltzmann machine model | Constructal Law of Design in Nature | Scoop.it

It has been empirically found that the income structure of market-economy societies obeys a Boltzmann-like income distribution. The empirical evidence…


Highlights 

• Boltzmann-like income distribution emerges spontaneously in a market economy. 

• Technological progress is equivalent to the information entropy of an economic society. 

• The entropy in a human society is self-referential. 

• Self-reference changes a classical physical system into a quantum-like system.


Marcelo Errera's insight:
New studies show that emergency of structures and hierarchy in market-economy (pure or strongly driven) is a natural expected phenomenon as well as the creation of wealth associated to movement over the planet.

Further on that:
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Viral Flows – John Hagel

Viral Flows – John Hagel | Constructal Law of Design in Nature | Scoop.it

Viral Flows Category:Crisis,Emotions,Flow,Institutional Innovation,Learning,Narratives,Strategy For over a decade, I’ve been writing about the Big Shift. There are many dimensions to this shift, but our current crisis highlights the role of flows. In this post, I want to explore the paradox of flows – flows can be both a source of exponential growth and a source of severe regression. We need to understand both dimensions of flows if we want to flourish. What are flows? Flows take many different forms. My focus has been on the flows of knowledge that feed learning by helping to create new knowledge at an accelerating pace. At their foundation, these flows involve connections across people, including serendipitous connections that weren’t anticipated. Urbanization around the world has been accelerating for decades precisely because we have an intuitive sense that we will learn faster in densely populated areas than we ever could, even with all our digital infrastructures and connectivity, in small towns or rural areas. The flows of people, and the knowledge we all possess, including tacit knowledge, are augmented by other kinds of flows – data, goods and money. These flows have expanded globally for decades and are supporting the flows of knowledge that help us to accelerate learning. They have been a key driver of increasing global prosperity and the rapid reduction in poverty in more and more countries. There’s a growing realization that, the more of us who participate in these flows, the faster we will all learn. The more inclusive the flows become, the more we will all prosper, as the learning goes exponential. Systems that thrive are ones that increase the flows over time – here I have been very much influenced by the work of Adrian Bejan and his Constructal Law:  there is a universal tendency toward design in nature, in the physics of everything, to evolve configurations so that they flow more easily, to create greater access to the currents they move. The dark side of flows But not all flows accelerate learning. Some flows become significant barriers to learning. What do I mean? Let me start with something that has increasingly occupied my attention. Emotions tend to spread virally. If many people are feeling a certain way, other people around them become susceptible to the same feelings. As I’ve written elsewhere, I am struck by the spread of fear as the dominant emotion globally – and that was before the current crisis! Fear can be contagious – if everyone around me is afraid, I am more likely to become afraid as well. Emotions tend to cascade on their own, but they spread even more rapidly when amplified by news media that tend to focus on the latest disaster or crisis. When was the last time you heard a good news story (and I’m talking about even before the current crisis)? And, let’s not even mention the spread of fake news designed to amplify fear. Emotions differ in terms of their impact on learning, but fear is one that has great potential to inhibit learning. If I’m afraid, I shorten my time horizons, I become much more risk averse and I become much less trusting of others. I’m much more likely to block the flows that will help me to learn faster because they increase uncertainty. Instead of flows, I seek stability. 

Marcelo Errera's insight:
Hagel raises the fundamental issue "We need to understand both dimensions of flows if we want to flourish. What are flows?" since flows are everywhere that is alive.

Worth stressing is "People with passion flourish in flows while those without passion can be overwhelmed. Flows and filters Flows can become overwhelming if we don’t have a way to focus" 

Also relevant:  "Emotions differ in terms of their impact on learning, but fear is one that has great potential to inhibit learning. If I’m afraid, I shorten my time horizons, I become much more risk averse and I become much less trusting of others. I’m much more likely to block the flows that will help me to learn faster because they increase uncertainty. Instead of flows, I seek stability."
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The golden ratio is everywhere in Nature, Science, Music, Art and Architecture

The golden ratio is everywhere in Nature, Science, Music, Art and Architecture | Constructal Law of Design in Nature | Scoop.it
The golden ratio is everywhere in Nature, Science, Music, Art and Architecture and even in The Da Vinci Code. But what's behind that divine proportion?
Marcelo Errera's insight:
It's good to have more and more confirmations that the so-called golden ratio is ubiquitous. That in turn raises the issue of why, not how, but why it happens.  One reasonable argument of Physics that underlies such strong trend is presented in:

A. Bejan, THE GOLDEN RATIO PREDICTED: VISION, COGNITION AND LOCOMOTION AS A SINGLE DESIGN IN NATURE. International Journal of Design & Nature and Ecodynamics.  Volume 4 (2009), Issue 2 Pages 97 - 104. DOI 10.2495/DNE-V4-N2-97-104


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The Physics Behind Tumor Growth

The Physics Behind Tumor Growth | Constructal Law of Design in Nature | Scoop.it

"New theory uses physics to predict the growth stages of cancerous tumors


In the paper, Bejan, Samei and doctoral student Thomas Sauer demonstrate how a tumor’s growth and internal reorganization as it grows are directly tied to its need to create greater access to flowing nutrients as well as conduits for removing refuse. They use these insights to predict the growth of cell clusters as a function of structure, and also to predict the critical cluster sizes that mark the transitions from one distinct configuration to the next."

Marcelo Errera's insight:
Cancer tumors not only cannot escape the Constructal Law but they benefit from it
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Morphing the design to go with the times

Morphing the design to go with the times | Constructal Law of Design in Nature | Scoop.it

"The recorded history of technology and science and art shows that the evolutionary path of design is toward a greater number of dimensions, more degrees of freedom, and greater performance, efficiency and economy. Until now, designs have evolved in steps from one to two and three dimensions. The future will bring one more step, to four dimensions: three-dimensional objects that morph in time in accord with their time-changing environmental conditions. This concept is illustrated with the thermo-fluid design and time-behavior of a volume filled with parallel plates cooled by forced convection. When the pressure difference that drives the flow varies stepwise in time, the plate to plate spacing for maximum heat transfer density must change. If the structure is free to morph to maintain its optimal spacings in step with its changing environment, then the time-integrated performance of the morphing object is maximum. If the structure is rigid (sized optimally for one flow condition), its performance is inferior. The general significance and applicability of this future of design activity is discussed."

Marcelo Errera's insight:
One can hardly see the pathways of design evolution in Nature, for not only there are internal process driving change in response to the surroundings, but the surroundings itself does change in time. There area cases in which the design evolution of the given entity is path dependent some times not, and that affects one's ability to observe the design evolution process.
Nevertheless, there are unequivocal trends.

International Communications in Heat and Mass Transfer 120 (2021) 104837

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Research shows fractals could be pleasing in solar panels

Research shows fractals could be pleasing in solar panels | Constructal Law of Design in Nature | Scoop.it
Stress reduction and improved solar electricity could someday come together in an unexpected package, and a University of Oregon study suggests that a new design of eye-pleasing, fractal-patterned rooftop solar panels could deliver the goods.
Marcelo Errera's insight:
They're not fractals because they to not branch ad infinitum, by definition. But those tree networks are constructal because they present a finite-size small scale that makes the transition to "volumetric" or diffusive flow of charges to "organised" flow. More on this from 2007: 
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One of These Pictures Is the Brain, the Other is the Universe. Can You Tell Which is Which?

One of These Pictures Is the Brain, the Other is the Universe. Can You Tell Which is Which? | Constructal Law of Design in Nature | Scoop.it
“Science is not only compatible with spirituality; it is a profound source of spirituality. When we recognize our place in an immensity of light years and in the passage of ages, when we grasp the intricacy, beauty and subtlety of life, then that soaring feeling, that sense of elation and humility...
Marcelo Errera's insight:
That there's an underlying principle that generates configurations such those in all scales imaginable should be one of top priority in our quest for knowledge
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Why branding is rooted in evolution. We brand to survive.

Why branding is rooted in evolution. We brand to survive. | Constructal Law of Design in Nature | Scoop.it
Evelyn Starr looks at how your company hasn't really had control over your brand - consumers do, and they brand to survive.
Marcelo Errera's insight:
The principles o biology evolution can be extended to many fields because it is a special and limited case of the constructal law
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Why does evolution sometimes repeat itself? Spider-eating spiders may hold the answer

Why does evolution sometimes repeat itself? Spider-eating spiders may hold the answer | Constructal Law of Design in Nature | Scoop.it

"Discovering something for the second time might sound like a letdown. Not for ecologists in Hawaii, who have found that spider-eating spiders on four islands there independently evolved the same colors: gold, black, and white. This rare example of parallel evolution, which has also been seen in one other Hawaiian spider, could help clarify one of biology’s biggest mysteries: how and when evolution repeats itself. “It’s one of the coolest hidden [examples] of animals evolving new species,” says Robert Fleischer, a conservation genomicist at the Smithsonian Conservation Biology Institute in Washington, D.C., who was not involved with the work."

Marcelo Errera's insight:
One more great paper on that old question. Extraordinary work.

"Why does evolution sometimes repeat itself" definitely is a question that deserves an answer. 

Can chance alone do that ?
Can necessity alone do that ?
Can just both chance and necessity do that ?

What if we look at those traits as atributes of configurations of living systems that to stay alive as such, not as individual exemplar, develop freedom of change, of morphing ? And that they do change as response to environmental conditions and currents (matter, energy, information, etc.) that are imposed to the systems formed by those very traits ? And also that for some reason some configurations become more frequent over time because of some performance criterion ? 

Certainly this is not just chance.
Certainly this is not just necessity.
And certainly not just the combination of both.

There must be, it is fair to assume there is, a deterministic principle working on everything and providing some major trends while accommodating diversity that meets the intrinsic uncontrolled conditions of the environment and the limited means of morphing of each entity.

Those are the reasons Wallace-Darwin postulation of evolution by natural selection is so powerful, even though they had to wisely "abuse" of the inductivism to generalize their findings. It was, still is, inviable to test their theory (recognised as "law") up to indisputable proof.

Came the time we moved on and we look at all instances "traits" and configurations change over time. It happens everywhere and far beyond the so-called "living systems" realm.

The old paradigm was exhausted and it failed to cover these amazing phenomena. The "sometimes" in the original question acknowledges the need for a new paradigm.

"There is a new Law in physics, and that changes everything."

Look it up.


(edited for typos and grammar)
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Information theory and complex life

Information theory and complex life | Constructal Law of Design in Nature | Scoop.it
Despite the obvious advantage of simple life forms capable of fast replication, different levels of cognitive complexity have been achieved by living systems in terms of their potential to cope with environmental uncertainty. Against the inevitable cost associated with detecting environmental cues and responding to them in adaptive ways, we conjecture that the potential for predicting the environment can overcome the expenses associated with maintaining costly, complex structures. We present a minimal formal model grounded in information theory and selection, in which successive generations of agents are mapped into transmitters and receivers of a coded message. Our agents are guessing machines and their capacity to deal with environments of different complexity defines the conditions to sustain more complex agents.

Via june holley
Marcelo Errera's insight:
Excellent take on the evolution of organisation (organization) of flow-systems that are under a imposed current of information.

Why does it happen? 

Do living systems exist just to exchange information with the environment ?

#PhysicsOfLife and the #constructal law offer insight in this model. It's #physics.
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How One Quantum Particle Can Send Messages to Itself

How One Quantum Particle Can Send Messages to Itself | Constructal Law of Design in Nature | Scoop.it

Just another demonstration of the magic of quantum physics. 


Quantum computing promises a future where technology is exponentially faster, more efficient, and more secure. But the mechanics of how it will work are still being figured out. Now, scientists from the University of Vienna and the Australian Institute for Quantum Optics and Quantum Information have demonstrated one possibility for quantum communication that was previously unknown: using one photon can act as both a sender and receiver of information. A paper published this month by Flavio Del Santo, Borivoje Dakić, and Philip Walther in Physical Review Letters, and a follow up demonstration posted on arXiv.org explains how. The technique relies on quantum superposition—the idea that unobserved quantum particles can be in more than one place at once. The researchers demonstrate that if two people, Alice and Bob (the usual names for imaginary subjects of quantum computation experiments), are at a distance from each other, they can use just one photon to communicate. This is how it works: Alice and Bob are in control of a photon which is in a superposition. Either Alice or Bob can manipulate the photon to send a 0 or a 1 to the other. If they both put either a 0 or a 1, Alice gets the photon. If they put in different bits, then Bob gets it. Since Alice knows whether she put in a 0 or 1, she can deduce that Bob input the opposite bit.

Marcelo Errera's insight:
What I believe is close connected to the Constructal Law of Design in Nature is:

"There's no reason why this technique wasn't discovered earlier—scientists just hadn't thought of it yet. "Sometimes you overlook a cool idea, and then it's just literally right in front of your nose,” Walther told Science News. " 

which reminds us that new discoveries and new theories can appear in anytime. Sometimes they just need the right question or mindset.
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Design and Performance Evaluation of Constructal Microchannel Network Heatsinks | Journal of Heat Transfer | ASME DC

Design and Performance Evaluation of Constructal Microchannel Network Heatsinks | Journal of Heat Transfer | ASME DC | Constructal Law of Design in Nature | Scoop.it
This work presents the development and analysis of constructal microchannel network architectures for heat dissipation. The network configurations are characterized by multiple flow ramifications and changes in length and hydraulic diameter scales through each ramification level. Architectures investigated experimentally in the past years have adopted constant scaling rules throughout their ramification levels. In this study, constructal theory inspires the design of network architectures with variable scaling rules and up to three ramification levels (N). As a result, it was verified that constructal networks allowed thermal resistance reduction of 15% (N = 2) and 42% (N = 3) for a micro heat sink at a characteristic operational regime. Architecture's selection criterion using performance curves is proposed and it was also demonstrated that the bifurcated network with diameter ratio according to Hess–Murray law is not appropriate for heat dissipation purposes in miniaturised devices.
Marcelo Errera's insight:
A contribution from collaborators of mine and myself. We have revisited tree network for cooling heatsinks.
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2018 NSF Workshop, April 17 -18, 2018: Constructal Theory: 20 Years of Exploration and What the Future Holds

In constructal theory—a mental view of the geometric principle for flow structures—it is thought that “for a finite-size flow system to persist in time (to live), it must evolve in such a way that it provides easier access to the currents that flow through it.” The current can be fluid, mass, energy, heat, money, information, publications, mechanical stress, electrical current, and so forth. Constructal theory has grown into its own field of research with over 5000 textbook, journal, and conference publications in a broad range of areas including engineering and the physical and social sciences. This workshop aims to advance and accelerate constructal theory through the synergistic interaction among theoretical explorations and industrial applications for new frontiers.

Villanova University is a Catholic university founded in 1842 by the Order of Saint Augustine. At Villanova, our educational experience is rooted in a passionate, collaborative pursuit of knowledge and service to others.

Marcelo Errera's insight:
This just in.  A workshop to honor Prof. Bejan and his recently awarded Franklin Institute medal.

19 April dinner & ceremony at Franklin Institute : https://www.fi.edu/awardsdinner
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