constructal law criticism

1Department of Mechanical Engineering and Materials Science, Duke University, Box 90300, Durham, NC 27708-0300, USA, 2Laboratory of Materials and Durability of Constructions, University of Toulouse, INSA, 135 avenue de Rangueil, 31077 Toulouse, France. The balanced and intertwined flows that generate our engineering, economics and social organization are no different from the natural flow architectures of biology (animal design) and geophysics (river basins, global circulation). The tree-shaped flows of nature are an icon of this duality: organized flow (streams along channels) coexists with disorganized flow (diffusion) across the spaces between channels. Why are lungs and river basins vascular? We collect anonymized statistics only for historical research. Its best to provide constructive criticism in private where you can have a conversation without feelings of humiliation. Let's create a thorough checklist of all your deliverables for your next assignment. It is actually a recurring experience in my studies, in which I have yet to find an authoritative text in either subject that recognizes the constructal law or theory. The constructal law is not about optimality (max, min, opt)it is the definition of life in physics terms, and of the time direction of the changes in flow configuration. with less and less expenditure of useful energy, then the shape of the pyramid (the angle at the base) is unique, size independent and dictated by the technology of the era. This can ease defensiveness from the employee and make the feedback session more fruitful. We showed analytically that when the flow is turbulent in the fully rough regime, the flow architecture should be based on multi-scale constructs in which each mother channel is supplied by four daughter channels. (a) Artificial Because in the second movie the erosion property of the seepage medium (the velocity threshold needed to remove one grain) is uniform, the dendritic flow structure that emerges is symmetric. The constructal law extends physics (thermodynamics) to cover the configuration, performance, global size and global internal flow volume of flow systems. The Constructal law is the law of physics that accounts for the natural tendency of all flow systems (animate and inanimate) to change into configurations that offer progressively greater flow access over time. But I also note that constructal theory remains outside the mainstream discourse in contemporary theoretical physics, astrophysics, and cosmology. In other words, a system will die if it. This thought comes in conflict with the constructal theory of locomotion (rule (viii)), according to which the vehicle or animal must destroy an amount of exergy (fuel and food) that is proportional to the mass of the component. But I am able to recognize that the psychological premises on which the system is based are an untenable illusion. Here is an example of constructive criticism for an employee during a performance review: You mentioned your feelings about the amount of time it takes you to complete a project. How about sending me daily updates so I know where we are?". It can be helpful to understand this context, and use it to help further develop and experimentally test a theory of constructal mechanics. The constructal law governs how the system emerges and persists: by generating a flow architecture that distributes imperfections River basins evolve in time, and generate their area-to-point dendritic architectures in accordance with the constructal law. A constructal design feature that unites many of the natural flow configurations is that there is more than one mechanism at the disposal of the currents that must flow. the soil of the hill slope in a river drainage basin, where two scales dominate: fine porous soil with seepage, and larger pores (pipes) embedded in the fine structure). [PDF] Constructal law | Semantic Scholar Self-lubrication is a constructal phenomenon, like the self-shaping for drag reduction, which is visible in the round cross sections of all the veins that we observe (earth worms, blood vessels, subterranean rivers now visited as caves). The engine and its immediate environment (the brake), as one thermodynamic system, are analogous to the entire Earth (figure4). La rgion Hauts-de-France somme de verser des subventions un lyce Blacks, Jews, gays, womenthey will no longer tolerate second-class status. Design in Nature: How the Constructal Law Governs Evolution in Biology The resulting dendritic pattern is asymmetric; however, its random appearance is due to the unknown (random) geological properties of the domain, and not to a random tendency of generating configuration. ; The constructal law is the physics law of life, design and evolution. Let's set up a weekly team meeting where we can discuss our current projects and do some brainstorming activities.". They occur and survive in order to facilitate groundair mass transfer (Bejan 2006, p. 770). The phenomenon and principle of configuration generation and evolution is what the constructal law brings to thermodynamics. Providing actionable advice is the main factor that separates constructive and deconstructive criticism, and it gives the aspect of focusing more on the future than the past. This constructal forest of multi-scale trees reveals a Zipf distribution of tree sizes versus tree rank, and tree sizes versus numbers of trees of the same size. Ivan is a Senior Associate at Valamis with over eleven years of experience in online marketing. The theory is based on what Professor Adrian Bejan of Duke University describes as Constructal Law: For a finite-size flow system to persist in time (to live), it must evolve with freedom in such a way that it provides easier access to the imposed currents that flow through it. A great way to do this is to ask the employees how they feel about their performance in areas you think need improvement. The constructal law has two useful sides: the prediction of natural phenomena and the strategic engineering of novel architectures, based on the constructal law, i.e. A 2020 study shows that negative feedback that focuses on past mistakes isnt as efficient. This work was supported by a grant from the National Science Foundation. transportation and manufacturing for man, animal locomotion and body heat loss to ambient). It can be fascinating to consider all these examples, but I think the focus on descriptive examples is both too much and not enough for the stewards of the standard model to pay attention to. When discussing this issue, refrain from focusing on the employee. Constructal law is a theory of the generation of design (configurations, patterns, geometry) in nature. from the top of figure6) sees a few large pores surrounded by many small pores. Negative attitudes can create hostile environments. They seek vindication for past grievances in the trials that take place today, the new political trial.George P. Fletcher, U.S. law educator. It is flow, and not growth, that generates form. This review paper summarizes constructal design progress performed by the authors for eight types of heat sinks with ten performance indexes being taken as the optimization objectives, respectively, by combining the methods of theoretical analysis and numerical calculation. Is constructal theory complete and utter BS? : r/Physics - reddit Constructal Law: Optimization as Design Evolution When constructive criticism is needed to help a person grow their skills. The second criticism of constructal theory is that there has been no attempt to prove it from first principles. Indicate your praise for progress made along the way to show you're on their side and invested in their accomplishment. The best organ is not the one recommended by the thermodynamics of the organ alone: that would be infinitely large. The structure has one degree of freedom, the tube diameter D, or the number of parallel tubes. one way. How is this flow of heat facilitated in nature? Focusing on the situation or behavior rather than the person can help prevent the receiver from feeling personally attacked. It also reframes the view that life on Earth began with the rise of primitive species some 3.5 billion years ago. The building block with which figure6 is constructed was proposed by Lorente et al. The constructal law of organization in nature: tree-shaped flows and If you see an employee gossiping or engaging in other unprofessional conduct, discuss it with them one on one. Vehicle design is evolving right now, on design tables and in factories. Maximization (sic) of flow resistance is used regularly in physiology and engineering, e.g. The last thing I want is for it to hinder your overall performance. However, in the case that someone else may need a helping hand, you should show off your skills and aid others by sharing your expertise. By providing top brand names, personal service, and priding ourselves on integrity and . Trees and snowflakes puzzle the mind because they are solid structures, and not fluid. upward in figure6. In the last column of table1, we used b = 0.5 to show in dimensionless terms that the constructal architecture also anticipates the trend correlated by Hack. Figure4 also holds for the whole Earth, as a closed (note: closed does not mean isolated) thermodynamic system. You owe it to the partner to give a real example of the problem. Frequencies (stride, flapping, fishtailing) proportional to, All the animal mass that flows has evolved into the same. Delivering critique and discussing areas that need improvement can lead to diminished motivation, negative feelings, and disengagement. The constructal law defines life in physics terms, and it covers all live-system phenomena. This phenomenon is summarized by the constructal law: the occurrence and evolution of designs in nature, its time direction. Bonus points for unifying quantum mechanics and gravity, a la general relativity. Earth, with its solar heat input, heat rejection and wheels of atmospheric and oceanic circulation, is a heat engine without shaft. of everything) have this unifying power. Though constructive criticism itself is not always positive, you should give it with a positive attitude. The fluid flows in the same direction through all the trees, e.g. Weinberg dismisses these beautiful and ubiquitous asymmetries in nature as chaos, and the intrusion of historical accidents. Stephen Hawking dismissed the complexity of nature as trivial and unimportant details, attributing it entirely to the uncertainty principle. Allow them to question why you feel that way and how they can improve based on your comments. You are always a great help during brainstorming sessions. Constructal law of vascular trees for facilitation of flow. The so-called "constructal law" is a fringe theory heavily promoted by a single individual and virtually no one else. The Constructal Law is about this, the natural occurrence and evolution of flow configurations. The best lung is compact, svelte and imperfect: it destroys exergy by fluid friction. The engine shown in figure4 can be any engine, optimized or not, ideal (Carnot) or not ideal. Indeed, it must apply universally, or be rejected as a law of nature. the display of certain parts of an article in other eReaders. To the extent it can . The natural phenomenon of configuration generation and the constructal law does not recognize the presumed walls between geophysical flow systems (river basins, lightning, turbulence, atmospheric and oceanic circulation), biological flow systems (animals, vegetation), social dynamics and technology. Summary. 2008). User Push vs. Market Pull - Institute for Constructal Infonomics Dont make general comments. It would be fantastic to see you use your creativity to solve problems before asking for help. It considers several bio and nonbio natural . A corollary that undergirds all of our designs is . ; The constructal law states that every flow system is destined to remain imperfect. Ive noticed that youve spent a lot of time troubleshooting and problem-solving in past projects. Constructal Theory - Responses To Criticisms of The Constructal Law The cost of carrying the component on board is proportional to the mass of the component. For example, contrary to the critic's view, the first and second laws of thermodynamics did not require any "proof based on simplified systems of statistical physics." The tree must be self-healing to survive strong winds, ice accumulation on branches and animal damage. Keywords: This gives the impression that nature makes mistakes, but to think this way is to miss the big picture. (, The theoretical structure of constructal river basins (, The flying speeds of insects, birds and human and machine species (e.g. Both phenomena achieve greater flow access through the generation of design, in time and in space. Not mentioned in thermodynamics (until now) is the fact that W is itself dissipated into the ambient, because of the movement of vehicle weight (Mg) over the horizontal distance L. To summarize, all the high-temperature heating that comes from burning fuel (QH or the exergy associated with QH and the high temperature of combustion; cf. To achieve this, they combine two flow mechanisms in a particular way. Here, I review the physics meaning of optimization, knowledge and design evolution, and why these concepts and human activities are profoundly useful for human life. All thermodynamic systems in nature are flow systems (i.e. Trees of all sizes are extended surfaces through which the ground water finds greater access to the atmosphere, so that the water completes its circuit in nature. But the bias and blindspots in premiere physics institutions demonstrate a tendency to ignore such matters, casually writing it off as complexity, chaos, or trivial and unimportant. The constructal law, if it holds true, applies beyond 'engineering, scientific, and social systems.'. Figure3 illustrates this scaling by using all the known flyers (insects, birds, airplanes). The constructal law is a useful reminder not only of what was missing in physics and thermodynamics (the law of design and evolution) but also of what is present. The constructal law is a useful reminder not only of what was missing in physics and thermodynamics (the law of design and evolution) but also of what is present. Philos Trans R Soc Lond B Biol Sci. The demand to pass water is also made clear by the dendritic architecture, which according to the constructal law facilitates flow access between one point and a finite-size volume (1). The constructal law has been used to account for many features of design in nature, from the tree-shaped flows of lungs and river basins, to the scaling laws of animal design, river basin design and social dynamics: for reviews, see Bejan (2000), Poirier (2003), Reis (2006) and Bejan & Lorente (2006). River basins of all sizes are united by firmly established empirical rules (Rosa et al. Like any other law of physics, the constructal law is a concise summary of observed facts: the natural tendency of flow systems to evolve toward configurations that provide easier access over time. Constructal Law This brings me to Constructal Law developed by Adrian Bejan, Professor of Mechanical Engineering at Duke University in the US. Create a company page In a motionless fluid medium at a temperature slightly below the solidification temperature, latent heat is released at the solidification site and flows into the subcooled medium (Bejan 1997; Ciobanas et al. Adrian Bejan, professor of materials science and mechanical engineering at Duke University, explains how constructal law underpins the natural organization a. Biological systems are configured. One of the most important principles of energy is that it . The shear plane becomes enveloped in a layer of thickness D that increases in time. Constructal Law: Optimization as Design Evolution Is There Really A Fourth Neutrino Out There In The Universe? He writes of hundreds of familiar phenomena from academia and aircraft to water, wealth and wind. The dendritic structure of the snowflake makes it easier for the heat currents to flow from small areas to the entire volume (Bejan 1997). A phenomenon is a fact, circumstance, or experience that is apparent to the human senses and can be described. The constructal law states that channel structures evolve over time to do two things: provide the most efficient paths for flows moving through them and maximize their freedom to morph (change. It was based initially on steam power, for industrial use. This correlation is meant broadly speaking, because the broad view is the key to discovering the pattern, in spite of the obvious and overwhelming diversity (random effects, local geographical variation, winds, atmospheric humidity). This remarkable positioning of diffusive interstices relative to penetrating needles is the design, the white on which the black lines are drawn. heat leaks) all the mechanical power that it produces. PDF Critique of Constructal Theory - Cambridge Scholars Publishing We are experimenting with display styles that make it easier to read articles in PMC. This direction is constructal design, and with it we seek not only better flowing configurations but also better (faster, cheaper, direct, reliable) strategies for generating the geometry that is missing from the black-box sketches. With reference to the engine model at the start of 2, the vehicle motor burns fuel in proportion to the high-temperature heating rate QH. Generating an ePub file may take a long time, please be patient. Let's set aside some time to discuss your objectives and duties and what you need from me to achieve those, so we're all on the same page.. Perhaps this is an area that is slowing you down. Theoretical physics is focused on the most fundamental principles, in the search for a unified theory of nature. Dendritic solidification (e.g. We showed this by exploring the flow properties of the dendritic flow architecture proposed in figure6. Every flow component of the Earth functions as an engine that drives a brake (Bejan & Paynter 1976; Bejan 1982, 2006). Constructal theory is the view that (i) the generation of images of design (pattern, rhythm) in nature is a phenomenon of physics and (ii) this phenomenon is covered by a principle (the constructal law): for a finite-size flow system to persist in time (to live) it must evolve such that it provides greater and greater access to the currents that flow through it. Every flow component of the Earth functions as an engine that drives a brake (Bejan & Paynter 1976; Bejan 1982, 2006). 2006). The universality of the design phenomenon and the constructal law is highlighted by the three questions formulated in the motto to this paper. twitter.com This alignment was generalized more recently to include all runners and swimmers over the same range of body masses (Bejan & Marden 2006a,b). To have the most effective discussion, take the time to sit down and talk. We have a wide range of authors and publishers in our portfolio. These are in very good agreement with the measured scaling laws of river basins all over the world. For example, from this proportionality follows Leonardo da Vinci's rule, which is the observed conservation of wood cross-sectional area during branching (the lower trunk cross section equals the upper trunk cross section plus the cross section of the branch). He was cited for "his pioneering contributions to modern thermodynamics and "Constructal Law" - a law of physics that predicts natural design and its evolution in biology, geophysics, climate change, technology, social organization, evolutionary design and development, wealth and sustainability". The constructal law and the evolution of design in nature nature by design Full Book In 2018 he was awarded the Benjamin Franklin Medal for his work in thermodynamics and constructal theory, which predicts natural design and its evolution in engineering, scientific, and social systems.. Rather than tearing something down, constructive criticism focuses on improving it. We relied solely on the constructal law in order to discover all the main features of plants, from root and canopy to forest (Bejan & Lorente 2008; Bejan et al. Contrarily to alternative theories of non-equilibrium thermodynamics, there is no proof of constructal theory based on simplified systems of statistical physics. In addition, the early adopter strategy analysis could be applicable to a wide range of business cases. Performance evaluations are a great opportunity to assess the team's output.

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