Now showing items 1-20 of 32

    • Arrays of flow channels with heat transfer embedded in conducting walls 

      Bejan, A; Almerbati, A; Lorente, S; Sabau, AS; Klett, JW (International Journal of Heat and Mass Transfer, 2016-08-01)
      Here we illustrate the free search for the optimal geometry of flow channel cross-sections that meet two objectives simultaneously: reduced resistances to heat transfer and fluid flow. The element cross section and the wall ...
    • Artificial intelligence evolution in smart buildings for energy efficiency 

      Farzaneh, H; Malehmirchegini, L; Bejan, A; Afolabi, T; Mulumba, A; Daka, PP (Applied Sciences (Switzerland), 2021-01-02)
      © 2021 by the authors. Licensee MDPI, Basel, Switzerland. The emerging concept of smart buildings, which requires the incorporation of sensors and big data (BD) and utilizes artificial intelligence (AI), promises to usher ...
    • Cell and extracellular matrix growth theory and its implications for tumorigenesis. 

      Sauer, TJ; Samei, E; Bejan, A (Bio Systems, 2021-03)
      Cells associated with an abnormal (cancerous) growth exchange flows, morph freely and grow hand-in-glove with their immediate environment, the extracellular matrix (ECM). The cell structure experiences two mass flows in ...
    • Constructal dendritic configuration for the radiation heating of a solid stream 

      Kang, DH; Lorente, S; Bejan, A (Journal of Applied Physics, 2010-06-01)
      Here we show that the configuration of a slender enclosure can be optimized such that the radiation heating of a stream of solid is performed with minimal fuel consumption at the global level. The solid moves longitudinally ...
    • Constructal design of evacuation from a three-dimensional living space 

      Lui, CH; Fong, NK; Lorente, S; Bejan, A; Chow, WK (Physica A: Statistical Mechanics and its Applications, 2015-03-15)
      © 2014 Elsevier B.V. All rights reserved. This paper demonstrates the fundamental relation that exists between the configuration of a three-dimensional living space and the time needed for the evacuation of all the inhabitants. ...
    • Constructal design of gas-cooled electric power generators, self-pumping and atmospheric circulation 

      Bejan, A; Lorente, S; Lee, J; Kim, Y (International Journal of Heat and Mass Transfer, 2015-08-24)
      © 2015 Elsevier Ltd. All rights reserved. Rotating electric machines generate heat volumetrically, and are cooled by forced convection aided by the self-pumping effect. In this paper we focus on the fundamental relationship ...
    • Constructal design of salt-gradient solar pond fields 

      González, D; Amigo, J; Lorente, S; Bejan, A; Suárez, F (International Journal of Energy Research, 2016-08-01)
      © 2016 John Wiley & Sons, Ltd. Salt-gradient solar ponds (SGSPs) are water bodies that capture and accumulate large amounts of solar energy. The design of an SGSP field has never been analyzed in terms of studying the optimal ...
    • Constructal Law: Optimization as Design Evolution 

      Bejan, A (Journal of Heat Transfer, 2015-06-01)
      Copyright © 2015 by ASME. 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. A law of physics is a concise ...
    • Constructal thermodynamics 

      Bejan, A (International Journal of Heat and Technology, 2016-01-01)
      Thermodynamics is brief, simple, unambiguous and improving. Yet, confusion reigns in the field. The word "entropy" is pasted on almost any new thing, without any respect for its proper definition in thermodynamics. Every ...
    • Counterflow heat exchanger with core and plenums at both ends 

      Bejan, A; Alalaimi, M; Lorente, S; Sabau, AS; Klett, JW (International Journal of Heat and Mass Transfer, 2016-08-01)
      This paper illustrates the morphing of flow architecture toward greater performance in a counterflow heat exchanger. The architecture consists of two plenums with a core of counterflow channels between them. Each stream ...
    • Energy design for dense neighborhoods: One heat pump rejects heat, the other absorbs heat from the same loop 

      Almerbati, A; Lorente, S; Bejan, A (International Journal of Thermal Sciences, 2015-06-29)
      © 2015 Elsevier Masson SAS. This paper documents the joint performance of heat pumps that are served by a common loop buried in the ground, and which operate simultaneously: one heat pump absorbs heat from the buried loop ...
    • Entrance-length dendritic plate heat exchangers 

      Bejan, A; Alalaimi, M; Sabau, AS; Lorente, S (International Journal of Heat and Mass Transfer, 2017-01-01)
      © 2017 Elsevier Ltd. Here we explore the idea that the highest heat transfer rate between two fluids in a given volume is achieved when plate channel lengths are given by the thermal entrance length, i.e., when the thermal ...
    • EVOLUTION AND THE CITY 

      Bejan, A (MECHANICAL ENGINEERING, 2017-02)
    • Evolution as Physics: The Human & Machine Species 

      Bejan, A (European Review, 2016-12-20)
      Humans and technology are not in symbiosis. They are one species, not two. Humans, enveloped in artefacts of many kinds and ages (from writing, to airplanes), are evolving as one species, the ‘human & machine species’. This ...
    • Heatlines (1983) versus synergy (1998) 

      Bejan, A (International Journal of Heat and Mass Transfer, 2015-01-01)
      © 2014 Elsevier Ltd. All rights reserved. A picture is worth a thousand words. This article is about a picture known as "heatlines" since 1983, and "synergy" since 1998. Both concepts, heatlines and synergy, are about visualizing ...
    • Letter to the editor of renewable and sustainable energy reviews 

      Bejan, A (Renewable and Sustainable Energy Reviews, 2016-01-01)
    • Morphing the design to go with the times 

      Bejan, A; Gucluer, S (International Communications in Heat and Mass Transfer, 2021-01-01)
      © 2020 Elsevier Ltd 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 ...
    • Morphing tree structures for latent thermal energy storage 

      Ziaei, S; Lorente, S; Bejan, A (Journal of Applied Physics, 2015-06-14)
      © 2015 AIP Publishing LLC. Here, we report the numerical study of time dependent storage of energy by melting a phase change material. The heating is provided along invading lines, which change from single-line invasion ...
    • Nationalism and forgetfulness in the spreading of thermal sciences 

      Bejan, A (International Journal of Thermal Sciences, 2021-05-01)
      © 2020 Elsevier Masson SAS This is a review of several key ideas and pioneers in the founding history of thermodynamics, fluid dynamics and heat transfer. Ideas treated in detail are the mechanical equivalent of heat, the ...
    • Natural constructal emergence of vascular design with turbulent flow 

      Cetkin, E; Lorente, S; Bejan, A (Journal of Applied Physics, 2010-06-01)
      Here, we show that vascular design emerges naturally when a volume is bathed by a single stream in turbulent flow. The stream enters the volume, spreads itself to bathe the volume, and then reconstitutes itself as a single ...