Now showing items 1-17 of 17

    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • The evolution of airplanes 

      Bejan, A; Charles, JD; Lorente, S (Journal of Applied Physics, 2014-07-28)
      The prevailing view is that we cannot witness biological evolution because it occurred on a time scale immensely greater than our lifetime. Here, we show that we can witness evolution in our lifetime by watching the evolution ...
    • The evolution of helicopters 

      Chen, R; Wen, CY; Lorente, S; Bejan, A (Journal of Applied Physics, 2016-07-07)
      Here, we show that during their half-century history, helicopters have been evolving into geometrically similar architectures with surprisingly sharp correlations between dimensions, performance, and body size. For example, ...
    • The evolutionary design of condensers 

      Bejan, A; Lee, J; Lorente, S; Kim, Y (Journal of Applied Physics, 2015-01-01)
      © 2015 AIP Publishing LLC. Condensers are flow architectures needed to provide high rates of condensation (or cooling) per unit volume, in enclosures with fixed volume. Their design has not changed from configurations consisting ...
    • The robustness of the permeability of constructal tree-shaped fissures 

      Alalaimi, M; Lorente, S; Wechsatol, W; Bejan, A (International Journal of Heat and Mass Transfer, 2015-07-06)
      © 2015 Elsevier Ltd. Here we develop analytically the formulas for effective permeability in several configurations using the closed-form description of tree networks designed to provide flow access. The objective was to ...
    • Thermal coupling between a helical pipe and a conducting volume 

      Alalaimi, M; Lorente, S; Bejan, A (International Journal of Heat and Mass Transfer, 2015-01-01)
      © 2014 Elsevier Ltd. All rights reserved. Here we document the effect of flow configuration on the heat transfer performance of a helically shaped pipe embedded in a cylindrical conducting volume. The helix is wrapped on ...
    • Vascular structures for volumetric cooling and mechanical strength 

      Wang, KM; Lorente, S; Bejan, A (Journal of Applied Physics, 2010-03-15)
      When solid material is removed in order to create flow channels in a load carrying structure, the strength of the structure decreases. On the other hand, a structure with channels is lighter and easier to transport as part ...
    • Vascularization for cooling and reduced thermal stresses 

      Cetkin, E; Lorente, S; Bejan, A (International Journal of Heat and Mass Transfer, 2015-01-01)
      © 2014 Elsevier Ltd. All rights reserved. This paper documents the effect of thermal expansion on a vascularized plate that is heated and loaded mechanically. Vascular cooling channels embedded in a circular plate provide ...