Adrian Bejan

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Constructal Theory of Flying, Running and
Swimming
Adrian Bejan J. A. Jones Distinguished
Professor Duke University
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The generation of configuration is a physics
phenomenon Natural flow configurations tree
networks locomotion global circulation and
climate The constructal law
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W2
W1
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Vertical loss
Horizontal loss
M body mass Lb body length H
ra air density rb body density
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A. Bejan, Shape and Structure, from Engineering
to Nature, Cambridge University Press, 2000.
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A. Bejan and S. Lorente, ASME Paper,
IMECE2003-33158
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Vertical loss
Horizontal loss
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Vertical loss
Horizontal loss
Give me one firm spot on which to stand, and I
will move the earth
(Archimedes, 287-212 B.C.)
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A. Bejan and J. H. Marden, J. Exp. Biol. 209
(2006) 238-248.
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A. H. Reis and A. Bejan, Int. J. Heat Mass
Transfer 49 (2006)
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Constructal law (1996) For a flow system to
persist in time (to survive) it must evolve in
such a way that it provides easier and easier
access to the currents that flow through it.
This new law of physics stands behind all
phenomena of configuration generation Darwins
observations Machine evolution (human machine
species) River basin evolution, atmospheric
circulation, climate, lightning, vascularization,
vegetation, animals, turbulent flow, dendritic
crystals, social organization, etc.
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