Why do countercurrents not reach thermal equilibrium

Structure formation in liquids and gases

The Self-Structuring of Matter pp 252-344 | Cite as

  • Hermann hook
  • Arne Wunderlin


Liquids and gases are so naturally available materials and used for all kinds of purposes in our everyday lives that we are seldom aware of the fundamental importance of their dynamics, especially in the design of our everyday life. However, if we find enough leisure, we can, for example, turn to the aesthetic manifestations of this dynamic. Structures that particularly affect this aesthetic sensation can be made visible in flow experiments with liquids. Fig. 6.1, for example, shows the formation of a vortex street, which can be obtained under carefully defined test conditions in which a rod is pulled as evenly as possible through a liquid. But not only ordered structures can be identified, such as on the water surface in Fig. 6.2, where different forms of order (flow patterns) meet. Completely disordered flow patterns, such as the fully developed turbulent flow behind a grid shown in Fig. 6.3, can also be observed. In this chapter we want to gain an understanding of the unusual variety of patterns that occur here, without, however, losing sight of their special significance for practice.

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Copyright information

© Springer Fachmedien Wiesbaden 1991

Authors and Affiliations

  • Hermann hook
  • Arne Wunderlin
  1. 1. Institute for Theoretical Physics and Synergetics, University of Stuttgart, Stuttgart 80, Germany