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Time-Symmetry Breaking in Turbulent Multi-Particle Dispersion (Paperback, Softcover reprint of the original 1st ed. 2015)
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Time-Symmetry Breaking in Turbulent Multi-Particle Dispersion (Paperback, Softcover reprint of the original 1st ed. 2015)
Series: Springer Theses
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This thesis presents experimental and theoretical investigations of
the connection between the time asymmetry in the short-time
evolution of particle clusters and the intrinsic irreversibility of
turbulent flows due to the energy cascade. Â The term
turbulence describes a special state of a continuous medium in
which many interacting degrees of freedom are excited. One of the
interesting phenomena observed in turbulent flows is their time
irreversibility. When milk is stirred into coffee, for example,
highly complex and interwoven structures are produced, making the
 mixing process irreversible.  This behavior can be
analyzed in more detail by studying the dispersion of particle
clusters. Previous experimental and numerical studies on the time
asymmetry in two-particle dispersion indicate that particles
separate faster backwards than forwards in time, but no conclusive
explanation has yet been provided. Â In this thesis, an
experimental study on the short-time behavior of two- and
four-particle dispersion in a turbulent water flow between two
counter-rotating propellers is presented. A brief but rigorous
theoretical analysis reveals that the observed time irreversibility
is closely linked to the turbulence energy cascade. Additionally,
it is demonstrated experimentally that the addition of minute
amounts of polymers to the flow has a significant impact on
multi-particle dispersion due to an alteration of the energy
cascade.
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