Time-Symmetry Breaking in Turbulent Multi-Particle Dispersion / by Jennifer Jucha.

Format:

Book

Author/Creator:

Jucha, Jennifer., Author.

Series:

Springer Theses, Recognizing Outstanding Ph.D. Research, 2190-5053

Language:

English

Subjects (All):

Statistical physics.

Fluids.

Amorphous substances.

Complex fluids.

Fluid mechanics.

Chemistry, Physical and theoretical.

Applications of Nonlinear Dynamics and Chaos Theory.

Fluid- and Aerodynamics.

Soft and Granular Matter, Complex Fluids and Microfluidics.

Engineering Fluid Dynamics.

Physical Chemistry.

Local Subjects:

Applications of Nonlinear Dynamics and Chaos Theory.

Fluid- and Aerodynamics.

Soft and Granular Matter, Complex Fluids and Microfluidics.

Engineering Fluid Dynamics.

Physical Chemistry.

Physical Description:

1 online resource (121 p.)

Edition:

1st ed. 2015.

Place of Publication:

Cham : Springer International Publishing : Imprint: Springer, 2015.

Language Note:

English

Summary:

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. 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. 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.

Contents:

Motivation

Introduction and Theory

Experimental Methods,- Two-Particle Dispersion

Four-Particle Dispersion

The Effect of Polymers

Discussion and Perspectives.

Notes:

"Doctoral Thesis accepted by the University of Göttigen, Germany."

Includes bibliographical references at the end of each chapters.

ISBN:

3-319-19192-6