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Über dieses Buch

The fascinating rainbow colors we see in soap film not only delight us; they also help us understand the physical essence of nature. In this dissertation, the author presents his studies on the interactions between flexible bodies and ambient fluids, a topic reflected in nature, in everyday life and in various industrial applications. By investigating this topic, he reveals the mechanism of flow-induced vibration of flexible bodies, the process of energy exchange between flexible bodies and fluids and the way flexible bodies interact with each other in flowing fluids. These studies not only allow us to understand nature better, but can also help us invent new machines and improve existing devices to glean more energy from nature.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract
In this chapter, the background of this thesis is introduced. The interaction between flexible plates and fluid is an important multidisciplinary research topic. The studies of the interactions between flexible plates and fluids and the development of soap film tunnels are reviewed. The research topics discussed in this thesis are given.
Laibing Jia

Chapter 2. Experimental Apparatuses and Measurements

Abstract
In order to study the interactions between flexible plates and two-dimensional flow, a steady and uniform two-dimensional flow is required. In our studies, soap film tunnels are employed to provide such two-dimensional flow. The flow structure in the flow field is revealed by optical methods. In this chapter, the structure of soap film tunnels are introduced. All the experiments discussed in this thesis were carried out using these devices. Flow visualization method, the measurements of physical parameters and properties of the soap film and filaments are also introduced in this chapter.
Laibing Jia

Chapter 3. Flapping of a Single Plate in Uniform Flow

Abstract
This chapter mainly discussed the flapping of a single filament in flowing soap film as a model of one-dimensional flexible plate in two-dimensional flow. The connection methods of filaments, flapping characteristics, experimental data processing method, the calculation of force and energy, and model for stability analysis are given in details in this chapter. The study of a single filament provides the fundamental theoretical and experimental methods for analysing more complex problems addressed in the following chapters.
Laibing Jia

Chapter 4. Interaction Between Two Parallel Plates in Flow

Abstract
This chapter discusses the interaction between two parallel plates in a two-dimensional flow. The coupling of two parallel plates belongs to one of the common interface coupling problems. In this chapter, flexible filaments and flowing soap film are employed to study their coupling. A simplified model is proposed to describe the coupling problem. The dispersion relationship is obtained by a temporal linear instability analysis. Two special cases of flapping coupling, i.e. two identical filaments having the same length and two filaments having different lengths, are studied in detail. Relevant experiments are carried out in a soap film tunnel and the stable and unstable modes are observed. Comparison between theoretical predictions and experimental results is discussed in detail.
Laibing Jia

Chapter 5. Interaction Between Two Tandem Plates in Flow

Abstract
Two flexible plates arranged in serial in flow interact with each other by the flow field. In this chapter, two tandem filaments are placed in a flowing soap film to investigate the interaction between them. The common tandem structures and the physical problem involved in the interaction in them are introduced first. Then the experimental study using filaments and soap film to investigate the interaction between the flexible filaments and flow is discussed. The experimental data is fitted for the calculation on the force and energies. The calculation results are given at last.
Laibing Jia

Chapter 6. Locomotion Modes of a Plate in the Wake of a Cylinder

Abstract
A flexible plate located in the wake of an obstacle is usually forced to vibrate by the periodic vortices shedding from the obstacle. In this chapter, a flexible filament is placed in the wake of a cylinder to investigate the response of a flexible plate in the wake. The force is measured by two methods. The filaments exhibit lock-in behaviour to the wake. Three response modes are found by changing the distance between the filaments and cylinders. The observations are illustrated in terms of waving plate theory.
Laibing Jia

Chapter 7. Summary and Outlook

Abstract
In this chapter, the major conclusions are summarized. Future work that relates to the studies in this thesis is recommended.
Laibing Jia
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