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Transient Dynamics of Concentrated Particulate Suspensions Under Shear

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  • © 2020
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Overview

Authors:
  1. Endao Han

    1. Joseph Henry Laboratories of Physics, Princeton University, Princeton, USA

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  • Nominated as an outstanding PhD Thesis by the University of Chicago
  • Presents a major breakthrough in the understanding of dense suspensions with industrial applications
  • Demonstrates the first use of high-speed ultrasound imaging to track transitions in suspensions
  • Develops new models for the behavior of suspensions

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (6 chapters)

  1. Front Matter

    Pages i-xvi
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  2. Introduction

    • Endao Han
    Pages 1-9
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  3. Ultrasound Techniques for Studying Suspensions

    • Endao Han
    Pages 11-25
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  4. Investigating Impact-Activated Fronts with Ultrasound

    • Endao Han
    Pages 27-39
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  5. Modeling Shear Fronts in One Dimension

    • Endao Han
    Pages 41-60
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  6. Rheology in the Shear Jamming Regime

    • Endao Han
    Pages 61-70
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  7. Conclusions and Outlook

    • Endao Han
    Pages 71-73
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  8. Back Matter

    Pages 75-96
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Keywords

About this book

This thesis demonstrates the first use of high-speed ultrasound imaging to non-invasively probe how the interior of a dense suspension responds to impact. Suspensions of small solid particles in a simple liquid can generate a rich set of dynamic phenomena that are of fundamental scientific interest because they do not conform to the typical behavior expected of either solids or liquids. Most remarkable is the highly counter-intuitive ability of concentrated suspensions to strongly thicken and even solidify when sheared or impacted. The understanding of the mechanism driving this solidification is, however, still limited, especially for the important transient stage while the response develops as a function of time. In this thesis, high-speed ultrasound imaging is introduced to track, for the first time, the transition from the flowing to the solidified state and directly observe the shock-like shear fronts that accompany this transition. A model is developed that agrees quantitativelywith the experimental measurements. The combination of imaging techniques, experimental design, and modeling in this thesis represents a major breakthrough for the understanding of the dynamic response of dense suspensions, with important implications for a wide range of applications ranging from the handling of slurries to additive manufacturing.

Authors and Affiliations

  • Joseph Henry Laboratories of Physics, Princeton University, Princeton, USA

    Endao Han

About the author

Endao Han is an Associate Research Scholar and CPBF Fellow at Princeton University. He received his PhD from the University of Chicago in 2018.

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