Transient Dynamics of Concentrated Particulate Suspensions Under Shear

Endao Han (Autor)

Buch | Hardcover

XVI, 96 Seiten

2020 | 1st ed. 2020
Springer International Publishing (Verlag)
978-3-030-38347-3 (ISBN)

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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.

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

Chapter1. Introduction.- Chapter2. Ultrasound techniques for studying suspensions.- Chapter3. Investigating impact-activated fronts with ultrasound.- Chapter4. Modeling shear fronts in one dimension.- Chapter5. Rheology in the shear jamming regime.- Chapter6. Conclusions and outlook.

Erscheinungsdatum	14.03.2020
Reihe/Serie	Springer Theses
Zusatzinfo	XVI, 96 p. 33 illus., 32 illus. in color.
Verlagsort	Cham
Sprache	englisch
Maße	155 x 235 mm
Gewicht	342 g
Themenwelt	Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik
	Naturwissenschaften ► Physik / Astronomie ► Festkörperphysik
	Naturwissenschaften ► Physik / Astronomie ► Thermodynamik
Schlagworte	Dense Suspensions • dynamic jamming • fluid- and aerodynamics • shear jamming • steady-state rheology • Transient dynamics of dense suspensions • ultrasound imaging of suspensions • Wyart-Cates model
ISBN-10	3-030-38347-4 / 3030383474
ISBN-13	978-3-030-38347-3 / 9783030383473
Zustand	Neuware