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An Experimental Study of Mixing Dyna...

Zaman, Zafir.

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An Experimental Study of Mixing Dynamics in 3D Granular Flows.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	An Experimental Study of Mixing Dynamics in 3D Granular Flows./
作者:	Zaman, Zafir.
面頁冊數:	170 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.
Contained By:	Dissertation Abstracts International78-02B(E).
標題:	Chemical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10160388
ISBN:	9781369152968

An Experimental Study of Mixing Dynamics in 3D Granular Flows.
Zaman, Zafir.

An Experimental Study of Mixing Dynamics in 3D Granular Flows. - 170 p.

Source: Dissertation Abstracts International, Volume: 78-02(E), Section: B.

Thesis (Ph.D.)--Northwestern University, 2016.

Compared with the mixing of fluids, the mixing and segregation of granular materials remains one of the big questions of science. Unlike fluids, granular materials segregate based on differences in particle properties, such as density and size. For 2D granular flows, a dynamical systems framework has been effective in describing regions of mixing and segregation. However, computational and theoretical results are just starting to form a framework for 3D granular flows, such as the bi-axial spherical tumbler (BST) flow. This thesis builds on this emerging framework through a series of experimental studies with theoretical and model support with the goal of better understanding 3D mixing. The first study tests the commonly used assumption in continuum models of granular flow that single axis tumbler flow is two dimensional. Utilizing both surface and destructive subsurface imaging, this study shows that weak 3D deviations occur in the form of an axial drift within single axis tumbler flow of varying material spanwise depth. Afterward, this thesis focuses on the development of a custom-built X-ray imaging system to non-destructively visualize the tumbler subsurface. The second study revisits the axial drift and demonstrates that wall roughness impacts the curvature and overall displacement of particle trajectories throughout the tumbler domain using subsurface particle trajectories provided by the X-ray imaging system. Finally, mixing in the fully 3D BST flow is studied. In particular, 3D persistent mixing barriers that are predicted by the dynamical systems framework are shown to exist. Some barriers are remarkably persistent for as much as 500 protocol iterations despite the presence of collisional diffusion. The structures arise from two competing effects, the cutting and shuffling action of the protocol and the stretching from the flowing layer. The tumbling protocol controls the mixing behavior as well as the types of non-mixing barriers observed. Supplementary files are available online which include code to operate the X-ray system and process experimental datasets, code for continuum model and piecewise isometry simulations, and the X-ray system standard operating procedure.

ISBN: 9781369152968Subjects--Topical Terms:

560457
Chemical engineering.

An Experimental Study of Mixing Dynamics in 3D Granular Flows.
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500 $a Includes supplementary digital materials.
500 $a Advisers: Richard M. Lueptow; Julio M. Ottino.
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520 $a Compared with the mixing of fluids, the mixing and segregation of granular materials remains one of the big questions of science. Unlike fluids, granular materials segregate based on differences in particle properties, such as density and size. For 2D granular flows, a dynamical systems framework has been effective in describing regions of mixing and segregation. However, computational and theoretical results are just starting to form a framework for 3D granular flows, such as the bi-axial spherical tumbler (BST) flow. This thesis builds on this emerging framework through a series of experimental studies with theoretical and model support with the goal of better understanding 3D mixing. The first study tests the commonly used assumption in continuum models of granular flow that single axis tumbler flow is two dimensional. Utilizing both surface and destructive subsurface imaging, this study shows that weak 3D deviations occur in the form of an axial drift within single axis tumbler flow of varying material spanwise depth. Afterward, this thesis focuses on the development of a custom-built X-ray imaging system to non-destructively visualize the tumbler subsurface. The second study revisits the axial drift and demonstrates that wall roughness impacts the curvature and overall displacement of particle trajectories throughout the tumbler domain using subsurface particle trajectories provided by the X-ray imaging system. Finally, mixing in the fully 3D BST flow is studied. In particular, 3D persistent mixing barriers that are predicted by the dynamical systems framework are shown to exist. Some barriers are remarkably persistent for as much as 500 protocol iterations despite the presence of collisional diffusion. The structures arise from two competing effects, the cutting and shuffling action of the protocol and the stretching from the flowing layer. The tumbling protocol controls the mixing behavior as well as the types of non-mixing barriers observed. Supplementary files are available online which include code to operate the X-ray system and process experimental datasets, code for continuum model and piecewise isometry simulations, and the X-ray system standard operating procedure.
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