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You searched for +publisher:"University of Twente" +contributor:("Thornton, Anthony Richard"). Showing records 1 – 2 of 2 total matches.

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1. Denissen, Irana Francisca Catharina. On segregation in bidisperse granular flows.

Degree: 2019, University of Twente

Every year, thousands of people die due to landslides, avalanches and other natural disasters in which separate particles play an important role. For accurate zonation and risk assessment, efficient models are needed that not only take into account the basal topo-graphy, but also the properties of these particles (snow, rock, sand, etc.), such as size- and shape-distribution. The conglomoration of particles is called a granular material, and the flow of a granular material is a granular flow. When a granular material is composed of multiple components that differ in e.g. size, density or shape, the mixture usually segregates into separate phases when sheared or shaken. For example in a size-bidisperse flow over an inclined plane, which contains large and small particles, the larger particles tend to the free surface, while the small particles tend to the base. Both the cause of segregation and the phenomenological aspects are active areas of research. This thesis looks at the latter; it aims to develop efficient and accurate models of granular flows, in particular of bidisperse granular flows, which consist of two types of particles. This thesis starts with developing an efficient model monodisperse granular flows through a contraction, which is validated with a more complex model. This is followed by a model for size-bidisperse flows over an uniform channel, which shows the bulbous head as emergent segregation structure. Then a new technique for mapping discrete particle data to continuum fields is presented, and finally the segregation behaviour of shape-bidisperse particles with different elongations is studied. Advisors/Committee Members: Thornton, Anthony Richard, Weinhart, Thomas.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Denissen, I. F. C. (2019). On segregation in bidisperse granular flows. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/on-segregation-in-bidisperse-granular-flows(84cb3083-4e45-47ba-bac5-cc51880e8601).html ; urn:nbn:nl:ui:28-84cb3083-4e45-47ba-bac5-cc51880e8601 ; 84cb3083-4e45-47ba-bac5-cc51880e8601 ; 10.3990/1.9789036548762 ; urn:isbn:978-90-365-4876-2 ; urn:isbn:978-90-365-4876-2 ; urn:nbn:nl:ui:28-84cb3083-4e45-47ba-bac5-cc51880e8601 ; https://research.utwente.nl/en/publications/on-segregation-in-bidisperse-granular-flows(84cb3083-4e45-47ba-bac5-cc51880e8601).html

Chicago Manual of Style (16th Edition):

Denissen, Irana Francisca Catharina. “On segregation in bidisperse granular flows.” 2019. Doctoral Dissertation, University of Twente. Accessed October 31, 2020. https://research.utwente.nl/en/publications/on-segregation-in-bidisperse-granular-flows(84cb3083-4e45-47ba-bac5-cc51880e8601).html ; urn:nbn:nl:ui:28-84cb3083-4e45-47ba-bac5-cc51880e8601 ; 84cb3083-4e45-47ba-bac5-cc51880e8601 ; 10.3990/1.9789036548762 ; urn:isbn:978-90-365-4876-2 ; urn:isbn:978-90-365-4876-2 ; urn:nbn:nl:ui:28-84cb3083-4e45-47ba-bac5-cc51880e8601 ; https://research.utwente.nl/en/publications/on-segregation-in-bidisperse-granular-flows(84cb3083-4e45-47ba-bac5-cc51880e8601).html.

MLA Handbook (7th Edition):

Denissen, Irana Francisca Catharina. “On segregation in bidisperse granular flows.” 2019. Web. 31 Oct 2020.

Vancouver:

Denissen IFC. On segregation in bidisperse granular flows. [Internet] [Doctoral dissertation]. University of Twente; 2019. [cited 2020 Oct 31]. Available from: https://research.utwente.nl/en/publications/on-segregation-in-bidisperse-granular-flows(84cb3083-4e45-47ba-bac5-cc51880e8601).html ; urn:nbn:nl:ui:28-84cb3083-4e45-47ba-bac5-cc51880e8601 ; 84cb3083-4e45-47ba-bac5-cc51880e8601 ; 10.3990/1.9789036548762 ; urn:isbn:978-90-365-4876-2 ; urn:isbn:978-90-365-4876-2 ; urn:nbn:nl:ui:28-84cb3083-4e45-47ba-bac5-cc51880e8601 ; https://research.utwente.nl/en/publications/on-segregation-in-bidisperse-granular-flows(84cb3083-4e45-47ba-bac5-cc51880e8601).html.

Council of Science Editors:

Denissen IFC. On segregation in bidisperse granular flows. [Doctoral Dissertation]. University of Twente; 2019. Available from: https://research.utwente.nl/en/publications/on-segregation-in-bidisperse-granular-flows(84cb3083-4e45-47ba-bac5-cc51880e8601).html ; urn:nbn:nl:ui:28-84cb3083-4e45-47ba-bac5-cc51880e8601 ; 84cb3083-4e45-47ba-bac5-cc51880e8601 ; 10.3990/1.9789036548762 ; urn:isbn:978-90-365-4876-2 ; urn:isbn:978-90-365-4876-2 ; urn:nbn:nl:ui:28-84cb3083-4e45-47ba-bac5-cc51880e8601 ; https://research.utwente.nl/en/publications/on-segregation-in-bidisperse-granular-flows(84cb3083-4e45-47ba-bac5-cc51880e8601).html

2. van Schrojenstein Lantman, Marnix Pieter. A study on fundamental segregation mechanisms in dense granular flows.

Degree: 2019, University of Twente

Segregation in dense granuar flows occurs due to particles having different properties, with particle size and density playing a dominant role among others such as shape and surface roughness. A good understanding of segregation of realistic materials is required to avoid costly unnecessarily long or re-mixing operations in industrial plants and to predict the evolution of natural hazards like avalanches and pyroclastic flows. Segregation in sheared granular flows is normally described in terms of kinetic sieving, where the larger particles act as a sieve for smaller particles, and squeeze expulsion, where larger particles are squeezed out of their layer in the opposite direction of the smaller particles. The aim of this research is to better understand the micro-mechanical origins of segregation by numerical simulations and to develop models that can qualitatively predict segregation. The considered system is a monodisperse flow with a single large intruder, effectively removing kinetic sieving, but keeping squeeze expulsion. The segregation mechanism is visualised by analysing how the intruder size, density and friction affects the granular flow. This is done by converting the discrete particle simulation data into smooth conservative continuum (density, velocity, stress) fields with a technique called coarse graining. These fields show that a large intruder does not fit inside a layer of bulk particles leading to an anisotropic stress field. This observation has inspired new scalings for the lift force on an intruder, proportional to the shear rate and viscosity gradient of the bulk flow. Simulations for many different flows have been performed to confirm this hypothesis. The fundamental mechanisms discovered in this thesis have improved the understanding of individual particles in granular flows, which can be used to develop more accurate continuum models for segregation. The developed micro-based force model can be used as starting point to develop more sophisticated models that could aid in the engineering of granular materials by balancing size with density and other realistic particle properties with the goal of reducing segregation. Advisors/Committee Members: Thornton, Anthony Richard, Luding, Stefan.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

van Schrojenstein Lantman, M. P. (2019). A study on fundamental segregation mechanisms in dense granular flows. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/a-study-on-fundamental-segregation-mechanisms-in-dense-granular-flows(d85c0937-c067-4ea8-ae28-6f8917d8dfcd).html ; urn:nbn:nl:ui:28-d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; 10.3990/1.9789036547628 ; urn:isbn:978-90-365-4762-8 ; urn:nbn:nl:ui:28-d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; https://research.utwente.nl/en/publications/a-study-on-fundamental-segregation-mechanisms-in-dense-granular-flows(d85c0937-c067-4ea8-ae28-6f8917d8dfcd).html

Chicago Manual of Style (16th Edition):

van Schrojenstein Lantman, Marnix Pieter. “A study on fundamental segregation mechanisms in dense granular flows.” 2019. Doctoral Dissertation, University of Twente. Accessed October 31, 2020. https://research.utwente.nl/en/publications/a-study-on-fundamental-segregation-mechanisms-in-dense-granular-flows(d85c0937-c067-4ea8-ae28-6f8917d8dfcd).html ; urn:nbn:nl:ui:28-d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; 10.3990/1.9789036547628 ; urn:isbn:978-90-365-4762-8 ; urn:nbn:nl:ui:28-d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; https://research.utwente.nl/en/publications/a-study-on-fundamental-segregation-mechanisms-in-dense-granular-flows(d85c0937-c067-4ea8-ae28-6f8917d8dfcd).html.

MLA Handbook (7th Edition):

van Schrojenstein Lantman, Marnix Pieter. “A study on fundamental segregation mechanisms in dense granular flows.” 2019. Web. 31 Oct 2020.

Vancouver:

van Schrojenstein Lantman MP. A study on fundamental segregation mechanisms in dense granular flows. [Internet] [Doctoral dissertation]. University of Twente; 2019. [cited 2020 Oct 31]. Available from: https://research.utwente.nl/en/publications/a-study-on-fundamental-segregation-mechanisms-in-dense-granular-flows(d85c0937-c067-4ea8-ae28-6f8917d8dfcd).html ; urn:nbn:nl:ui:28-d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; 10.3990/1.9789036547628 ; urn:isbn:978-90-365-4762-8 ; urn:nbn:nl:ui:28-d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; https://research.utwente.nl/en/publications/a-study-on-fundamental-segregation-mechanisms-in-dense-granular-flows(d85c0937-c067-4ea8-ae28-6f8917d8dfcd).html.

Council of Science Editors:

van Schrojenstein Lantman MP. A study on fundamental segregation mechanisms in dense granular flows. [Doctoral Dissertation]. University of Twente; 2019. Available from: https://research.utwente.nl/en/publications/a-study-on-fundamental-segregation-mechanisms-in-dense-granular-flows(d85c0937-c067-4ea8-ae28-6f8917d8dfcd).html ; urn:nbn:nl:ui:28-d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; 10.3990/1.9789036547628 ; urn:isbn:978-90-365-4762-8 ; urn:nbn:nl:ui:28-d85c0937-c067-4ea8-ae28-6f8917d8dfcd ; https://research.utwente.nl/en/publications/a-study-on-fundamental-segregation-mechanisms-in-dense-granular-flows(d85c0937-c067-4ea8-ae28-6f8917d8dfcd).html

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