On segregation in bidisperse granular flows

Irana Francisca Catharina Denissen

    Research output: ThesisPhD Thesis - Research UT, graduation UT

    25 Downloads (Pure)

    Abstract

    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.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    Supervisors/Advisors
    • Thornton, Anthony Richard, Supervisor
    • Weinhart, Thomas , Co-Supervisor
    Thesis sponsors
    Award date28 Nov 2019
    Place of PublicationEnschede
    Publisher
    Print ISBNs978-90-365-4876-2
    Electronic ISBNs978-90-365-4876-2
    DOIs
    Publication statusPublished - 28 Nov 2019

    Fingerprint

    particle
    avalanche
    natural disaster
    contraction
    zonation
    landslide
    risk assessment
    snow
    sand
    rock
    material
    thesis
    distribution

    Cite this

    Denissen, I. F. C. (2019). On segregation in bidisperse granular flows. Enschede : University of Twente. https://doi.org/10.3990/1.9789036548762
    Denissen, Irana Francisca Catharina. / On segregation in bidisperse granular flows. Enschede : University of Twente, 2019. 140 p.
    @phdthesis{84cb30834e4547babac5cc51880e8601,
    title = "On segregation in bidisperse granular flows",
    abstract = "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.",
    author = "Denissen, {Irana Francisca Catharina}",
    year = "2019",
    month = "11",
    day = "28",
    doi = "10.3990/1.9789036548762",
    language = "English",
    isbn = "978-90-365-4876-2",
    publisher = "University of Twente",
    address = "Netherlands",

    }

    Denissen, IFC 2019, 'On segregation in bidisperse granular flows', Doctor of Philosophy, Enschede . https://doi.org/10.3990/1.9789036548762

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

    Enschede : University of Twente, 2019. 140 p.

    Research output: ThesisPhD Thesis - Research UT, graduation UT

    TY - THES

    T1 - On segregation in bidisperse granular flows

    AU - Denissen, Irana Francisca Catharina

    PY - 2019/11/28

    Y1 - 2019/11/28

    N2 - 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.

    AB - 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.

    U2 - 10.3990/1.9789036548762

    DO - 10.3990/1.9789036548762

    M3 - PhD Thesis - Research UT, graduation UT

    SN - 978-90-365-4876-2

    PB - University of Twente

    CY - Enschede

    ER -

    Denissen IFC. On segregation in bidisperse granular flows. Enschede : University of Twente, 2019. 140 p. https://doi.org/10.3990/1.9789036548762