Hydrodynamics within flooded hydrocyclones during excursion in the feed rate: Understanding of turndown ratio

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    Abstract

    The underflow purity coefficient of a de-oiling hydrocyclone operating at a fixed split ratio is limited by the existence of a finite turndown ratio during excursion in the feed rate. The purpose of this paper is to use advanced computational fluid dynamic methods to identify a hydrodynamic reason for this phenomenon. The results of the simulation show that as the feed Reynolds number increases beyond a critical value, a redistribution of the angular momentum within the hydrocyclone decreases the distance of the zero axial gradient of radial pressure gradient, (d(dP/dr)/dz)r=0=0, from the vortex finder, which thereby shortens the length of reverse flow core. The breakdown of reverse flow core at a high feed Reynolds number causes a catastrophic drop in the separation efficiency and possesses a finite turndown ratio. This insight offers guidance on how to maintain separation performance during an excursion in the feed rate.

    Original languageEnglish (US)
    Pages (from-to)41-53
    Number of pages13
    JournalSeparation and Purification Technology
    Volume185
    DOIs
    StatePublished - Sep 12 2017

    Profile

    Conjunctival Diseases
    Alphavirus
    Reynolds number
    Hydrodynamics
    Collagen Type XII
    Fusobacterium
    Phenylketonurias
    Angular momentum
    Vortex flow
    Pressure gradient
    Computational fluid dynamics

    Keywords

    • Computational fluid dynamics
    • Hydrocyclone
    • Hydrodynamics
    • Separation
    • Turndown ratio

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Filtration and Separation

    Cite this

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    title = "Hydrodynamics within flooded hydrocyclones during excursion in the feed rate: Understanding of turndown ratio",
    abstract = "The underflow purity coefficient of a de-oiling hydrocyclone operating at a fixed split ratio is limited by the existence of a finite turndown ratio during excursion in the feed rate. The purpose of this paper is to use advanced computational fluid dynamic methods to identify a hydrodynamic reason for this phenomenon. The results of the simulation show that as the feed Reynolds number increases beyond a critical value, a redistribution of the angular momentum within the hydrocyclone decreases the distance of the zero axial gradient of radial pressure gradient, (d(dP/dr)/dz)r=0=0, from the vortex finder, which thereby shortens the length of reverse flow core. The breakdown of reverse flow core at a high feed Reynolds number causes a catastrophic drop in the separation efficiency and possesses a finite turndown ratio. This insight offers guidance on how to maintain separation performance during an excursion in the feed rate.",
    keywords = "Computational fluid dynamics, Hydrocyclone, Hydrodynamics, Separation, Turndown ratio",
    author = "Abdul Motin and Tarabara, {Volodymyr V.} and Petty, {Charles A.} and André Bénard",
    year = "2017",
    month = "9",
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    pages = "41--53",
    journal = "Separation and Purification Technology",
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    publisher = "Elsevier",

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    T1 - Hydrodynamics within flooded hydrocyclones during excursion in the feed rate

    T2 - Separation and Purification Technology

    AU - Motin,Abdul

    AU - Tarabara,Volodymyr V.

    AU - Petty,Charles A.

    AU - Bénard,André

    PY - 2017/9/12

    Y1 - 2017/9/12

    N2 - The underflow purity coefficient of a de-oiling hydrocyclone operating at a fixed split ratio is limited by the existence of a finite turndown ratio during excursion in the feed rate. The purpose of this paper is to use advanced computational fluid dynamic methods to identify a hydrodynamic reason for this phenomenon. The results of the simulation show that as the feed Reynolds number increases beyond a critical value, a redistribution of the angular momentum within the hydrocyclone decreases the distance of the zero axial gradient of radial pressure gradient, (d(dP/dr)/dz)r=0=0, from the vortex finder, which thereby shortens the length of reverse flow core. The breakdown of reverse flow core at a high feed Reynolds number causes a catastrophic drop in the separation efficiency and possesses a finite turndown ratio. This insight offers guidance on how to maintain separation performance during an excursion in the feed rate.

    AB - The underflow purity coefficient of a de-oiling hydrocyclone operating at a fixed split ratio is limited by the existence of a finite turndown ratio during excursion in the feed rate. The purpose of this paper is to use advanced computational fluid dynamic methods to identify a hydrodynamic reason for this phenomenon. The results of the simulation show that as the feed Reynolds number increases beyond a critical value, a redistribution of the angular momentum within the hydrocyclone decreases the distance of the zero axial gradient of radial pressure gradient, (d(dP/dr)/dz)r=0=0, from the vortex finder, which thereby shortens the length of reverse flow core. The breakdown of reverse flow core at a high feed Reynolds number causes a catastrophic drop in the separation efficiency and possesses a finite turndown ratio. This insight offers guidance on how to maintain separation performance during an excursion in the feed rate.

    KW - Computational fluid dynamics

    KW - Hydrocyclone

    KW - Hydrodynamics

    KW - Separation

    KW - Turndown ratio

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