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.

LanguageEnglish (US)
Pages41-53
Number of pages13
JournalSeparation and Purification Technology
Volume185
DOIs
StatePublished - Sep 12 2017

Profile

Reynolds number
Hydrodynamics
Angular momentum
Pressure gradient
Computational fluid dynamics
Vortex flow

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 Andr{\'e} B{\'e}nard",
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T2 - Separation and Purification Technology

AU - Motin,Abdul

AU - Tarabara,Volodymyr V.

AU - Petty,Charles A.

AU - Bénard,André

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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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