### 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.

Language | English (US) |
---|---|

Pages | 41-53 |

Number of pages | 13 |

Journal | Separation and Purification Technology |

Volume | 185 |

DOIs | |

State | Published - Sep 12 2017 |

### Profile

### Keywords

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

### ASJC Scopus subject areas

- Analytical Chemistry
- Filtration and Separation

### Cite this

**Hydrodynamics within flooded hydrocyclones during excursion in the feed rate : Understanding of turndown ratio.** / Motin, Abdul; Tarabara, Volodymyr V.; Petty, Charles A.; Bénard, André.

Research output: Research - peer-review › Article

}

TY - JOUR

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

UR - http://www.scopus.com/inward/record.url?scp=85019854991&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85019854991&partnerID=8YFLogxK

U2 - 10.1016/j.seppur.2017.05.015

DO - 10.1016/j.seppur.2017.05.015

M3 - Article

VL - 185

SP - 41

EP - 53

JO - Separation and Purification Technology

JF - Separation and Purification Technology

SN - 1383-5866

ER -