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Rietema Hydrocyclone

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Computer simulation of a Rietema-family hydrocyclone used ...

A 50 mm Rietema-family hydrocyclone is simulated using CFD. The turbulent flow inside the hydrocyclone is modelled using the Reynolds Stress Model, and a Eulerian approach is employed to model the multiphase flow. Numeric validation is performed by comparing the results of the simulation with data found in the literature.

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Computer simulation of a Rietema-family hydrocyclone used ...

A 50 mm Rietema-family hydrocyclone is simulated using CFD. The turbulent flow inside the hydrocyclone is modelled using the Reynolds Stress Model, and a Eulerian approach is employed to model the multiphase flow. Numeric validation is performed by comparing the results of the simulation with data found in the literature. The global

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Performance of a hydrocyclone of "Rietema" geometry as pre ...

The hydrocyclones are equipments widely used by the Industry in cases involving solid-liquid separation, but still little reported in Brazilian irrigated agriculture. The proposal of this research was to evaluate the performance of a hydrocyclone as a pre-filter of aqueous suspensions with sand and soil. This equipment has a diameter of 19.20 cm at the cylindrical part and operates with flow...

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(PDF) A simple procedure for design and performance ...

(4) and (5). These Figures show, for Bradley and Rietema hydrocyclones respectively, the reduced cut size as a function of flow rate, for some values of pressure drop and cyclone diameter. It can be observed that for the same pressure drop Rietema hydrocyclones produce flow rates 2 to 3 times higher than Bradley hydrocyclones of the same size.

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SIMULATION OF TURBULENT FLOW IN A RIETEMA HYDROCYCLONE

simulation turbulent flow rietema hydrocyclone numerical result time-dependent navier-stokes equation abstract large-eddy simulation air core water-fed hydrocyclone main feature dynamic behavior staggered grid smagorinsky subgrid-scale model turbulence effect agree well fractional step method

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Simple procedure for design and performance prediction of ...

In this work, objective was to evaluate the capacity of a Rietema kind of hydrocyclone, with 50 mm diameter, to retain suspended sand in irrigation water. The hydrocyclone was operated with ...

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PERFORMANCE ANALYSIS AND DESIGN OF FILTERING

Rietema’s filtering hydrocyclones had a lower volumetric feed flowrate than the conventional device and Bradley’s filtering hydrocyclones showed increases in this same variable. In both designs, overall efficiency was influenced by the underflow-to-throughput ratio. Keywords: Filtering hydrocyclone; Solid-liquid separation; Hydrocyclone.

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(PDF) Exploration of hydrocyclone designs using ...

Thus, in the design of hydrocyclone, the two by-pass mechanisms must be minimized to realize higher performance efficiencies.In a hydrocyclone, the cylindrical part gives some residence time for the particles to experience centrifugal force, so that coarse particles can migrate toward the wall. ... (Rietema, 1961).Computational fluid dynamics ...

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Bradley Hydrocyclones: Design and Performance Analysis ...

Hydrocyclones are an important class of solid/liquid separation equipments. In this work, three Bradley hydrocyclones with 15,30 and 60 mm diameters were used. Aqueous suspensions of calcium carbonate, with volumetric concentration ranging from 0% to 10% were tested.

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Solid/liquid separation performance of hydrocyclones with ...

hydrocyclones with different cone combinations, also the effect of hydrocyclone cone combinations on the separation performance will be experimentally studied. 2. Simulation parts Three hydrocyclones with diameter of 100mm were designed in this study. The hydrocyclone geometry is

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Computer simulation of a Rietema-family hydrocyclone used ...

A 50 mm Rietema-family hydrocyclone is simulated using CFD. The turbulent flow inside the hydrocyclone is modelled using the Reynolds Stress Model, and a Eulerian approach is employed to model the multiphase flow. Numeric validation is performed by comparing the results of the simulation with data found in the literature. The global

Read More

Performance of a hydrocyclone of "Rietema" geometry as pre ...

The hydrocyclones are equipments widely used by the Industry in cases involving solid-liquid separation, but still little reported in Brazilian irrigated agriculture. The proposal of this research was to evaluate the performance of a hydrocyclone as a pre-filter of aqueous suspensions with sand and soil. This equipment has a diameter of 19.20 cm at the cylindrical part and operates with flow...

Read More

SIMULATION OF TURBULENT FLOW IN A RIETEMA HYDROCYCLONE

simulation turbulent flow rietema hydrocyclone numerical result time-dependent navier-stokes equation abstract large-eddy simulation air core water-fed hydrocyclone main feature dynamic behavior staggered grid smagorinsky subgrid-scale model turbulence effect agree well fractional step method

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Efficiency of a hydrocyclone of "rietema" geometry for pre ...

The hydrocyclone is an equipment widely used by industry in cases involving solid-liquid separation, but still little used in irrigated agriculture in Brazil. This study evaluated the performance of this equipment as a pre-filter of solid particles, from erosive processes and the silting of water resources. The tests were performed with a hydrocyclone of "Rietema" geometry, with a diameter of...

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Performance analysis and design of filtering hydrocyclones ...

Rietema's filtering hydrocyclones had a lower volumetric feed flowrate than the conventional device and Bradley's filtering hydrocyclones showed increases in this same variable. In both designs, overall efficiency was influenced by the underflow-to-throughput ratio.

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Deoiling Hydrocyclones And Their Performance Prediction ...

Nov 12, 2015 · D i = inlet diameter at hydrocyclone inlet, m V i = Fluid velocity at inlet, m/s μ c = viscosity of the continuous phase (water), kg/m-s Rietema Equation: d 50 = 0.51*D cycl *[ρ c / ((Re i)^1.375* Δρ)]^0.5 where: d 50 = droplet size diameter as defined above, m D cycl = Diameter of the cylindrical hydrocyclone chamber, m

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Investigation of the Influence of Hydrocyclone Geometric ...

The hydrocyclone of the base model is composed of an inlet pipe of a 255 mm diameter which makes a volute on the cylinder of the cyclone.The cyclone cylinder has a diameter of 800 mm and a length of 800 mm. It has a cone of 500 mm length and a cone angle of 20 degrees.

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(PDF) Exploration of hydrocyclone designs using ...

Thus, in the design of hydrocyclone, the two by-pass mechanisms must be minimized to realize higher performance efficiencies.In a hydrocyclone, the cylindrical part gives some residence time for the particles to experience centrifugal force, so that coarse particles can migrate toward the wall. ... (Rietema, 1961).Computational fluid dynamics ...

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OPTIMIZING THE HYDROCYCLONE FOR BALLAST WATER

2. Hydrocyclones At present many treatment mechanisms are currently under development for onboard ship use in an attempt to prevent the transfer of unwanted organisms around the world. There are only two commercially available BWT systems at present, one of which utilises a hydrocyclone in conjunction with UV radiation

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Prétraitements – Hydrocyclone - Degremont®

hydrocyclones simples monotubulaires Leurs diamètres varient de 150 à 800 mm pour traiter des débits de 20 à 250 m 3 · h –1 avec des d 50 sur du sable de 50 à 80 mm. Ils sont protégés contre l’abrasion et peuvent être mis en œuvre sur des suspensions peu concentrées de boues, sinon leur pouvoir de coupure augmente rapidement ...

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Pretreatments - Hydrocyclone - Degremont®

monotubular hydrocyclones. Their diameters range from 150 to 800 mm for processing throughputs of 20 to 250 m 3 · h –1 with d50 values for grit of between 50 and 80 mm. They are protected against abrasion and can be used with lightly concentrated sludge suspensions, otherwise their removal capacity rises rapidly (see effect of h).

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Differences of Behavior between Filtering Hydrocyclones ...

The Rietema's filtering hydrocyclones supplied smaller volumetric feed flowrate in relation to the conventional device, the Bradley's filtering hydrocyclones presented increments for this same variable. In both geometry, the overall efficiencies were influenced by the underflow-to-throughput ratio.

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Effects of Solids Concentration and Underflow Diameter on ...

Jul 13, 2017 · Compared to the conventional Rietema hydrocyclone, it shows higher efficiency and better thickening power. The effects of solids concentration and underflow diameter on the performance of the OTH are quantified and a design equation for this device is proposed. Citing Literature.

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Hydrocyclone - Wikipedia

A hydrocyclone (often referred to by the shortened form cyclone) is a device to classify, separate or sort particles in a liquid suspension based on the ratio of their centripetal force to fluid resistance.This ratio is high for dense (where separation by density is required) and coarse (where separation by size is required) particles, and low for light and fine particles.

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Deoiling Hydrocyclones And Their Performance Prediction ...

Nov 12, 2015 · D i = inlet diameter at hydrocyclone inlet, m V i = Fluid velocity at inlet, m/s μ c = viscosity of the continuous phase (water), kg/m-s Rietema Equation: d 50 = 0.51*D cycl *[ρ c / ((Re i)^1.375* Δρ)]^0.5 where: d 50 = droplet size diameter as defined above, m D cycl = Diameter of the cylindrical hydrocyclone chamber, m

Read More

SIMULATION OF TURBULENT FLOW IN A RIETEMA HYDROCYCLONE

simulation turbulent flow rietema hydrocyclone numerical result time-dependent navier-stokes equation abstract large-eddy simulation air core water-fed hydrocyclone main feature dynamic behavior staggered grid smagorinsky subgrid-scale model turbulence effect agree well fractional step method

Read More

Performance analysis and design of filtering hydrocyclones ...

Rietema's filtering hydrocyclones had a lower volumetric feed flowrate than the conventional device and Bradley's filtering hydrocyclones showed increases in this same variable. In both designs, overall efficiency was influenced by the underflow-to-throughput ratio.

Read More

Efficiency of a hydrocyclone of "rietema" geometry for pre ...

The hydrocyclone is an equipment widely used by industry in cases involving solid-liquid separation, but still little used in irrigated agriculture in Brazil. This study evaluated the performance of this equipment as a pre-filter of solid particles, from erosive processes and the silting of water resources. The tests were performed with a hydrocyclone of "Rietema" geometry, with a diameter of...

Read More

Computer simulation of a Rietema-family hydrocyclone used ...

A 50 mm Rietema-family hydrocyclone is simulated using CFD. The turbulent flow inside the hydrocyclone is modelled using the Reynolds Stress Model, and a Eulerian approach is employed to model the multiphase flow. Numeric validation is performed by comparing the results of the simulation with data found in the literature.

Read More

PRELIMINARY RESULTS OF LARGE EDDY SIMULATIONS OF A ...

Rietema hydrocyclone, whose dimensions are shown in Fig. 1 and Table 1, operating without an air core. Figure 1. Schematics of a conventional hydrocyclone (Massarani, 1997). Table 1. Dimensions of the hydrocyclone investigated. MATHEMATICAL MODEL Since Large Eddy Simulations are inherently three-dimensional and time-dependent,

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Effects of Solids Concentration and Underflow Diameter on ...

Jul 13, 2017 · Compared to the conventional Rietema hydrocyclone, it shows higher efficiency and better thickening power. The effects of solids concentration and underflow diameter on the performance of the OTH are quantified and a design equation for this device is proposed. Citing Literature.

Read More

CFD Study on the Effect of Hydrocyclone Structure on the ...

Comparing the simulated results, the hydrocyclone used in the experiments of this study exhibits a higher separation sharpness than the Rietema type and a higher efficiency than the Bradley type based on the same operation capacity and hydrocyclone size.

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Water Temperature's Effect on Hydrocyclone Efficiency | AIChE

I want to share a little about my first academic project, which was entitled “The effect of water temperature on the efficiency of a Rietema hydrocyclone.” This project was realized as a requirement of the course syllabus, namely the “interdisciplinary project,” which is an opportunity for students to conduct academic projects.

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Eficiência de um hidrociclone de geometria "rietema" para ...

The tests were performed with a hydrocyclone of "Rietema" geometry, with a diameter of 19.2 cm at the cylindrical part operating with outflows ranging between 10 m³ h-1 and 27 m³ h-1. The materials used in particulate suspension were clay loam soil and sand from river. The results showed that the average maximum head loss was 52 kPa and 47 ...

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DESEMPENHO DE UM HIDROCICLONE DE GEOMETRIA

performance of a hydrocyclone of geometry “Rietema” as a pre-filter of solid particles. The tests were performed in the Centro Federal de Educação Tenológica de Uberaba - MG - Brazil using a hydrocyclone of Rietema geometry. This equipment has a diameter of 19.20 cm at the cylindrical part and operates with flows ranging between 10 m 3 h-1

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Water Filtration using Hydrocyclone Filter

Rietema’s filtering hydrocyclones had a lower volumetric feed flowrate than the conventional device and Bradley’s filtering hydrocyclones showed increases in this same variable. In both designs, overall efficiency was influenced by the underflow-to-throughput ratio.

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factors affecting the performance of hydrocyclones

The experimental results obtained with the filtering hydrocyclones under the same operational conditions as those for the corresponding conventional devices allow the following conclusions to be drawn. The performance of the hydrocyclones of Bradley s and Rietema s designs is significantly influenced by the filtering medium. Get Price

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HYDROCYCLONE OPTIMIZATION FOR THE REMOVAL OF

The geometric proportions of the hydrocyclone are designed according to Rietema (1961). The separation efficiency is determined on a gravimetrical basis by measuring the particle mass in the feed, underflow and overflow of the hydrocyclone. Additionally, velocity profiles in the hydrocyclone are investigated with 2D/2C-

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