2 centifugal filtration

Dynamic Environment

For

Centrifugal Filtration

CONFIDENTIAL

© Copyright 2013, All Rights Reserved, Hanif A. Bholat, Melvin W. Cook

by

Hanif A. Bholat, Melvin W. Cook

CONFIDENTIAL


Elements of Centrifugal Filtration

Radial Force

Parallel to

Face of Filter

Optimum Filter Position*

*David S. Lycon, Ph.D. ThesisUniv. of Victoria, B.C. 1999

Slide 2

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Elements of Centrifugal FiltrationInfluent/Concentrate Channel

Influent Flow

Parallel to

Radial Force

Slide 3

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Elements of Centrifugal FiltrationGradients During Centrifugation

Slide 4

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Elements of Centrifugal FiltrationCoriolis, Centrifugal, and Euler Effects

Slide 5

Only in a Centrifuge

Significant Reduction

In Caking DensitySustained Flux

Unit Volume,

Unit Filter Surface Area,

Unit Flux


Surface Area/Volume Ratio: 1

Coriolis Acceleration = 2ωv

Envisioned Laminar Layer

Slide 6

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Reduced Volume,

Reduced Filter Surface Area,

Reduced Flux



Coriolis Acceleration = 2ωv


Slide 7

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Concentrate

Out of Centrifuge


Slide 8

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Elements of Centrifugal FiltrationCentrifuge in Operation

Alleviate Filter Caking

Enhance Flux

Reduce Energy per Unit Flux

Coriolis, Centrifugal, and Euler Effects

Only in a CentrifugeSlide 9

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Slide 10

To Increase Efficiency

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1/10 Unit Volume,

Unit Filter Surface Area,

Unit Flux


Coriolis Acceleration = 2ω10 v

Slide 11

Increase Coriolis Acceleration

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Reduced Volume,

Reduced Filter Surface Area,

Reduced Flux

To Increase Acceleration

Slide 12


Coriolis Acceleration = 2ω10 v

Concentrate

Out of Centrifuge


Additional Alleviation in Filter Caking

Additional Enhancement in Flux

Additional Reduction in Energy per Unit Flux

Effects of Increased Coriolis Acceleration

Slide 13

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Coriolis, Centrifugal, and Euler Forces

The Blue Curve represents the action of a non-permeable particle moving away from the filter.

The Black Arrows represent the Coriolis Force, which acts perpendicular to the path of the particle

represented by the Blue Curve.

The Green Arrows represent the Centrifugal Force, whose line of action passes through the center

of rotation.

The Orange Arrows represent the Euler Force, which acts in the circumferential direction, and is

perpendicular to the Centrifugal Force.

Flux

Only in a Centrifuge

Slide 14

Fc = mω2/r

Ac = 2ωv Ef = ωv

Face of Filter

Parallel to Radial Force

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Proof of Concept Design

Slide 15

Filter Assembly

Influent

Clockwise Rotation

Top View – Cross SectionScale 2 :1

Filtrate Channel

Influent/Concentrate Channel

Filtrate

Conc

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Centrifugal Reverse Osmosis

Slide 16

(With RO Cartridges)

Clockwise Rotation

David S. Lycon, Ph.D. Thesis

Univ. of Victoria, B.C. 1999

7% Reduction in Flux

After 5 Days

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Proof of Concept Design

Slide 17

Filter Assembly

Influent

Clockwise Rotation

Top View – Cross SectionScale 2 :1

Filtrate Channel

Influent/Concentrate Channel

Filtrate

Conc

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CONFIDENTIAL


Only In A CentrifugeCan

Coriolis, Centrifugal, and Euler Forces

Alleviate Filter Caking

Produce A Sustained Flux

Reduce Energy Consumption

2 centifugal filtration

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