Numerical study of a particle separation method based on the Segré-Silberberg effect

PAMM ◽  
2014 ◽  
Vol 14 (1) ◽  
pp. 669-670
Author(s):  
Maximilian Fischer ◽  
Peter Ehrhard
Keyword(s):  
Numerical Study ◽  
Particle Separation ◽  
Separation Method

NUMERICAL STUDY OF DIELECTROPHORESIS FORCE IN THE ISOLATED ELECTRODE: A COMPARATIVE APPROACH

2014 ◽  
Vol 26 (05) ◽  
pp. 1450062
Author(s):  
Mazdak Rad Malekshahi ◽  
Karim Ansaroudi ◽  
Hadi Veladi ◽  
Manouchehr Bahrami ◽  
Esmaeil Esmaeilzadeh
Keyword(s):  
Electrical Conductivity ◽  
Electric Field ◽  
Frequency Response ◽  
Dielectric Layer ◽  
Numerical Study ◽  
Particle Separation ◽  
Comparative Approach ◽  
Electrode Arrays ◽  
Pass Filter ◽  
Dielectric Thickness

One of the general methods for particle separation in lab-on-a-chips (LOCs) is dielectrophoresis (DEP). The effects of electrode isolation in DEP-based particle separation devices are discussed throughout this paper. One advantage of the electrode isolation is reducing electrode–electrolyte–sample mutual interactions. In this study, the conventional DEP forces using interdigitated electrode arrays is numerically investigated without and in the presence dielectric layer in the interface of electrode and electrolytic fluid. The study includes the effect of dielectric layer thickness when fluids of different electrical conductivity are involved. The results show that the electric field and also intra-channel gradient of electric field square depend on frequency and an isolating layer acts as high-pass filter, thus frequency response of conventional DEP force besides Clausius–Mossotti (CM) factor is depended on the electric field gradient. The results also show that in contactless model, the frequency response of the DEP forces can be engineered by dielectric thickness and electrical conductivity of the suspending medium. According to the obtained results, during particle separation with DEP method in the presence of insolated electrodes and considering the reduction in electric field intensity, an appropriate and optimal choice for working frequency, voltage of electrodes and thickness of dielectric layer should be considered. The particles and dielectric isolated layer under study is polystyrene beads and polydimethylsiloxane (PDMS) elastomeric polymer, respectively.

Study of the Particle Separation Performance of a Dust-settling Hopper

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Bofu Wu ◽  
Jinlai Men ◽  
Jie Chen
Keyword(s):  
Fluid Dynamics ◽  
Particle Concentration ◽  
Separation Efficiency ◽  
Simulation Analysis ◽  
Numerical Study ◽  
Particle Separation ◽  
Separation Performance ◽  
Particle Removal ◽  
Airflow Velocity ◽  
Calculation Results

This paper presents a numerical study to predict the particle separation performance of a dust-settling hopper using computational fluid dynamics. The Euler-Lagrange approach was employed to analyze the particle separation efficiency and the outflow particle concentration of the dust-settling hopper under different inlet airflow velocities. The calculation results obtained reveal that the overall particle separation efficiency and the outflow particle concentration decrease with the increase of the inlet airflow velocity, and the particle grade efficiency increases with particle size. Since there is a paradox between the particle separation performance and the particle removal performance for a street vacuum sweeper, it is necessary to counter-balance the effects of the inlet airflow velocity on them. According to the simulation analysis, an appropriate inlet airflow velocity is provided for the design of the dust-settling hopper.

Numerical Study on the Influence of Microchannel’s Geometry on Sub-Micron Particles Separation Using Acoustophoresis

2020 ◽  
Author(s):  
Tsz Wai Lai ◽  
Sau Chung Fu ◽  
Ka Chung Chan ◽  
Christopher Yu Hang Chao ◽  
Anthony Kwok Yung Law
Keyword(s):  
Acoustic Radiation ◽  
Numerical Study ◽  
Acoustic Streaming ◽  
Particle Separation ◽  
Radiation Force ◽  
Rectangular Microchannel ◽  
Cross Sectional ◽  
Fluid Medium ◽  
Particle Sorting ◽  
Micron Particle

Abstract Application of acoustophoresis to cell and particle separation in microchannel filled with fluid medium has been drawing increasing attention in many disciplines in the past decades due to its high precision and minimum damage to the matters of interest. Previous studies on particle separation often rely on the size-dependent feature of the acoustic radiation force (ARF), while the acoustic streaming effect (ASE) is a hurdle as the particle size goes down. Sub-micron particles circulate according to the streaming vortices and become inseparable from the particles settled on the pressure node. Instead of suppressing the ASE, this study intends to utilize the combined effect of ARF and ASE on sub-micron particle sorting by altering the microchannel’s cross-sectional shapes. The roles of ARF and ASE on particles with 0.2um and 2um in radius in various cross-sectional shapes are studied numerically. The studied geometries include 1. rectangular, 2. trapezoidal, and 3. triangular. The results show that changing the cross-sectional shapes affects the acoustic field’s magnitude and distribution, the streaming patterns, the magnitude of streaming velocity, and the movement of sub-micron particles. In non-rectangular microchannel, sub-micron particles circulate towards and settle at the center of the streaming vortices. This phenomenon shows the potential to manipulate the streaming-dominant particles, thereby enhancing the acoustophoretic particle sorting performance.

Gravity-driven hydrodynamic particle separation in digital microfluidic systems

RSC Advances ◽  
2015 ◽  
Vol 5 (45) ◽  
pp. 35966-35975 ◽  
Author(s):  
Hojatollah Rezaei Nejad ◽  
Ehsan Samiei ◽  
Ali Ahmadi ◽  
Mina Hoorfar
Keyword(s):  
Particle Separation ◽  
Separation Method ◽  
Electrode Configuration ◽  
Microfluidic Systems ◽  
Gravity Driven ◽  
Digital Microfluidic ◽  
Actuation Scheme

In the present study, the electrode configuration and actuation scheme are designed in a fashion to implement a gravity-based hydrodynamic particle separation method on digital microfluidic systems.

Bidirectional field-flow particle separation method in a dielectrophoretic chip with 3D electrodes

2008 ◽  
Vol 129 (1) ◽  
pp. 491-496 ◽  
Author(s):  
Ciprian Iliescu ◽  
Liming Yu ◽  
Francis E.H. Tay ◽  
Bangtao Chen
Keyword(s):  
Particle Separation ◽  
Separation Method ◽  
3D Electrodes ◽  
Flow Particle
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