Continuous Separation Technique of Suspended Particles by Utilizing Acoustic Radiation and Electrostatic Force

This review focuses on the fabrication methods, theory, and applications of micro free flow electrophoresis (μFFE), a continuous separation technique particularly well suited for microscale purifications and online monitoring applications.

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Simulated Moving Bed Technology: Overview and Use in Biorefineries

10.5772/intechopen.99991 ◽

2021 ◽

Author(s):

Deepak Sharma

Keyword(s):

Production Technology ◽

Raw Material ◽

Separation Technique ◽

Simulated Moving Bed ◽

Industrial Chemicals ◽

Continuous Separation ◽

Moving Bed ◽

Fermentation Processes ◽

Lower Power ◽

Separation Technology

Synthesis of chemical compounds oftentimes produce a mixture of desired and undesired components. The ease of purification and recovery of the desired component more often than not determines the viability of the production technology. Simulated Moving Bed (SMB) technology is a continuous purification and separation technique with better performance (less solvent consumption and higher throughput) than traditional batch chromatography. SMB is a continuous separation technology which can be used to achieve the desired product purity with considerably lower power and raw material consumption. A lot of research and development is undergoing in the SMB technology which is enabling the search for more economical and carbon neutral ways of producing industrial chemicals. SMB has proven to be of great assistance in extracting products produced in biorefinery fermentation processes in an economical and energy efficient fashion. This chapter outlines the various processes the author has developed using SMB technology, its use in biorefineries, and prospective use in the future.

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Studies on Particle Separation by Acoustic Radiation Force and Electrostatic Force

Japanese Journal of Applied Physics ◽

10.1143/jjap.35.3295 ◽

1996 ◽

Vol 35 (Part 1, No. 5B) ◽

pp. 3295-3299 ◽

Cited By ~ 13

Author(s):

Kenji Yasuda ◽

Kazuo Takeda ◽

Shin-ichiro Umemura

Keyword(s):

Acoustic Radiation ◽

Electrostatic Force ◽

Particle Separation ◽

Radiation Force ◽

Acoustic Radiation Force

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Numerical study of acoustophoretic manipulation of particles in microfluidic channels

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1177/09544119211024775 ◽

2021 ◽

pp. 095441192110247

Author(s):

Jun Ma ◽

Dongfang Liang ◽

Xin Yang ◽

Hanlin Wang ◽

Fangda Wu ◽

...

Keyword(s):

Acoustic Waves ◽

Acoustic Radiation ◽

Numerical Study ◽

Surface Acoustic Waves ◽

Radiation Force ◽

Suspended Particles ◽

Bottom Surface ◽

Microfluidic Channels ◽

The Finite Element Method ◽

First Order

The microfluidic technology based on surface acoustic waves (SAW) has been developing rapidly, as it can precisely manipulate fluid flow and particle motion at microscales. We hereby present a numerical study of the transient motion of suspended particles in a microchannel. In conventional studies, only the microchannel’s bottom surface generates SAW and only the final positions of the particles are analyzed. In our study, the microchannel is sandwiched by two identical SAW transducers at both the bottom and top surfaces while the channel’s sidewalls are made of poly-dimethylsiloxane (PDMS). Based on the perturbation theory, the suspended particles are subject to two types of forces, namely the Acoustic Radiation Force (ARF) and the Stokes Drag Force (SDF), which correspond to the first-order acoustic field and the second-order streaming field, respectively. We use the Finite Element Method (FEM) to compute the fluid responses and particle trajectories. Our numerical model is shown to be accurate by verifying against previous experimental and numerical results. We have determined the threshold particle size that divides the SDF-dominated regime and the ARF-dominated regime. By examining the time scale of the particle movement, we provide guidelines on the device design and operation.

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Determination of the parameters of suspended particles using acoustic radiation

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2021-87-5-27-33 ◽

2021 ◽

Vol 87 (5) ◽

pp. 27-33

Author(s):

V. V. Semenov

Keyword(s):

Visual Processing ◽

Acoustic Radiation ◽

Block Diagram ◽

Mass Density ◽

Suspended Particles ◽

Solid Particles ◽

Flow Area ◽

Particle Flows ◽

Sequential Images

The flow of a gas or liquid can be visualized by detecting and analyzing sequential images of the particle distribution on the surface of the object under study through the determination of the motion parameters. However, this approach does not provide estimation of the mass and density of solid particles along with visualization of their distribution. We present the results of determining the mass and density of suspended particles using additional irradiation of the particle flux with acoustic radiation. The technique is based on the use of the method of visual processing of images of particle flows entrained by an acoustic field of a given frequency and amplitude for at least two periods of acoustic vibrations. Relaxation of the particles in the measuring plane «cut out» by the light «knife» was also taken into account. The basic mathematical expressions required for estimation of the mass, density, velocity field and shape of the particles using digital image processing and temperature measurement in the flow area are presented. The block diagram and design of the device used for the implementation of the proposed diagnostic method are presented. This technique can be used to determine the parameters of suspended particles in medicine, biology, ecology, powder metallurgy and other fields of science and technology.

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