Characterization of the physical parameters in a process of magnetic separation and pressure-driven flow of a magnetic fluid

2004 ◽  
Vol 343 ◽  
pp. 36-64 ◽  
Author(s):  
F.R. Cunha ◽  
Y.D. Sobral
Keyword(s):  
Magnetic Separation ◽  
Magnetic Fluid ◽  
Physical Parameters ◽  
Pressure Driven Flow ◽  
Pressure Driven

Characterization of AC Electrokinetic Forces Using Pressure-Driven Flow in a Microchannel

2008 ◽  
Author(s):  
Jorge J. Capurro ◽  
Hongseok Moses Noh
Keyword(s):  
Glass Plate ◽  
Force Balance ◽  
Ac Electroosmosis ◽  
Ac Electrokinetics ◽  
Quantitative Understanding ◽  
Versatile Technique ◽  
Electrothermal Effects ◽  
Pressure Driven Flow ◽  
Pressure Driven

Ac electrokinetics is a versatile technique for particle and fluid manipulation in microfluidic environment. However, analyzing and predicting particle motions due to the ac electrokinetic effects is a difficult task because it requires the quantitative understanding of multiple phenomena such as dielectrophoresis (DEP), ac electroosmosis (ACEO), and electrothermal effects (ETE). In this paper we present a force balance approach to analyze ac electrokinetic effects, particularly ACEO. Pressure-driven flows were used to quantify the ACEO and DEP forces acting on a particle. Polystyrene microbeads suspended in KCl solution were introduced in polydimethylsiloxane (PDMS) microchannels attached to a glass plate with gold microelectrodes. The microbeads were initially collected and aligned along the center of the electrodes at 1 kHz and 1 Vp-p, and then a well-controlled pressure-driven flow was introduced resulting in the translation of the particles. Particles moved to a new location where a new force balance is reached. This particle translation on the surface of the electrode was carefully monitored as varying the applied flow rate. The net force due to ac electrokinetic effects at different locations over the electrode was calculated using the experimental data and the force balance relationship.

scholarly journals Acoustic Characterization of Some Steel Industry Waste Materials

2021 ◽  
Vol 11 (13) ◽  
pp. 5924
Author(s):  
Elisa Levi ◽  
Simona Sgarbi ◽  
Edoardo Alessio Piana
Keyword(s):  
Thermal Characteristic ◽  
Environmental Benefits ◽  
Acoustic Properties ◽  
Physical Parameters ◽  
Industry Waste ◽  
Acoustic Characterization ◽  
Minimization Procedure ◽  
The Difference ◽  
By Products

From a circular economy perspective, the acoustic characterization of steelwork by-products is a topic worth investigating, especially because little or no literature can be found on this subject. The possibility to reuse and add value to a large amount of this kind of waste material can lead to significant economic and environmental benefits. Once properly analyzed and optimized, these by-products can become a valuable alternative to conventional materials for noise control applications. The main acoustic properties of these materials can be investigated by means of a four-microphone impedance tube. Through an inverse technique, it is then possible to derive some non-acoustic properties of interest, useful to physically characterize the structure of the materials. The inverse method adopted in this paper is founded on the Johnson–Champoux–Allard model and uses a standard minimization procedure based on the difference between the sound absorption coefficients obtained experimentally and predicted by the Johnson–Champoux–Allard model. The results obtained are consistent with other literature data for similar materials. The knowledge of the physical parameters retrieved applying this technique (porosity, airflow resistivity, tortuosity, viscous and thermal characteristic length) is fundamental for the acoustic optimization of the porous materials in the case of future applications.

Preparation and Characterization of Chitosan Pressure-Driven Filtration Membranes

2019 ◽  
Vol 1 (5) ◽  
pp. 306-315 ◽  
Author(s):  
V. M. Sedelkin ◽  
L. N. Potehina ◽  
O. A. Lebedeva ◽  
M. G. Schneider ◽  
E. R. Ulyanova
Keyword(s):  
Filtration Membranes ◽  
Pressure Driven

scholarly journals Molecular dynamics study of pressure-driven water transport through graphene bilayers

2016 ◽  
Vol 18 (3) ◽  
pp. 1886-1896 ◽  
Author(s):  
Bo Liu ◽  
Renbing Wu ◽  
Julia A. Baimova ◽  
Hong Wu ◽  
Adrian Wing-Keung Law ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
High Pressure ◽  
Water Transport ◽  
Layered Structures ◽  
Water Molecules ◽  
Flow Rates ◽  
Ultra High Pressure ◽  
Pressure Driven Flow ◽  
Pressure Driven

Water molecules form layered structures inside graphene bilayers and ultra-high pressure-driven flow rates can be observed.

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