Simulation of a Layered Resonator for a Microfluidic Ultrasonic Separator

2006 ◽  
Author(s):  
Yijun Shen ◽  
Mark A. Atherton
Keyword(s):  
Energy Density ◽  
Pressure Distribution ◽  
Standing Wave ◽  
Acoustic Pressure ◽  
Separation Performance ◽  
Experimental Measurements ◽  
Driving Frequency ◽  
Stored Energy ◽  
Acoustic Characteristics ◽  
Small Spherical Particle

This paper focuses on the simulation of a layered resonator for a microfluidic ultrasonic separator with a special emphasis on analysing the stored energy-frequency product in the microfluid chamber. Since the acoustic force acting on a small spherical particle in a standing wave in the cavity of an ultrasonic separator is proportional to the product of the energy density in the standing wave and the driving frequency, the energy-frequency product can be used as a prediction of the separation performance in an ultrasonic separator. The electro-acoustic characteristics of the resonator under different conditions are also investigated. In particular, the influence of the reflector thickness on the stored energy-frequency product of the layered resonator is examined. Furthermore, the acoustic pressure distribution in the fluid chamber of the ultrasonic separator is investigated in detail. Predicted results from simulations compare well with experimental measurements and show that the model can be used to predict the electro-acoustic characteristics and the separation performance.

Calculation of Nano-Sized Particle Catcher by Ultrasonic Vibration

2011 ◽  
Author(s):  
Shinichi Nishino ◽  
Mitsuaki Ochi ◽  
Kenji Kofu
Keyword(s):  
Influenza Virus ◽  
Acoustic Wave ◽  
Pressure Distribution ◽  
Standing Wave ◽  
Ultrasonic Vibration ◽  
Particle Motion ◽  
Acoustic Pressure ◽  
The Other ◽  
Calculation Domain ◽  
Plate Velocity

Particles on the plate vibrated by ultrasonic were gathered on the node of vibration plate. Similar to this phenomenon, if two plates are set with parallel, a plate is vibrated by ultrasonic and acoustic pressure distribution is produced between the vibration and reflection plate, nano-sized particles might be collected from the air flow and air is cleaned. Although ultrasonic was applied for the liquid and remove particles, but this has not been researched for air. Then the purpose of this study is to calculate the acoustic pressure distribution between the vibration and reflection plate by using CFD, and investigate the nano-sized particle motion in acoustic pressure distribution. When standing wave between plates is calculated, acoustic wave generated by ultrasonic vibration was reflected at the reflection plate. In the case of CFD, standing wave could not be calculated because these waves disclaim each other and wave generated by a plate doesn’t reach at the other plate. Therefore acoustic wave is also produced at reflection plate, duplicate these waves from vibration and reflection plates, and standing wave between plates were obtained. About investigation for the nano-sized particle motion in acoustic pressure distribution, particles were injected into calculation domain. Particles which have the same diameter and density with influenza virus were applied in this calculation. Examination of particle’s motion and efficient condition on dust catch were calculated in case of changing parameter, for example, amplitude and frequency of vibration plate, velocity of flowing particles, concentration of particles in the flow and so on.

scholarly journals Experimental and numerical study of acoustic pressure distribution in a sonochemical reactor

2021 ◽  
Vol 1809 (1) ◽  
pp. 012025
Author(s):  
M O Kuchinskiy ◽  
T P Lyubimova ◽  
K A Rybkin ◽  
O O Fattalov ◽  
L S Klimenko
Keyword(s):  
Pressure Distribution ◽  
Acoustic Pressure ◽  
Numerical Study

Relationship between the stored energy density and intensity

1988 ◽  
Vol 84 (S1) ◽  
pp. S148-S148
Author(s):  
G. Maidanik ◽  
J. Dickey
Keyword(s):  
Energy Density ◽  
Stored Energy

A Rapidly Converging Theoretical Solution of the Elastohydrodynamic Problem for Rectangular Rubber Seals

1980 ◽  
Vol 22 (1) ◽  
pp. 9-16 ◽  
Author(s):  
L. E. C. Ruskell
Keyword(s):  
Pressure Distribution ◽  
Theoretical Approach ◽  
Theoretical Solution ◽  
Experimental Measurements ◽  
Rectangular Section ◽  
Rubber Seal

A theoretical approach is described which overcomes the problems of convergence previously associated with obtaining solutions of the elastohydrodynamic equations for a reciprocating, rectangular section rubber seal. Convergence of this method is extremely rapid. Results are presented which illustrate that it is suitable both for instrokes and outstrokes at realistic sealed pressures. Experimental measurements of pressure distribution are presented for comparison.

Application of Numerical and Experimental Techniques for the Aero-Acoustic Characterisation of a Car Rear-View Mirror

2005 ◽  
Vol 4 (1-2) ◽  
pp. 185-212 ◽  
Author(s):  
Christoph Reichl ◽  
Christian Krenn ◽  
Martin Mann ◽  
Hermann Lang
Keyword(s):  
Acoustic Pressure ◽  
Cfd Simulation ◽  
Numerical Study ◽  
Pressure Fluctuations ◽  
Acoustic Analogy ◽  
Acoustic Characteristics ◽  
Rear View Mirror ◽  
Piv Method ◽  
Local Areas ◽  
Experimental Approaches

Numerical as well as experimental approaches are used to capture aero-acoustic characteristics of a car rear-view mirror. The numerical study splits up into several parts. Using an actual production mirror, particular emphasis must be put on the geometry preparation and mesh generation. Initially, a CFD simulation of the entire car aerodynamics is performed to extract the proper flow boundary conditions for the aero-acoustic simulation of a smaller section surrounding the mirror. Pressure fluctuations on the surfaces extracted during an LES generate the data base required for the aeroacoustic post-processing. The acoustic pressure at several monitoring points is then calculated using Lighthill's Acoustic Analogy. To include refraction effects of the nearby surfaces a direct BEM approach is also employed. Utilizing the PIV method, local areas of increased turbulence are identified experimentally. Microphone measurements with and without the exterior mirror are performed.

scholarly journals Distribution of internal stresses and stored energy density within a grain of deformed polycrystal

2012 ◽  
Vol 2 (2) ◽  
pp. 84-89 ◽  
Author(s):  
S. F. Kiseleva ◽  
N. A. Popova ◽  
N. A. Koneva ◽  
E. V. Kozlov
Keyword(s):  
Energy Density ◽  
Internal Stresses ◽  
Stored Energy

Achieving high discharge energy density and efficiency with NBT-based ceramics for application in capacitors

2019 ◽  
Vol 7 (14) ◽  
pp. 4072-4078 ◽  
Author(s):  
Zhongbin Pan ◽  
Di Hu ◽  
Yang Zhang ◽  
Jinjun Liu ◽  
Bo Shen ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
High Efficiency ◽  
Energy Storage Density ◽  
Discharge Energy ◽  
Stored Energy ◽  
High Discharge ◽  
Storage Density ◽  
Recoverable Energy ◽  
Discharge Energy Density

The 0.94(BNT–BST)–0.06KNN ceramic possesses an excellent stored energy storage density (Ws = ∼3.13 J cm−3), a recoverable energy storage density (Wr = ∼2.65 J cm−3), and maintains a relatively high efficiency (η ∼ 84.6%).

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