scholarly journals Cell Patterning Method on a Clinically Ubiquitous Culture Dish Using Acoustic Pressure Generated From Resonance Vibration of a Disk-Shaped Ultrasonic Transducer

2019 ◽  
Vol 66 (1) ◽  
pp. 111-118 ◽  
Author(s):  
Chikahiro Imashiro ◽  
Yuta Kurashina ◽  
Taiki Kuribara ◽  
Makoto Hirano ◽  
Kiichiro Totani ◽  
...  
Keyword(s):  
Acoustic Pressure ◽  
Ultrasonic Transducer ◽  
Cell Patterning ◽  
Resonance Vibration ◽  
Culture Dish

scholarly journals Cell Patterning Method Using Resonance Vibration of a Metallic Cell Cultivation Substrate

2016 ◽  
Vol 5 (0) ◽  
pp. 142-148 ◽  
Author(s):  
Chikahiro Imashiro ◽  
Yuta Kurashina ◽  
Kenjiro Takemura
Keyword(s):  
Cell Patterning ◽  
Resonance Vibration ◽  
Cell Cultivation ◽  
Cultivation Substrate ◽  
Metallic Cell

Simulation and Experiment Researches on Acoustic Field of Spherical Shell Focused Ultrasonic Transducer

2013 ◽  
Vol 770 ◽  
pp. 281-284
Author(s):  
Zhen Yin ◽  
Hua Li ◽  
Zi Yang Cao ◽  
Yu Can Fu
Keyword(s):  
Spherical Shell ◽  
Acoustic Field ◽  
Acoustic Pressure ◽  
Ultrasonic Transducer ◽  
Pressure Curve ◽  
Bending Vibration ◽  
Element Simulation ◽  
Ultrasonic Technology ◽  
Simulation And Experiment ◽  
Simulation Results

Aiming at the deficiency of existing focused ultrasonic technology, a new high-power Spherical Shell Focused Ultrasonic Transducer (SSFUT) was designed. The SSFUT is composed of a sandwich piezoelectric ultrasonic transducer and a bending vibration spherical shell. Simulation on acoustic field of SSFUT was carried out. the acoustic field pressure distribution nephogram and the axial acoustic pressure curve of the SSFUT were obtained. The consistency of finite element simulation results and experimental results was verified by testing. The research provides a theoretical basis for implementation and application of the new focused ultrasonic technology.

scholarly journals 3D steerable, acoustically powered microswimmers for single-particle manipulation

2019 ◽  
Vol 5 (10) ◽  
pp. eaax3084 ◽  
Author(s):  
Liqiang Ren ◽  
Nitesh Nama ◽  
Jeffrey M. McNeill ◽  
Fernando Soto ◽  
Zhifei Yan ◽  
...  
Keyword(s):  
Mammalian Cells ◽  
Chemical Engineering ◽  
Acoustic Pressure ◽  
Ultrasonic Transducer ◽  
Acoustic Streaming ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Propulsive Force ◽  
Particle Manipulation ◽  
Bjerknes Force

The ability to precisely maneuver micro/nano objects in fluids in a contactless, biocompatible manner can enable innovative technologies and may have far-reaching impact in fields such as biology, chemical engineering, and nanotechnology. Here, we report a design for acoustically powered bubble-based microswimmers that are capable of autonomous motion in three dimensions and selectively transporting individual synthetic colloids and mammalian cells in a crowded group without labeling, surface modification, or effect on nearby objects. In contrast to previously reported microswimmers, their motion does not require operation at acoustic pressure nodes, enabling propulsion at low power and far from an ultrasonic transducer. In a megahertz acoustic field, the microswimmers are subject to two predominant forces: the secondary Bjerknes force and a locally generated acoustic streaming propulsive force. The combination of these two forces enables the microswimmers to independently swim on three dimensional boundaries or in free space under magnetical steering.

Experimental and Numerical Study on the Melting Acceleration of Phase Change Material by Ultrasonic Vibrations

2006 ◽  
Vol 324-325 ◽  
pp. 1075-1078 ◽  
Author(s):  
Yool Kwon Oh ◽  
Ho Dong Yang
Keyword(s):  
Heat Transfer ◽  
Phase Change ◽  
Phase Change Material ◽  
Acoustic Pressure ◽  
Numerical Study ◽  
Ultrasonic Transducer ◽  
Acoustic Streaming ◽  
Melting Time ◽  
Ultrasonic Vibrations ◽  
Change Material

The present study was investigated on the melting phenomena and the accelerative factors of phase change material (PCM) by acoustic streaming induced ultrasonic vibrations. To investigate the melting phenomena and accelerative factors, the experimental study was measured the liquid temperature and melting time of PCM and was observed the velocity vectors and thermal fluid flow induced acoustic streaming to investigate the heat transfer using particle image velocimetry (PIV) and infrared thermo vision camera, respectively. Also, the numerical study based on a coupled finite element-boundary element method (Coupled FE-BEM) was performed to investigate the analysis of pressure field in the PCM. The results of experimental works revealed that acoustic streaming observed by PIV and infrared thermo vision camera is one of the prime effects accelerating phase change heat transfer. And, the final temperature of PCM is lower and melting speed is 2.6 times faster than that without ultrasonic vibrations when ultrasonic vibrations are applied. The results of numerical work presented that acoustic pressure is higher near the ultrasonic transducer than other points where no ultrasonic transducer was installed and develops more intensive flow such as acoustic streaming, destroying the flow instability. Moreover, the profile of acoustic pressure variation is consistent with that of enhancement of heat transfer.

scholarly journals Modelling pressure distribution in sonicated ethanol solution using COMSOL simulation

2019 ◽  
Vol 90 ◽  
pp. 02003
Author(s):  
Nur Amira Hasnul Hadi ◽  
Arshad Ahmad ◽  
Olagoke Oladokun
Keyword(s):  
Pressure Distribution ◽  
Acoustic Pressure ◽  
Wave Attenuation ◽  
Ultrasonic Transducer ◽  
Ethanol Solution ◽  
Ultrasonic Waves ◽  
Comsol Multiphysics ◽  
Destructive Interference ◽  
Ultrasound Application ◽  
Comsol Simulation

Ultrasound application has been reported to assist chemical processes as a result of various physiochemical effects during acoustic cavitation phenomena in a liquid. In this study, acoustic pressure distribution in ethanol solution induced by ultrasonic waves in a sonoreactor was investigated using COMSOL Multiphysics software. The variations of acoustic pressure distribution in ethanol liquid were investigated through a single-phase incompressible model developed by varying the frequency of an ultrasonic transducer. The simulation in COMSOL Multiphysics shows that the acoustic wave emitted from the bottom of the sonoreactor generated multiple layers of high acoustic pressure distribution. The fluctuating pressure magnitude along the sonoreactor shows that constructive interference produced high acoustic pressure region whereas destructive interference resulted in low acoustic pressure. Meanwhile, the distance over sound wave can travel before attenuation occurs is much further at 60 kHz. These results support the theory that wave attenuation is strongly frequency dependent.

Anti-resonance Vibration Suppression Control in Full-closed Control System

2019 ◽  
Vol 139 (10) ◽  
pp. 847-853
Author(s):  
Yasufumi Yoshiura ◽  
Yusuke Asai ◽  
Yasuhiko Kaku
Keyword(s):  
Control System ◽  
Vibration Suppression ◽  
Resonance Vibration
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