Observation of Particle Flocculation by kHz-Band Ultrasonic Waves in Solid-Liquid Mixture (Effects of Frequency and Sound Pressure)

2015 ◽  
Author(s):  
Yasuhiro Sugimoto ◽  
Tatsuya Haruna ◽  
Keiichi Sato
Keyword(s):  
Ultrasonic Wave ◽  
High Speed ◽  
Sound Pressure ◽  
Liquid Mixture ◽  
Present Report ◽  
Low Frequency ◽  
Video Camera ◽  
Ultrasonic Waves ◽  
Water Jet Cutting ◽  
Solid Liquid

It is important to separate and collect particles from solid-liquid mixture in order to reduce in environmental load and treatment cost of waste fluid. In this study, we try to separate and collect particles from the mixture by ultrasonic waves with relatively low frequency. In the present report, we use slurry of alumina abrasive as removal particles that use for polish and water jet cutting, etc. The particles are fully stirred in test water and then ultrasonic waves are irradiated with some frequencies. The particles behavior observed by a high-speed video camera is analyzed by a time series image analysis and correlated with sound pressure distribution. Particles flocculate to some layers like white bands that correspond to node of sound pressure after irradiation of ultrasonic wave. It is found that particles begin to move just after ultrasonic wave irradiation and flocculate clearly with the increase in sound pressure.

scholarly journals The flow and acoustic characteristics of underwater gas jets from large vertical exhaust nozzles

2018 ◽  
Vol 37 (1) ◽  
pp. 74-89
Author(s):  
Tiancheng Miao ◽  
Jingting Liu ◽  
Shijie Qin ◽  
Ning Chu ◽  
Dazhuan Wu ◽  
...  
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Sound Pressure ◽  
Low Frequency ◽  
Video Camera ◽  
Bubble Behavior ◽  
Acoustic Characteristics ◽  
Gas Jets ◽  
Audio Tape Recorder ◽  
Frequency Behavior

The flow and acoustic characteristics of underwater gas jets exhausted from large vertical nozzles are experimentally investigated in this work with gas flow rates of 30–150 m3/h, nozzle widths of d = 10 mm, 20 mm, 30 mm, and 40 mm. A high-speed digital video camera is used to examine bubble behavior and flow regimes. Sound pressure is measured by two hydrophones and recorded by a digital audio tape recorder. The audio and video signals are synchronized to find out the relationship between sound and gas behavior. Experimental results indicate that the general behavior of gas exhausted into water is of periodical necking and expansion. Sound pressure peaks are mostly excited by necking in two ways: pinch-off and redial expansion. Necking itself is a kind of low frequency behavior, corresponding to strong low frequency sounds. Moreover, necking can force the growing bubble to oscillate and emit broadband sound. As the gas velocity increases, necking would happen more frequently, and gas jets would grow into larger volume in shorter time, and then the sound radiated from the gas jets would have higher frequency and larger amplitude.

Laboratory experiments on compressional ultrasonic wave attenuation in partially frozen brines

Geophysics ◽  
2008 ◽  
Vol 73 (2) ◽  
pp. N9-N18 ◽  
Author(s):  
Jun Matsushima ◽  
Makoto Suzuki ◽  
Yoshibumi Kato ◽  
Takao Nibe ◽  
Shuichi Rokugawa
Keyword(s):  
Ultrasonic Wave ◽  
Laboratory Experiments ◽  
Wave Attenuation ◽  
Ultrasonic Attenuation ◽  
Liquid System ◽  
Seismic Attenuation ◽  
Ultrasonic Waves ◽  
Frequency Range ◽  
Pore Microstructure ◽  
Solid Liquid

Often, the loss mechanisms responsible for seismic attenuation are unclear and controversial. We used partially frozen brine as a solid-liquid coexistence system to investigate attenuation phenomena. Ultrasonic wave-transmission measurements on an ice-brine coexisting system were conducted to examine the influence of unfrozen brine in the pore microstructure on ultrasonic waves. We observed the variations of a 150–1000 kHz wave transmitted through a liquid system to a solid-liquid coexistence system, changing its temperature from [Formula: see text] to –[Formula: see text]. We quantitatively estimated attenuation in a frequency range of [Formula: see text] by considering different distances between the source and receiver transducers. We also estimated the total amount of frozen brine at each temperature by using the pulsed nuclear magnetic resonance (NMR) technique and related those results to attenuation results. The waveform analyses indicate that ultrasonic attenuation in an ice-brine coexisting system reaches its peak at [Formula: see text], at which the ratio of the liquid phase to the total volume in an ice-brine coexisting system is maximal. Finally, we obtained a highly positive correlation between the attenuation of ultrasonic waves and the total amount of unfrozen brine. Thus, laboratory experiments demonstrate that ultrasonic waves within this frequency range are affected significantly by the existence of unfrozen brine in the pore microstructure.

GS19 Observation of particle flocculation by ultrasonic waves in solid-liquid mixture

2014 ◽  
Vol 2014 (0) ◽  
pp. _GS19-1_-_GS19-2_
Author(s):  
Tatsuya HARUNA ◽  
Yasuhiro SUGIMOTO ◽  
Keiichi SATO
Keyword(s):  
Liquid Mixture ◽  
Ultrasonic Waves ◽  
Solid Liquid

An Experimental Study of Accelerated Cavitation Induced by Ultrasonics

1965 ◽  
Vol 87 (4) ◽  
pp. 967-976 ◽  
Author(s):  
F. Numachi
Keyword(s):  
Experimental Study ◽  
Frequency Spectrum ◽  
High Speed ◽  
Present Report ◽  
Ultrasonic Waves ◽  
High Speed Photography ◽  
Air Bubbles ◽  
The Waves

With a view to clarifying cavitation phenomena induced by ultrasonic waves, utilized recently in erosion tests, the frequency spectrum of the waves caused by cavitation was obtained, and the pattern of air bubbles produced were observed by high-speed photography. Some considerations also are given in the present report on the amount and form of erosion caused by cavitation.

Analysis of the Influence of Racks on High Speed Train Interior Noise Using Finite Element Method

2014 ◽  
Vol 675-677 ◽  
pp. 257-260 ◽  
Author(s):  
Di Wu ◽  
Jian Min Ge
Keyword(s):  
Finite Element ◽  
Sound Pressure Level ◽  
High Speed ◽  
Sound Pressure ◽  
Low Frequency ◽  
Sound Field ◽  
Pressure Level ◽  
High Speed Train ◽  
Fe Method ◽  
Proposed Model

In this paper, the finite element (FE) method was used for simulation of the low-frequency sound field in high speed train compartments. The proposed model was validated using experimental results. The FE models of the train compartments with and without racks were established respectively, and the sound pressure level of the standard point and sound field distribution in these two cases were compared. The results showed that the A-weighted sound pressure level of the standard point was 1.2 dB lower when there is no rack in the compartment.

Nonlinear Propagation of Amplitude-Modulated Ultrasonic Wave in Composite Material

2010 ◽  
Vol 452-453 ◽  
pp. 757-760
Author(s):  
Shiro Biwa ◽  
Kazuyoshi Nagae ◽  
Claude Inserra ◽  
Eiji Matsumoto
Keyword(s):  
Ultrasonic Wave ◽  
Low Frequency ◽  
Nonlinear Effects ◽  
Ultrasonic Waves ◽  
Nonlinear Propagation ◽  
Carrier Wave ◽  
Ultrasonic Wave Propagation ◽  
Frequency Components ◽  
Source Of Information ◽  
Longitudinal Ultrasonic Waves

Some nonlinear effects in the ultrasonic wave propagation in a unidirectional carbon/carbon (C/C) composite were examined experimentally. High-power amplitude-modulated longitudinal ultrasonic waves were sent to the C/C composite sample, and the nonlinear generation of low-frequency components was observed. Due to the heterogeneity and pre-existing damage of the composite, the carrier-wave component undergoes severe attenuation, and the low-frequency components were dominant in some situations. Such low-frequency components are found to grow in a nonlinear manner, and can be a useful source of information characterizing the nonlinearity of the material.

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