Formation of a submillimeter bubble from an orifice using pulsed acoustic pressure waves in gas phase

2008 ◽  
Vol 20 (4) ◽  
pp. 043301 ◽  
Author(s):  
Minori Shirota ◽  
Toshiyuki Sanada ◽  
Ayaka Sato ◽  
Masao Watanabe
Keyword(s):  
Gas Phase ◽  
Acoustic Pressure ◽  
Pressure Waves

scholarly journals Utilizing acoustic pressure waves for sensing fluid properties

2011 ◽  
Vol 25 ◽  
pp. 775-778 ◽  
Author(s):  
H. Antlinger ◽  
S. Clara ◽  
R. Beigelbeck ◽  
S. Cerimovic ◽  
F. Keplinger ◽  
...  
Keyword(s):  
Acoustic Pressure ◽  
Pressure Waves ◽  
Fluid Properties

Enhanced Water Removal from PEM Fuel Cells Using Acoustic Pressure Waves

2019 ◽  
Vol 166 (7) ◽  
pp. F3143-F3153 ◽  
Author(s):  
Mehdi Mortazavi ◽  
Anthony D. Santamaria ◽  
Jingru Z. Benner ◽  
Vedang Chauhan
Keyword(s):  
Fuel Cells ◽  
Acoustic Pressure ◽  
Pem Fuel Cells ◽  
Water Removal ◽  
Pressure Waves

A Comparison of Mechanical Wind Filters for Infrasound Sensor Noise Reduction

2021 ◽  
Author(s):  
Sarah McComas ◽  
Chris Hayward ◽  
Stephen Arrowsmith ◽  
Brian Stump ◽  
Mihan H. McKenna Taylor
Keyword(s):  
Data Analysis ◽  
Atmospheric Turbulence ◽  
Acoustic Pressure ◽  
Urban Setting ◽  
Pressure Waves ◽  
Earth Atmosphere ◽  
Acoustic Spectrum ◽  
Single Sensor ◽  
Insight Into

Abstract Infrasound sensors record the ambient acoustic field that contains not only signals of interest but also noise and clutter. Noise is defined as atmospheric turbulence that is incoherent over the distances of meters, whereas, signals of interest and clutter are acoustic pressure waves that are coherent over 10s of meters to 100s of kilometers. There is a growing interest in monitoring sources that extend across the acoustic spectrum from infrasound (below 20 Hz) into the low-end audible acoustic (20–1000 Hz). Monitoring of these extended band signals with a single sensor is made possible with the development of contemporary infrasound sensors, such as Hyperion IFS-3000 with a flat response from 0.01 to 1000 Hz. Combining infrasound sensors with seismometers provides opportunity to better assess noise contributions for both sensor types and improve characterization of sources that occur close to the solid earth–atmosphere boundary. Because sensors are installed to target these broadband acoustic sources, considerations need to be made when selecting a mechanical wind filter to mitigate the noise, while minimizing the impacts to the signals of interest across these frequency ranges. Motivated by these opportunities, this article compares traditional infrasound wind filter designs, that is, porous hoses rosettes and domes, in an urban setting for frequencies 0.01–45 Hz. Data analysis compares the filters, in terms of their response to noise and signals with direct comparisons of wind filters, as a function of frequency. The quantification of performance of these filters in an urban setting provides insight into their effects on detection of sources of interest in this environment.

A three PZT setup for determining physical liquid properties utilizing acoustic pressure waves

2013 ◽  
Author(s):  
H. Antlinger ◽  
S. Clara ◽  
B. Jakoby ◽  
R. Beigelbeck ◽  
S. Cerimovic ◽  
...  
Keyword(s):  
Acoustic Pressure ◽  
Pressure Waves

scholarly journals Acoustic Pressure Waves in Vibrating 3-D Laminated Beam-Plate Enclosures

2009 ◽  
Vol 2009 ◽  
pp. 1-14 ◽  
Author(s):  
Charles A. Osheku ◽  
Vincent O. S. Olunloyo ◽  
O. Damisa ◽  
Theddeus T. Akano
Keyword(s):  
Closed Form ◽  
Acoustic Pressure ◽  
Wave Interaction ◽  
Integral Transforms ◽  
Structural Vibration ◽  
Mode Shapes ◽  
Closed Form Expression ◽  
Pressure Waves ◽  
Laminated Beam ◽  
Boundary Surfaces

The effect of structural vibration on the propagation of acoustic pressure waves through a cantilevered 3-D laminated beam-plate enclosure is investigated analytically. For this problem, a set of well-posed partial differential equations governing the vibroacoustic wave interaction phenomenon are formulated and matched for the various vibrating boundary surfaces. By employing integral transforms, a closed form analytical expression is computed suitable for vibroacoustic modeling, design analysis, and general aerospace defensive applications. The closed-form expression takes the form of a kernel of polynomials for acoustic pressure waves showing the influence of linear interface pressure variation across the axes of vibrating boundary surfaces. Simulated results demonstrate how the mode shapes and the associated natural frequencies can be easily computed. It is shown in this paper that acoustic pressure waves propagation are dynamically stable through laminated enclosures with progressive decrement in interfacial pressure distribution under the influence of high excitation frequencies irrespective of whether the induced flow is subsonic, sonic , supersonic, or hypersonic. Hence, in practice, dynamic stability of hypersonic aircrafts or jet airplanes can be further enhanced by replacing their noise transmission systems with laminated enclosures.

Droplet Dynamics and Removal from Polymer Electrolyte Fuel Cell Channels Using Acoustic Pressure Waves

2019 ◽  
Vol 92 (8) ◽  
pp. 387-393
Author(s):  
Preston R. Stolberg ◽  
Alexander Coverdill ◽  
Mehdi Mortazavi ◽  
Jingru Benner ◽  
Vedang Chauhan ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Acoustic Pressure ◽  
Polymer Electrolyte Fuel Cell ◽  
Pressure Waves ◽  
Droplet Dynamics
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