An Experimental Study on the Coherence and Modal Structure of the Broadband Sound Field in Fan Inlet Duct

2019 ◽  
Author(s):  
Liangfeng Wang ◽  
Kunbo Xu ◽  
Hang Tong ◽  
Luqin Mao ◽  
Weiyang Qiao
Keyword(s):  
Experimental Study ◽  
Sound Field ◽  
Modal Structure ◽  
Broadband Sound ◽  
Inlet Duct

108 Experimental study on the formation of bubble cluster in a standing sound field

2012 ◽  
Vol 2012.48 (0) ◽  
pp. 20-21
Author(s):  
Taiichi TARUSAWA ◽  
Torn FUKUSHI ◽  
Minori SHIROTA ◽  
Takao INAMURA
Keyword(s):  
Experimental Study ◽  
Sound Field ◽  
Bubble Cluster ◽  
Standing Sound

An experimental study of the sound field in a large atrium

2012 ◽  
Vol 58 ◽  
pp. 91-102 ◽  
Author(s):  
Hongyuan Mei ◽  
Jian Kang
Keyword(s):  
Experimental Study ◽  
Sound Field

Fragmentation of acoustically levitating droplets by laser-induced cavitation bubbles

2016 ◽  
Vol 805 ◽  
pp. 551-576 ◽  
Author(s):  
Silvestre Roberto Gonzalez Avila ◽  
Claus-Dieter Ohl
Keyword(s):  
Shock Wave ◽  
Experimental Study ◽  
Surface Tension ◽  
Cavitation Bubble ◽  
High Speed ◽  
Size Range ◽  
Sound Field ◽  
Negative Pressures ◽  
Impulsive Pressure ◽  
Small Bubbles

We report on an experimental study on the dynamics and fragmentation of water droplets levitated in a sound field exposed to a single laser-induced cavitation bubble. The nucleation of the cavitation bubble leads to a shock wave travelling inside the droplet and reflected from pressure release surfaces. Experiments and simulations study the location of the high negative pressures inside the droplet which result into secondary cavitation. Later, three distinct fragmentation scenarios are observed: rapid atomization, sheet formation and coarse fragmentation. Rapid atomization occurs when the expanding bubble, still at high pressure, ruptures the liquid film separating the bubble from the surrounding air and a shock wave is launched into the surrounding air. Sheet formation occurs due to the momentum transfer of the expanding bubble; for sufficiently small bubbles, the sheet retracts because of surface tension, while larger bubbles may cause the fragmentation of the sheet. Coarse fragmentation is observed after the first collapse of the bubble, where high-speed jets emanate from the surface of the droplet. They are the result of surface instability of the droplet combined with the impulsive pressure generated during collapse. A parameter plot for droplets in the size range between 0.17 and 1.5 mm and laser energies between 0.2 and 4.0 mJ allows the separation of these three regimes.

scholarly journals An Experimental Study of the Special Aspects of Scalar-Vector Sound Field Spatial Structures in the Shallow Sea Area

2018 ◽  
Vol 8 (2) ◽  
pp. 157 ◽  
Author(s):  
Yury Morgunov ◽  
Aleksandr Golov ◽  
Aleksandr Burenin ◽  
Peter Unru ◽  
Aleksandr Rodionov ◽  
...  
Keyword(s):  
Experimental Study ◽  
Sound Field ◽  
Spatial Structures ◽  
Shallow Sea ◽  
Sea Area

Equilibrium of liquid drops under the effects of rotation and acoustic flattening: results from USML-2 experiments in Space

1998 ◽  
Vol 354 ◽  
pp. 43-67 ◽  
Author(s):  
C. P. LEE ◽  
A. V. ANILKUMAR ◽  
A. B. HMELO ◽  
T. G. WANG
Keyword(s):  
Experimental Study ◽  
Angular Velocity ◽  
Liquid Drop ◽  
Sound Field ◽  
Theoretical Models ◽  
Liquid Drops ◽  
Complementary Effect ◽  
Rotating Liquid ◽  
Neutral Equilibrium ◽  
Effects Of Rotation

Previous Space-based experiments (Wang et al. 1994a) showed that a rotating liquid drop bifurcates into a two-lobed shape at a lower critical angular velocity, if it is flattened acoustically by the leviating sound field. In this work, we undertake a systematic experimental study of the effect of acoustic flattening on the rotational bifurcation of a liquid drop. We also look into the complementary effect of rotation on the equilibrium of an acoustically drastically flattened drop. Theoretical models are developed for each of the two effects and then woven into a unified picture. The first effect concerns neutral equilibrium, while the second concerns loss of equilibrium, neither of them involving instability. The theories agree well with the experiments.

scholarly journals EXPERIMENTAL STUDY ON REPRODUCTION SYSTEM OF SOUND FIELD AND THE SENSE OF HEARING ON FLOOR IMPACT SOUND

2001 ◽  
Vol 7 (13) ◽  
pp. 107-112
Author(s):  
Takefumi ZAIMA ◽  
Noboru KAMIAKITO ◽  
Tomoyuki NAGASE ◽  
Masanao OWAKI ◽  
Yasuhiro YAMASHITA
Keyword(s):  
Experimental Study ◽  
Sound Field ◽  
Reproduction System
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