Measurement of the time evolution of Rayleigh streaming in high‐amplitude standing waves

2002 ◽  
Vol 112 (5) ◽  
pp. 2298-2298 ◽  
Author(s):  
Michael W. Thompson ◽  
Anthony A. Atchley
Keyword(s):  
Time Evolution ◽  
Standing Waves ◽  
High Amplitude ◽  
Rayleigh Streaming

Un-Shocked High Amplitude Standing Waves in Wave-Shaped Resonators

2012 ◽  
Author(s):  
Dion Savio Antao ◽  
Bakhtier Farouk
Keyword(s):  
Numerical Study ◽  
Fluid Dynamic ◽  
Ambient Pressure ◽  
Standing Waves ◽  
High Amplitude ◽  
Prime Mover ◽  
Non Linear ◽  
Resonator System ◽  
Cylindrical Resonators ◽  
Linear Nature

A numerical study of non-linear, high amplitude standing waves in non-cylindrical circular resonators is reported here. These waves are shock-less and can generate peak acoustic overpressures that can exceed the ambient pressure by three/four times its nominal value. A high fidelity compressible computational fluid dynamic model is used to simulate the phenomena in cylindrical and arbitrarily shaped axisymmetric resonators. A right circular cylinder and frustum of cone are the two geometries studied. The model is validated using past numerical and experimental results of standing waves in cylindrical resonators. The non-linear nature of the harmonic response of the frustum of cone resonator system is investigated for two different working fluids (carbon dioxide and argon) operating at various values of piston amplitude. The high amplitude non-linear oscillations demonstrated can be used as a prime mover in a variety of applications including thermoacoustic cryocooling.

Optimal shaping of acoustic resonators for the generation of high-amplitude standing waves

2014 ◽  
Vol 136 (3) ◽  
pp. 1003-1012 ◽  
Author(s):  
Milan Červenka ◽  
Martin Šoltés ◽  
Michal Bednařík
Keyword(s):  
Standing Waves ◽  
High Amplitude ◽  
Acoustic Resonators

Highly nonlinear standing water waves with small capillary effect

1998 ◽  
Vol 369 ◽  
pp. 253-272 ◽  
Author(s):  
WILLIAM W. SCHULTZ ◽  
JEAN-MARC VANDEN-BROECK ◽  
LEI JIANG ◽  
MARC PERLIN
Keyword(s):  
Surface Tension ◽  
Water Waves ◽  
Standing Waves ◽  
High Amplitude ◽  
Boundary Integral ◽  
Boundary Integral Method ◽  
Ripple Formation ◽  
Node Distribution ◽  
Highly Nonlinear ◽  
Periodic Standing Waves

We calculate spatially and temporally periodic standing waves using a spectral boundary integral method combined with Newton iteration. When surface tension is neglected, the non-monotonic behaviour of global wave properties agrees with previous computations by Mercer & Roberts (1992). New accurate results near the limiting form of gravity waves are obtained by using a non-uniform node distribution. It is shown that the crest angle is smaller than 90° at the largest calculated crest curvature. When a small amount of surface tension is included, the crest form is changed significantly. It is necessary to include surface tension to numerically reproduce the steep standing waves in Taylor's (1953) experiments. Faraday-wave experiments in a large-aspect-ratio rectangular container agree with our computations. This is the first time such high-amplitude, periodic waves appear to have been observed in laboratory conditions. Ripple formation and temporal symmetry breaking in the experiments are discussed.

A Methodology for Controlling Slopping in Copper Converters by Using Lateral and Bottom Gas Injection

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Marco Rosales ◽  
Alvaro Valencia ◽  
Ramón Fuentes
Keyword(s):  
Surface Wave ◽  
Froude Number ◽  
Refractory Lining ◽  
Gas Injection ◽  
Standing Waves ◽  
High Amplitude ◽  
Experimental Results ◽  
Water Model ◽  
Copper Converter ◽  
Oscillation Modes

We investigated, experimentally and theoretically, the formation of slopping in a 1:5 scaled water model of a copper converter. The gas injected through submerged tuyeres in the copper converters results in slopping; the formation of standing waves. The high amplitude of the standing waves contributes to the premature wearing down of the converter's refractory lining. We present a methodology for controlling slopping by using two submerged tuyere lines. The combined lateral and bottom gas injection reduces the amplitude of the slopping by interfering with the oscillation modes of the surface wave. For a Froude number of 10 for both sets of tuyeres, the experimental results showed a 50% reduction in the amplitude of the surface wave in the water model.

X-ray standing waves—a new method of studying the structure of crystals

1986 ◽  
Vol 149 (05) ◽  
pp. 69-103 ◽  
Author(s):  
M.V. Koval'chuk ◽  
V.G. Kohn
Keyword(s):  
Standing Waves ◽  
New Method ◽  
X Ray
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