The propagation of acoustic waves in a cylindrical vessel

2007 ◽  
Vol 5 ◽  
pp. 133-138
Author(s):  
N.K. Vakhitova ◽  
N.A. Makhota
Keyword(s):  
Acoustic Waves ◽  
Standing Waves ◽  
Cylindrical Vessel

The problem of the propagation of acoustic waves in a cylindrical vessel filled with a liquid is solved numerically. The possibility of forming standing waves is shown.

scholarly journals Standing Waves in One-Dimensional Resonator Containing an Ideal Isothermal Gas Affected by the Constant Mass Force

2017 ◽  
Vol 42 (2) ◽  
pp. 263-271
Author(s):  
Anna Perelomova
Keyword(s):  
Boundary Conditions ◽  
Acoustic Waves ◽  
Standing Waves ◽  
Ideal Gas ◽  
Excess Pressure ◽  
Mass Force ◽  
Constant Mass ◽  
Total Field ◽  
One Dimensional ◽  
Isothermal Gas

Abstract The study is devoted to standing acoustic waves in one-dimensional planar resonator which containing an ideal gas. A gas is affected by the constant mass force. Two types of physically justified boundary conditions are considered: zero velocity or zero excess pressure at both boundaries. The variety of nodal and antinodal points is determined. The conclusion is that the nodes of pressure and antinodes of velocity do not longer coincide, as well as antinodes of pressure and nodes of velocity. The entropy mode may contribute to the total field in a resonator. It is no longer isobaric, in contrast to the case when the external force is absent. Examples of perturbations inherent to the entropy mode in the volume of a resonator are discussed.

Experimental study of interaction of bubble media with acoustic field

2017 ◽  
Vol 12 (2) ◽  
pp. 180-186
Author(s):  
S.P. Sametov
Keyword(s):  
Acoustic Waves ◽  
Standing Waves ◽  
Ultrasonic Field ◽  
Experimental Measurements ◽  
Air Bubbles ◽  
Closed Volume ◽  
Bubble Liquid ◽  
Ultrasonic Fields ◽  
Displacement Front ◽  
Bubble Media

In the paper, the procedure for performing experimental measurements and the results of studies on the dynamics of interaction of ultrasonic fields with a bubble liquid in a closed volume with reflecting walls and a free surface were detailed description. The influence of different concentrations of bubbles in the liquid on the nature of the purification of the medium from them is considered. In a bubble liquid, the velocity of acoustic waves decreases substantially, which leads to a redistribution of the conditions for the formation of standing waves. It was found that an increase in concentration leads to a more intensive displacement of air bubbles by an ultrasonic field with forming of a displacement front.

Internal Standing Waves in a Cylindrical Vessel and Their Near-Wall Features

1993 ◽  
Vol 115 (3) ◽  
pp. 613-620 ◽  
Author(s):  
S. Ushijima ◽  
S. Moriya ◽  
N. Tanaka
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Internal Wave ◽  
Turbulence Model ◽  
Standing Waves ◽  
Prediction Method ◽  
Temperature Fluctuations ◽  
Cylindrical Vessel ◽  
Experimental Investigations ◽  
Near Wall

This paper describes numerical and experimental investigations on internal standing waves occurring in a cylindrical vessel and their near-wall behavior in the vicinity of an adiabatic cylinder located at the center of the vessel. A numerical prediction method was developed with a low-Reynolds-number turbulence model to stimulate the occurrence of the internal standing waves and their near-wall features. These features are characterized by the attenuation and phase shifts in temperature fluctuations as observed in the present experiments. The measured results were well predicted by the numerical simulation in terms of certain statistical values as well as qualitative internal wave motions and flow patterns.

Heat Transfer Enhancement by Acoustic Streaming in an Enclosure

2005 ◽  
Vol 127 (12) ◽  
pp. 1313-1321 ◽  
Author(s):  
Murat K. Aktas ◽  
Bakhtier Farouk ◽  
Yiqiang Lin
Keyword(s):  
Heat Transfer ◽  
Acoustic Waves ◽  
Numerical Solutions ◽  
Stokes Equations ◽  
Acoustic Streaming ◽  
Standing Waves ◽  
Side Wall ◽  
Temperature Fields ◽  
Vertical Side ◽  
Acoustic Standing Wave

Thermal convection in a differentially heated shallow enclosure due to acoustic excitations induced by the vibration of a vertical side wall is investigated numerically. The fully compressible form of the Navier-Stokes equations is considered and an explicit time-marching algorithm is used to track the acoustic waves. Numerical solutions are obtained by employing a highly accurate flux corrected transport algorithm. The frequency of the wall vibration is chosen such that an acoustic standing wave forms in the enclosure. The interaction of the acoustic standing waves and the fluid properties trigger steady secondary streaming flows in the enclosure. Simulations were also carried out for “off-design” vibration frequency where no standing waves were formed. The effects of steady second order acoustic streaming structures are found to be more significant than the main oscillatory flow field on the heat transfer rates. The model developed can be used for the analysis of flow and temperature fields driven by acoustic transducers and in the design of high performance resonators for acoustic compressors.

scholarly journals Acoustic Wave Properties in Footpoints of Coronal Loops in 3D MHD Simulations

2021 ◽  
Vol 922 (2) ◽  
pp. 225
Author(s):  
Julia M. Riedl ◽  
Tom Van Doorsselaere ◽  
Fabio Reale ◽  
Marcel Goossens ◽  
Antonino Petralia ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Acoustic Waves ◽  
Standing Waves ◽  
Initial Energy ◽  
Solar Chromosphere ◽  
Coronal Loops ◽  
Mhd Simulations ◽  
Wave Flux ◽  
The Waves ◽  
Wave Properties

Abstract Acoustic waves excited in the photosphere and below might play an integral part in the heating of the solar chromosphere and corona. However, it is yet not fully clear how much of the initially acoustic wave flux reaches the corona and in what form. We investigate the wave propagation, damping, transmission, and conversion in the lower layers of the solar atmosphere using 3D numerical MHD simulations. A model of a gravitationally stratified expanding straight coronal loop, stretching from photosphere to photosphere, is perturbed at one footpoint by an acoustic driver with a period of 370 s. For this period, acoustic cutoff regions are present below the transition region (TR). About 2% of the initial energy from the driver reaches the corona. The shape of the cutoff regions and the height of the TR show a highly dynamic behavior. Taking only the driven waves into account, the waves have a propagating nature below and above the cutoff region, but are standing and evanescent within the cutoff region. Studying the driven waves together with the background motions in the model reveals standing waves between the cutoff region and the TR. These standing waves cause an oscillation of the TR height. In addition, fast or leaky sausage body-like waves might have been excited close to the base of the loop. These waves then possibly convert to fast or leaky sausage surface-like waves at the top of the main cutoff region, followed by a conversion to slow sausage body-like waves around the TR.

scholarly journals Measurement of material volumes in a cylindrical silo using acoustic wave and resonance frequency analysis

2020 ◽  
Vol 9 (4) ◽  
pp. 1585-1594
Author(s):  
Chukiet Sodsri
Keyword(s):  
Resonance Frequency ◽  
Frequency Analysis ◽  
Acoustic Waves ◽  
Standing Waves ◽  
Wave Mode ◽  
Rice Grain ◽  
Resonance Frequency Analysis ◽  
Resonance Frequencies ◽  
Material Volume ◽  
Time Invariant

This work presents an approach for measuring material volumes in a closed cylindrical silo by using acoustic waves and resonance frequency analysis of silo’s acoustic systems. With an assumption that the acoustical systems were linear and time-invariant, frequency responses of the systems were identified via measurement. A sine sweep was generated, amplified and fed to a loudspeaker inside the silo. Acoustic waves were picked up by a microphone and processed to yield the silo's frequency response. Resonance frequencies and wave mode numbers of standing waves in the frequency range below 900 Hz were analyzed and used for calculation of air-cavity lengths. With known silo's dimension, the material volume estimations were achieved. Sets of experiments for estimating volumes of sand, cement, water, rice grain, and stone flakes in a closed silo, were done. It was found that the approach could successfully estimate the volumes of sand, cement, and water with a satisfactory accuracy. Percent errors of the estimations were less than 3% from the actual volumes. However, the approach could not estimate the volume of rice grain and stone flakes, since their sound refractions were neither resulted in standing waves nor acoustical modes in the silo.

X-ray standing waves effects for a multilayer mirror modulated by surface acoustic waves

1999 ◽  
Vol 75 (5) ◽  
pp. 639-640 ◽  
Author(s):  
D. V. Roshchupkin ◽  
R. Tucoulou ◽  
M. Brunel
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Standing Waves ◽  
X Ray ◽  
Multilayer Mirror

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

1975 ◽  
Vol 33 ◽  
pp. 86-87
Author(s):  
Kemining W. Yeh ◽  
Richard S. Muller ◽  
Wei-Kuo Wu ◽  
Jack Washburn
Keyword(s):  
Integrated Circuit ◽  
Acoustic Waves ◽  
New Technology ◽  
Surface Acoustic Waves ◽  
Electromechanical Properties ◽  
Leading Role ◽  
Saw Devices ◽  
Transmission Electron ◽  
High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

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