Measurement of the acoustic velocity field of nonlinear standing waves using the synchronized PIV technique

Nabavi, Majid; Siddiqui, Kamran; Dargahi, Javad

doi:10.1016/j.expthermflusci.2008.07.013

Cited by 22 publications

(8 citation statements)

References 28 publications

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“…Among these velocity fields associated with the valveless SWP, the acoustic and streaming velocity fields inside a standing wave resonator ͑without inlet and outlet͒ have been extensively studied analytically, 19 numerically, 17 and experimentally. 16,18,20,21 However, the interactions of the pumped fluid velocity field and acoustic and streaming patterns have not been investigated. The knowledge of these interactions is vital for the development of an efficient valveless SWP.…”

Section: Different Velocity Fields Associated With the Valvelessmentioning

confidence: 98%

Analysis of the flow structure inside the valveless standing wave pump

2008

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The flow structure inside the valveless standing wave pump is investigated experimentally. The two-dimensional velocity fields inside the chamber of this novel pump at different phases of the excitation signal are measured using the synchronized particle image velocimetry technique. The variations in the pump flow rate, pressure loss coefficients, and rectification capability of the diffuser-nozzle element are analyzed. According to the results obtained in this paper, the net flow rate of the pump increases with an increase in the pressure ͑or Reynolds number͒. The interactions of three different flow fields inside the pump chamber ͑pumping flow, acoustic, and streaming velocities͒ are studied. It is found that, while the pumping flow has an effect on the acoustic velocity patterns only around the inlet and outlet orifices, the streaming velocity structures are drastically affected by the pumping flow.

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Section: Different Velocity Fields Associated With the Valvelessmentioning

confidence: 98%

Analysis of the flow structure inside the valveless standing wave pump

2008

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“…Nabavi describes the utilization of the particle image velocimetry technique to measure the velocity of the standing waves within an air-filled rigid-walled square channel subjected to acoustic standing waves. The data were compared with the analytical results obtained from the time-harmonic solution of the wave equation [22].…”

Section: Measuring Methodsmentioning

confidence: 99%

Resonance Effect of Nanofibrous Membrane for Sound Absorption Applications

Kalinová¹

2017

Resonance

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Nanofibrous layers have unique acoustic properties due to the large specific surface area of the nanofibers, where viscous losses may occur and also the ability of the nanofiber layer to resonate at its own frequency. The resonance membrane is then, upon impact of sound waves of low frequency, brought into forced vibrations, whereby the kinetic energy of the membrane is converted into thermal energy by friction of individual nanofibers, by the friction of the membrane with ambient air, and possibly with other layers of material arranged in its proximity, and part of the energy is also transmitted to the frame, by which means the vibrations of the resonance membrane are damped. When sound waves hit the nanofiber membrane, they introduce forced vibrations in the case of resonance which have maximal amplitude. The principle of the technology is achieved by the synergy of perforated plate in the form of a cavity resonator with nanofibrous layer in the form of resonant membrane. The parameters of the resonant nanofibrous membrane together with the shape and volume of the perforations then determine which sound frequencies will be damped and to what extent.

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“…If we use a simple tone as an excitation signal, phase number is about a few to tens [6][7][8][9]. Many authors mention the use of phase-locked PIV in their investigation of hydrodynamic field excited acoustically [10][11][12][13].…”

Section: Phase-locked Particle Image Velocimetrymentioning

confidence: 99%

Systematic Error of Acoustic Particle Image Velocimetry and Its Correction

Mickiewicz¹

2014

Metrology and Measurement Systems

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Particle Image Velocimetry is getting more and more often the method of choice not only for visualization of turbulent mass flows in fluid mechanics, but also in linear and non-linear acoustics for non-intrusive visualization of acoustic particle velocity. Particle Image Velocimetry with low sampling rate (about 15Hz) can be applied to visualize the acoustic field using the acquisition synchronized to the excitation signal. Such phaselocked PIV technique is described and used in experiments presented in the paper. The main goal of research was to propose a model of PIV systematic error due to non-zero time interval between acquisitions of two images of the examined sound field seeded with tracer particles, what affects the measurement of complex acoustic signals. Usefulness of the presented model is confirmed experimentally. The correction procedure, based on the proposed model, applied to measurement data increases the accuracy of acoustic particle velocity field visualization and creates new possibilities in observation of sound fields excited with multi-tonal or bandlimited noise signals.

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Measurement of the acoustic velocity field of nonlinear standing waves using the synchronized PIV technique

Cited by 22 publications

References 28 publications

Analysis of the flow structure inside the valveless standing wave pump

Analysis of the flow structure inside the valveless standing wave pump

Resonance Effect of Nanofibrous Membrane for Sound Absorption Applications

Systematic Error of Acoustic Particle Image Velocimetry and Its Correction

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