Acoustic and velocity field over 3D cavities

Simultaneous measurements with 3D PIV and Acoustic Doppler Velocity Profiler

Simultaneous velocity measurements were taken using Particle Image Velocimetry (PIV) and an Acoustic Doppler Velocity Profiler (ADVP) in a sharp open-channel bend with an immobile gravel bed. The PIV measures 3D velocity vectors in a vertical plane (~40cm x 20cm) at a frequency of 7.5 Hz, whereas the ADVP measures 3D velocity vectors in a vertical profile with a frequency of 31.25 Hz. The paper...

Acoustic Field Effects on Minimum Fluidization Velocity in a 3d Fluidized Bed

Fluidized beds are used in a variety of process industries because they provide uniform temperature distributions, low pressure drops, and high heat/mass rates. Minimum fluidization velocity is an important factor in understanding the hydrodynamic behavior of fluidized beds, and this characteristic may be modified through high frequency (sound) vibrations. The effects caused by sound wave frequ...

Acoustic Modes in Spheroidal Cavities

Oscillation modes of rapidly rotating stars have not yet been calculated with precision, rotational effects being generally approximated by perturbation methods. We are developing a numerical method able to account for the deformation of the star by the centrifugal force and, as a first step, we determined the acoustic modes of a uniform density spheroid and studied how the spheroid flatness af...

Near field acoustic holography with particle velocity transducers

Tunable coupled surface acoustic cavities

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