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Acoustic particle velocity horns
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View: Figures


Image of FIG. 1.
FIG. 1.

Open horn configuration (left) and illustration of the superposition approach (right) showing throat and mouth variables at x 1 and x 2, respectively.

Image of FIG. 2.
FIG. 2.

Double-horn configuration.

Image of FIG. 3.
FIG. 3.

(Color online) Numerically modeled particle velocity fields (absolute value) within a double, axisymmetrical, conical horn at frequencies from 1 Hz to 5000 Hz. Horn dimensions: l = 20 cm, R 1 = 1 cm, R 2 = 10 cm. Horn’s first resonance occurs at 2650 Hz.

Image of FIG. 4.
FIG. 4.

Frequency dependence of acoustic particle velocity amplification factor for pipe having a radius R = 0.01 m and length l = 0.2 m in water. Dashed line: numerical solution, solid line: analytical solution, as per Eqs. (13) and (18).

Image of FIG. 5.
FIG. 5.

Axial velocity amplification factors (at the axis of the horn) vs frequency at the throat of single conical, Eqs. (13) and (19); double conical, Eqs. (29) and (19); horns and exponential single horn, Eqs. (13) and (20). For all horns: throat radius R 1 = 1 cm, single horn length l = 20 cm, mouth radius R 2 = 10 cm. Dashed lines: numerical solutions, solid lines: analytical solutions.

Image of FIG. 6.
FIG. 6.

Conical AVH geometrical parameters.

Image of FIG. 7.
FIG. 7.

Velocity amplification vs throat radius R 1 [per Fig. 6(a)] for cone with fixed lengths l and a fixed radii ratio K = R 2/R 1 = 10.

Image of FIG. 8.
FIG. 8.

Horn amplification vs length [per Fig. 6(b)] for fixed radii ratios K = R 2/R 1, and a fixed throat radius R 1 = 1 cm. Dashed lines show cone angles α corresponding to the length and radii.

Image of FIG. 9.
FIG. 9.

Horn amplification vs mouth-to-throat radii ratio K [per Fig. 6(c)] for fixed lengths and a fixed throat radius R 1 = 1 cm.

Image of FIG. 10.
FIG. 10.

Axial particle velocity distribution, in water, in a single AVH (upper) and double AVH (lower). AVH dimensions are l = 20 cm, R 1 = 1 cm, K = 10, and the frequency was 50 Hz.

Image of FIG. 11.
FIG. 11.

Frequency responses (in water) of single (dashed line) and double (solid line) horns with the same overall length of 20 cm, and a throat and mouth radii of 1 cm and 10 cm, respectively.

Image of FIG. 12.
FIG. 12.

COMSOL computed AVH polar directionality patterns for 1 Hz, 600 Hz, and 1 kHz single conical horn, L = 10 cm, R throat = 1 cm, K = 5. Gray dashed line is scaled to A = 4 corresponding to the computed amplification (radial division represents velocity amplification factor).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Acoustic particle velocity horns