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Modeling and optimization of an acoustic diode based on micro-bubble nonlinearity
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10.1121/1.4773256
/content/asa/journal/jasa/133/2/10.1121/1.4773256
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/2/10.1121/1.4773256

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Schematic illustration of the acoustic diode.

Image of FIG. 2.
FIG. 2.

Allocations of the grid points and the variable assignments in temporal and spatial domains.

Image of FIG. 3.
FIG. 3.

(Color online) Size distributions of the utilized micro-bubble solutions. The hollow triangles are the data of SonoVue® from literature, the solid line is the corresponding fitted curve (denoted as “regular” distribution), and the dashed line is a hypothetical “narrow” distribution.

Image of FIG. 4.
FIG. 4.

(Color online) The frequency dependent transmission coefficients of the water-glass SLs with the periodicity number N SL = 2 (the solid line), 4 (the dashed line), and 10 (the dash-dot line).

Image of FIG. 5.
FIG. 5.

(Color online) The SHW pressure amplitude (normalized to 5 kPa) as a function of the bubble radius. κs  = 15 × 10−9 N, χ = 1 N/m, f 0 = 1.05 MHz, C dilute = 0.05 V/V%. The values corresponding to utilizing a “regular” and “narrow” size distribution are also marked in the figure with dashed lines.

Image of FIG. 6.
FIG. 6.

(Color online) SHW pressure amplitude (normalized to 5 kPa) as a function of shell elasticity and viscosity. f 0 = 1.05 MHz, C dilute = 0.05 V/V%, the “regular” bubble size distribution is applied.

Image of FIG. 7.
FIG. 7.

(Color online) (A), (B), and (C) are the energy transmission properties of the AD devices utilized in Ref. 2 corresponding to bubble concentrations of 0.025, 0.05, and 0.1 V/V%, respectively. (D) shows the SHW amplitude of the optimized AD model (normalized to 5 kPa) as a function of bubble concentration. f 0 = 1.05 MHz, χ = 0.55 N/m, and κs  = 7.2 × 10−9 N. The three points represent the three cases with the bubble concentrations of 0.025, 0.05, and 0.1 V/V%, respectively.

Image of FIG. 8.
FIG. 8.

(Color online) (A) is the frequency dependent energy transmission coefficient of the optimized AD; (B) compares the rectification ratio between the optimized AD and that utilized in Ref. 2 with a bubble concentration of 0.05 V/V%. [The solid line refers to the “positive” (+) incidence, the dashed line corresponds to the “negative” (−) incidence.]

Tables

Generic image for table
TABLE I.

Parameters used in FDTD simulations.

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/content/asa/journal/jasa/133/2/10.1121/1.4773256
2013-01-30
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Modeling and optimization of an acoustic diode based on micro-bubble nonlinearity
http://aip.metastore.ingenta.com/content/asa/journal/jasa/133/2/10.1121/1.4773256
10.1121/1.4773256
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