Harmonic radiation from a liquid-filled spherical acoustic lens with an internal eccentric spherical source

Hasheminejad, Seyyed M.; Azarpeyvand, Mahdi

doi:10.1016/j.mechrescom.2004.02.005

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…William 首先提出了偏心球模型并计算了偏心球源的声辐射力 [25] , 随后 Roumeliotis 等发现由于引入偏心内球而引起的硬壁球形腔声共振频率偏移 [26] . Hasheminejad 和 Azarpeyvand 对内置的偏心辐射源散射场做了研究, 指出密封外壳的存在导致模态阻力和惯性振幅的明显增强 [27] . Zang 等建立理论模型探究了位于零阶贝塞尔声束中双层偏心液滴中偏心球的位置对负向声辐射力产生的影响, 指出当偏心球位于液体球心右侧时会产生负向声辐射力 [29] .…”

Section: 细胞的声操控是实现细胞筛选、分离的关键声操控应用的基础是声辐射力unclassified

Acoustic radiation force of elastic spherical shell with eccentric droplet in plane wave acoustic field

Pan¹,

Li²,

Du³

et al. 2023

Acta Phys. Sin.

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Based on the application of acoustic waves in cell manipulation, a model consist of an elastic spherical shell and eccentric droplet is established to simulate a eukaryotic cell and analyze the acoustic radiation force (ARF) on the cell. In this paper, we derived an exact expression for the ARF on the liquid-filled spherical shell. The influence of eccentric distance, radius of the eccentric droplet and impedance of the medium inside the liquid-filled spherical shell on the ARF are analyzed numerically. Results show that the ARF is very sensitive to the position and size of the eccentric droplet. As the eccentricity of the eccentric droplet increases, the ARF becomes greater. In the low frequency region (ka<3) the resonance peak point increases, and the position of the curve ventral point shifts in the high frequency region (ka>3) with the increase of the radius of the eccentric droplet. The effect of the position variations on the ARF is more significant than radius change, and the impact of both will be promoted on each other. The ARF as a function of ka is mainly affected by the variation of the nucleus characteristic impedance. The ARF amplitude around ka=5 increases and the position of the ventral point tends to shift to the right with the enlargement of the nucleus impedance. Therefore, the radiation response at a certain frequency or cell size range can be enhanced when the nuclear impedance increase. The results of this paper provide theoretical basis for the cell sorting and targeted therapy.

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Section: 细胞的声操控是实现细胞筛选、分离的关键声操控应用的基础是声辐射力unclassified

Acoustic radiation force of elastic spherical shell with eccentric droplet in plane wave acoustic field

Pan¹,

Li²,

Du³

et al. 2023

Acta Phys. Sin.

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“…the pulsating, n = 0, and the oscillating, n = 1, sources) are of most practical interest as they are well known to best represent the common "expander" and "shaker" type acoustic transducers, respectively. 35 A FORTRAN code was constructed for treating boundary conditions, to determine the unknown modal coefficients, and to compute the modal impedance matrix, Z = SR −1 , and other relevant acoustic quantities as functions of the distance parameter, kr 0 , at selected nondimensional frequencies, ka = ωa/c. The computations were performed on personal computers with a truncation constant of n max = 100 to assure convergence in the high frequency range, and also in case of close proximity of the source to the thermoviscous sphere.…”

Section: Numerical Implementationmentioning

confidence: 99%

Computation of Acoustic Field Radiated by a Spherical Source Near a Thermoviscous Fluid Sphere

Hasheminejad

Pasdar

2007

J. Comp. Acous.

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Acoustic radiation from a spherical source, vibrating with an arbitrary, axisymmetric, timeharmonic surface velocity distribution, while immersed near a thermoviscous fluid sphere suspended in an unbounded viscous thermally conducting fluid medium is computed. The formulation utilizes the appropriate wave field expansions and boundary conditions along with the translational addition theorem for spherical wave functions to develop a closed-form solution in form of infinite series. The prime objective is to investigate the thermoviscous loss effects on acoustic radiation and its associated field quantities. The analytical results are illustrated with a numerical example in which the spherical source, that may vibrate either in a monopole-like or a dipole-like mode, is suspended in a thermoviscous fluid medium near an equal-sized viscous thermally conducting fluid sphere. To avoid numerical difficulties normally arising in process of solving thermoviscous radiation/scattering problems in the frequency range of interest, a basic multiple precision FORTRAN computation package was utilized in developing specialized codes for computing special mathematical functions including spherical Bessel functions of complex argument and performing large complex matrix manipulations on floating point numbers of arbitrarily high precision. The essential acoustic field quantities such as the modal acoustic radiation impedance load on the source, the radiated far-field pressure directivity pattern and the radiated on-axis pressure are evaluated and discussed for representative values of the parameters characterizing the system. Limiting cases are examined and excellent agreements with well known solutions are attained.

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Sound radiation from a liquid-filled underwater spherical acoustic lens with an internal eccentric baffled spherical piston

Hasheminejad

Azarpeyvand

2004

Ocean Engineering

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Harmonic radiation from a liquid-filled spherical acoustic lens with an internal eccentric spherical source

Cited by 3 publications

References 20 publications

Acoustic radiation force of elastic spherical shell with eccentric droplet in plane wave acoustic field

Acoustic radiation force of elastic spherical shell with eccentric droplet in plane wave acoustic field

Computation of Acoustic Field Radiated by a Spherical Source Near a Thermoviscous Fluid Sphere

Sound radiation from a liquid-filled underwater spherical acoustic lens with an internal eccentric baffled spherical piston

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