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Abstract

Results of velocity measurements of liquid and gas bubbles in a tank with a self-aspirating disk impeller are analysed. Studies were carried out using a fluorescent dye tracer in the measuring system with two cameras (simultaneous phase velocity measurement) and with one camera (sequential measurement of phase velocity). Based on a comparative analysis of the acquired data it was found that when differences in the phase velocities were small the simultaneous velocity measurement gave good results. However, sequential measurement gives greater possibilities for setting the measuring system and if the analysis of instantaneous velocities is not necessary, it seems to be a better solution.

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Authors and Affiliations

Radosław Musoski
Jacek Stelmach
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Abstract

This paper presents theory of new shear horizontal (SH) acoustic surface waves that propagate along the interface of two semi-infinite elastic half-spaces, one of which is a conventional elastic medium and a second one an elastic metamaterial with a negative and frequency dependent shear elastic compliance.
This new surface waves have only one transverse component of mechanical displacement, which has a maximum at the interface and decays exponentially with distance from the interface. Similar features are also shown by the acoustic shear horizontal Maerfeld-Tournois surface waves propagating at the interface of two semi-infinite elastic media due to the piezoelectric effect that should occur in at least one semi-space.
The proposed new shear horizontal acoustic surface waves exhibit also strong formal similarities with the electromagnetic surface waves of the surface plasmon polariton (SPP) type, propagating along a metal-dielectric planar interface. In fact, the new shear horizontal elastic surface waves possess a large number of properties that are inherent for the SPP electromagnetic surface waves, such as strong subwavelength concentration of the wave field in the proximity of the guiding interface, low phase and group velocity etc. As a result, the new shear horizontal acoustic surface waves can find applications in sensors with extremely high sensitivity, employed in measurements of various physical parameters, such as viscosity of liquids, as well as in biosensors, chemosensors, or a near field acoustic microscopy (subwavelength imaging) and miniaturized devices of microwave acoustics.
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Bibliography

Achenbach J.D. (1973), Wave Propagation in Elastic Solids, North-Holland, Amsterdam.

Ambati M., Fang N., Sun C., Zhang X. (2007), Surface resonant states and superlensing in acoustic metamaterials, Physical Review B, 75(19): 195447, https://doi.org/10.1103/PhysRevB.75.195447.

Auld B.A. (1990), Acoustic Fields and Waves in Solids. Volume I, II, Krieger Publishing Company, Florida.

Bleustein J.L. (1968), A new surface wave in piezoelectric materials, Applied Physics Letters, 13: 412-413, 10.1063/1.1652495. https://doi.org/10.1063/1.1652495.

Born M., Wolf E. (1980), Principles of Optic, 6th ed., p. 625, Cambridge University Press, Cambridge.

Deng K., He Z., Ding Y., Zhao H., Liu Z. (2014), Surface-plasmon-polariton (SPP)-like acoustic surface waves on elastic metamaterials, arXiv, arXiv:1408.2186v1, 10.48550/arXiv.1408.2186, https://doi.org/10.48550/arXiv.1408.2186.

Kadic M., Bückmann T., Schittny R., Wegener M. (2013), Metamaterials beyond electromagnetism, Reports on Progress in Physics, 76(12): 126501, https://doi.org/10.1088/0034-4885/76/12/126501.

Kiełczyński P., Szalewski M., Balcerzak A., Wieja K. (2015), Group and Phase Velocity of Love Waves Propagating in Elastic Functionally Graded Materials, Archives of Acoustics, 40(2): 273–281, https://doi.org/10.1515/aoa-2015-0030.

Kiełczyński P. (2018), Direct Sturm–Liouville problem for surface Love waves propagating in layered viscoelastic waveguides, Applied Mathematical Modelling, 53: 419–432, 10.1016/j.apm.2017.09.013. https://doi.org/10.1016/j.apm.2017.09.013.

Kiełczyński P. (2021), New Fascinating Properties and Potential Applications of Love Surface Waves, Invited Speaker presentation at the IEEE, International Ultrasonic Symposium, September 11–16, 2021, Xi’an, China, http://zbae.ippt.pan.pl/strony/publikacje.htm.

Love A.E.H. (1911), Some Problems of Geodynamics, Cambridge University Press, London.

Maerfeld C., Tournois P. (1971), Pure shear elastic surface wave guided by the interface of two semi‐infinite media, Applied Physics Letters, 19(4): 117, 10.1063/1.1653836. https://doi.org/10.1063/1.1653836.

Maier S.A. (2007), Plasmonics: Fundamentals and Applications, Springer, Berlin.

Nkoma J., Loudon R., Tilley D.R. (1974), Elementary properties of surface polaritons, Journal of Physics C: Solid State Physics, 7(19): 3547–3559.

Rosenblatt G., Feigenbaum E., Orenstein M. (2010), Circular motion of electromagnetic power shaping the dispersion of surface plasmon polaritons, Optics Express, 18(25): 25861–25872, 10.1364/OE.18.025861. https://doi.org/10.1364/OE.18.025861.

Royer D., Dieulesaint E. (2000), Elastic Waves in Solids I, Springer, Berlin Heidelberg New York.

Wu Y., Lai Y., Zhang Z.-Q. (2011), Elastic metamaterials with simultaneously negative effective shear modulus and mass density, Physical Review Letters, 107(10): 105506, 10.1103/PhysRevLett.107.105506. https://doi.org/10.1103/PhysRevLett.107.105506.

Yu S.-Y., Wang J.-Q., Sun X.-C., Liu F.-K., He C., Xu H.-H., Lu M.-H., Christensen J., Liu X.-P., Chen Y.-F. (2020), slow surface acoustic waves via lattice optimization of a phononic crystal on a chip, Physical Review Applied, 14(6): 064008, 10.1103/PhysRevApplied.14.064008. https://doi.org/10.1103/PhysRevApplied.14.064008.

Zaccherini R., Colombi A., Palermo A., Dertimanis V.K., Marzani A., Thomsen H.R., Stojadinovic B., Chatzi E.N. (2020), Locally resonant metasurfaces for shear waves in granular media, Physical Review Applied, 13(3): 034055, 10.1103/PhysRevApplied.13.034055, https://doi.org/10.1103/PhysRevApplied.13.034055.

Zhang J., Zhang L., Xu W. (2020), Surface plasmon polaritons: physics and applications, Journal of Physics D: Applied Physics, 45(11): 113001.


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Authors and Affiliations

Piotr Kiełczyński
1

  1. Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland
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Abstract

This paper presents a theoretical study of the propagation behaviour of surface Love waves in nonhomogeneous functionally graded elastic materials, which is a vital problem in acoustics. The elastic properties (shear modulus) of a semi-infinite elastic half-space vary monotonically with the depth (distance from the surface of the material). Two Love wave waveguide structures are analyzed: 1) a nonhomogeneous elastic surface layer deposited on a homogeneous elastic substrate, and 2) a semi-infinite nonhomogeneous elastic half-space. The Direct Sturm-Liouville Problem that describes the propagation of Love waves in nonhomogeneous elastic functionally graded materials is formulated and solved 1) analytically in the case of the step profile, exponential profile and 1cosh2 type profile, and 2) numerically in the case of the power type profiles (i.e. linear and quadratic), by using two numerical methods: i.e. a) Finite Difference Method, and b) Haskell-Thompson Transfer Matrix Method. The dispersion curves of phase and group velocity of surface Love waves in inhomogeneous elastic graded materials are evaluated. The integral formula for the group velocity of Love waves in nonhomogeneous elastic graded materials has been established. The results obtained in this paper can give a deeper insight into the nature of Love waves propagation in elastic nonhomogeneous functionally graded materials.
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Authors and Affiliations

Piotr Kiełczyński
Marek Szalewski
Andrzej Balcerzak
Krzysztof Wieja

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