Por favor, use este identificador para citar o enlazar este ítem:
http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/83| Acoustic rotational streaming and angular momentum transfer to matter driven by ultrasonic acoustic vortices | |
| JUAN ISRAEL VÁZQUEZ LOZANO | |
| RUBEN RAMOS GARCIA | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| Momentum Acoustics Vortices Rotational flow Flux flow | |
| Mechanical effects of waves on material media is a powerful option to achieve contactless manipulation in a controlled manner, which has already found numerous applications in optics and acoustics. A basic example consists of absorption-mediated wave-matter exchange of linear and/or angular momentum that light or sound may carry. To date, the demonstration of all kinds of exchanges mediated by dissipative processes have been carried out experimentally. Moreover, nondissipative exchanges of linear and angular momentum between waves and matter are also possible. Furthermore, recent works have observed indirectly that acoustic vortices impart momentum to a fluid unveiling a rotational flow of the liquid. This rotational flow is the counterpart of the classical acoustic streaming, which is the linear motion along the beam propagation direction that results from momentum transfer due to thermoviscous dissipations induced sound absorption. This rotational flow induced by the radiation torque exerted on the sound absorbing fluid through which the acoustic beam propagates, circulates around the propagation direction of the acoustic vortex. First we report on orbital angular momentum exchange between sound and matter mediated by a non-dissipative chiral scattering process. The experimental demonstration is made by irradiating a three-dimensional printed, spiral-shaped chiral object using an incident ultrasonic beam carrying zero orbital angular momentum. This is the acoustic analog of an optical spiral phase plate (SPP) but for sound waves. Chiral refraction is shown to impart a nonzero orbital angular momentum to the scattered field and to rotate the object. This result constitutes a proof-of-concept of a novel kind of acoustic angular manipulation of matter. After that, we report the first direct experimental demonstration of acoustic rotational streaming as result of the exchange of momentum between an acoustic vortex and fluid with PMMA particles used as tracers of the flow. It is shown that the system behaves as a Fabry –Pérot like cavity for acoustic waves. Experimental results and observations are sustained by a small model developed for the system providing a first approach to this phenomenon. | |
| Instituto Nacional de Astrofísica Óptica y Electrónica | |
| 2015-08 | |
| Tesis de maestría | |
| Inglés | |
| Público en general | |
| Vazquez-Lozano J.I. | |
| ÓPTICA | |
| Aparece en las colecciones: | Maestría en Óptica |
Cargar archivos:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| VazquezLJI.pdf | 2.14 MB | Adobe PDF | Visualizar/Abrir |