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Influence of the acoustic entrainment on aerosol particle interactions: experimental balance of the hydrodynamic mechanisms

AutorGonzález Gómez, Icíar; Gallego Juárez, Juan Antonio; Riera, Enrique
Palabras claveParticle interactions
Acoustic agglomeration
Acoustic wake effect
Acoustic entrainments
hydrodynamic mechanisms
Fecha de publicaciónsep-2002
EditorSociedad Española de Acústica
CitaciónForum Acusticum Sevilla 2002. Physical Acoustics ; PHA-01-001
ResumenA new experimental micro-scale study of particle interactions acoustically induced in monodisperse aerosols is presented in this work. It is devoted to the study of the influence exerted by the acoustic entrainment experienced by the single particles on their attraction processes and, in particular, on the hydrodynamic mechanisms that govern them. Glass spheres with certified diameters of 8.0 ± 0.9 μm immersed in air as dilute aerosols were subjected to homogeneous plane standing waves with a constant velocity amplitude U0 = 0.44 m/s at diverse frequencies, ranging from 200 Hz up to 5 kHz, at which the particles were much smaller than the respective acoustic wave-lengths.
The experiments were carried out in the viscous forces domain with respect to the inertial forces, at a constant Reynolds number Re=0.24, in an emerging Oseen regime with very weak asymmetries in the flow field. For the first time this paper presents a complete collection of particle interactions at acoustic entrainments varying from qp=0.84 to qp =0.05, i.e., covering practically its complete range of variability.
It is experimentally confirmed for the first time the presence of the mutual radiation pressure as a disturbing effect on the acoustic agglomeration generated on the aerosols, that is produced by the acoustic wake effect. Our results coincide with other previous researchs, agreeing with the theoretical prediction.
Descripción6 pages, 5 figures.-- PACS nrs.: 43.25.Uv, 43.25.Nm.-- Communication presented at: Forum Acusticum Sevilla 2002 (Sevilla, Spain, 16-20 Sep 2002), comprising: 3rd European Congress on Acoustics; XXXIII Spanish Congress on Acoustics (TecniAcústica 2002); European and Japanese Symposium on Acoustics; 3rd Iberian Congress on Acoustics.-- Special issue of the journal Revista de Acústica, Vol. XXXIII, year 2002.
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