Selective particle separation on centimeter scale using a dual frequency dynamic acoustic field

M H Kandemir; R M Wagterveld; D R Yntema; K J Keesman

doi:10.1016/j.ultras.2021.106411

Selective particle separation on centimeter scale using a dual frequency dynamic acoustic field

Ultrasonics. 2021 Jul:114:106411. doi: 10.1016/j.ultras.2021.106411. Epub 2021 Mar 4.

Authors

M H Kandemir¹, R M Wagterveld², D R Yntema², K J Keesman³

Affiliations

¹ Wageningen University & Research, Mathematical and Statistical Methods - Biometris, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands; Wetsus, European Center of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA Leeuwarden, the Netherlands.
² Wetsus, European Center of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA Leeuwarden, the Netherlands.
³ Wageningen University & Research, Mathematical and Statistical Methods - Biometris, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands; Wetsus, European Center of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA Leeuwarden, the Netherlands. Electronic address: karel.keesman@wur.nl.

PMID: 33730595
DOI: 10.1016/j.ultras.2021.106411

Abstract

This study investigated the application of dual-frequency type dynamic acoustic fields for size-selective particle separation on centimeter scale in a continuous flow. The 3D-printed X-shaped prototype has two inlets and two outlets. The dynamic acoustic field is generated by two transducers positioned under an angle of 60^° and operating at slightly different frequencies. The acoustic reflections are eliminated by placing sound-absorbing material inside the prototype and the non-resonant operation is confirmed by the electrical admittance measurements. Numerical calculations suggested that pressure generated by each transducer does not need to have equal amplitude. Computer simulations and lab experiments were carried out for different frequency differences and flow rates. The results demonstrated the ability of dual-frequency dynamic acoustic fields for size-selective particle filtration on centimeter scale, with a total flow rate up to.1Lh^-1.

Keywords: Acoustophoresis; Counter propagating waves; Dynamic acoustic fields; Selective particle separation.